selected publications
-
chapter
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LC-TOF-MS for the Identification of Environmental Metabolites and Degradation Products.
Comprehensive Analytical Chemistry.
231-261.
2016
- Occurrence of Transformation Products of Emerging Contaminants in Water Resources of the United States. 751-773. 2014
- A Decade of Measuring, Monitoring, and Studying the Fate and Transport of Triazine Herbicides and their Degradation Products in Groundwater, Surface Water, Reservoirs, and Precipitation by the US Geological Survey. 451-475. 2008
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LC-MS. I: Basic principles and technical aspects of LC-MS for pesticide analysis.
Comprehensive Analytical Chemistry.
369-401.
2005
-
LC-TOF-MS for the Identification of Environmental Metabolites and Degradation Products.
Comprehensive Analytical Chemistry.
231-261.
2016
-
conference proceeding
- Developing and improving accurate mass tools for the analysis of unknowns in surface and groundwater samples. ACS National Meeting Book of Abstracts. 2018
- Discovery of proprietary amino ethoxylates in hydraulic fracturing wastewater using LC/Q-TOF/MS with solid phase extraction. ACS National Meeting Book of Abstracts. 2018
- Biodegradation of organic additives and hydrocarbons from flowback water of the Denver-Julesburg Basin: A laboratory study of shallow groundwater conditions. ACS National Meeting Book of Abstracts. 2017
- Characterization of a hydraulically fractured well over a one year period: From fracturing fluid to produced water quality. ACS National Meeting Book of Abstracts. 2017
- Ion mobility mass spectrometry of hydraulic-fracturing fluids. ACS National Meeting Book of Abstracts. 2017
- Isolation of Dissolved Organic Matter (DOM) with XAD resins: Early studies. ACS National Meeting Book of Abstracts. 2017
- Isolation, analysis, and fingerprinting of organic compounds from hydraulic fracturing fluids using solid phase extraction and liquid chromatography mass spectrometry. ACS National Meeting Book of Abstracts. 2017
- LC/Q-TOF-MS for the identification of environmental metabolites and degradation products. ACS National Meeting Book of Abstracts. 2017
- NDMA precursor transformation and identification during reverse osmosis and UV/peroxide water treatment for indirect potable reuse. ACS National Meeting Book of Abstracts. 2017
- Polypropylene glycol surfactants and their degradation products as potential indicator compounds for shallow groundwater impacted by hydraulic fracturing fluids. ACS National Meeting Book of Abstracts. 2017
- Using dark matter accurate mass to discover NDMA precursors in wastewater. ACS National Meeting Book of Abstracts. 2017
- Utilization of soft and hard ionization techniques with 2-dimensional gas chromatography and high-resolution mass spectrometry for unknown identification in hydraulic fracturing fluid, flowback and produced water samples. ACS National Meeting Book of Abstracts. 2017
- Characterization and treatment of hydraulic fracturing wastewater over time from northeast Colorado. ACS National Meeting Book of Abstracts. 2016
- Analysis of hydraulic fracturing flowback and produced waters using accurate mass: IIdentification of ethoxylated surfactants. ACS National Meeting Book of Abstracts. 2015
- How stable are hydraulic fracturing fluid chemicals deep below the Earth's surface?. ACS National Meeting Book of Abstracts. 2015
- Solid phase extraction of organic matter, past to present: A review of isolation mechanisms from XAD to today's sorbents. ACS National Meeting Book of Abstracts. 2015
- "Classic Papers" on Aquatic Humic Substances: Use of the Hirsch Index. ACS Symposium Series. 7-25. 2013
- Aquatic humic substances: A short history through the lens of the Hirsch factor. ACS National Meeting Book of Abstracts. 2013
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Feasibility of LC/TOFMS and elemental database searching as a spectral library for pesticides in food.
Food Additives and Contaminants.
1169-1178.
2005
- Decade of monitoring and studying the fate and transport of triazine herbicides in ground water and surface water.. ACS National Meeting Book of Abstracts. U75-U75. 2005
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Discovering metabolites of post-harvest fungicides in citrus with liquid chromatography/time-of-flight mass spectrometry and ion trap tandem mass spectrometry.
Journal of Chromatography A.
71-80.
2004
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Multi-residue pesticide analysis in fruits and vegetables by liquid chromatography-time-of-flight mass spectrometry.
Journal of Chromatography A.
81-90.
2004
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Herbicide and degradate flux in the Yazoo River Basin.
International Journal of Environmental Analytical Chemistry.
1127-1140.
2004
- Comparison of quad rupole-time-of-flight (Q-tof), triple quadrupole, and ion-trap mass spectrometry/mass spectrometry (MS/MS) for the analysis of unknown pesticides and pharmaceuticals in water.. ACS National Meeting Book of Abstracts. U510-U510. 2002
- Analysis of emerging contaminants. ACS Symposium Series. 2-13. 2002
- Comparison of quadrupole time-of-flight, triple quadrupole, and ion-trap mass spectrometry/mass spectrometry for the analysis of emerging contaminants. ACS Symposium Series. 14-31. 2002
- Identification of homologue unknowns in wastewater by ion trap MSn: The diagnostic-ion approach. ACS Symposium Series. 376-393. 2002
- Identification of labile polar organic contaminants by atmospheric-pressure ionization tandem mass spectrometry. ACS Symposium Series. 175-187. 2002
- Identification of trifluralin metabolites in soil using ion-trap LC/MS/MS. ACS Symposium Series. 291-310. 2002
- TOF-MS and quadrupole ion-trap MS/MS for the discovery of herbicide degradates in groundwater. ACS Symposium Series. 128-144. 2002
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Accurate mass analysis of ethanesulfonic acid degradates of acetochlor and alachlor using high-performance liquid chromatography and time-of-flight mass spectrometry.
Journal of Chromatography A.
3-9.
2001
- Detection of glyphosate in water using an affinity-enhanced enzyme-linked immunosorbent assay.. ACS National Meeting Book of Abstracts. U55-U55. 2001
- Solid phase extraction of sub-microgram-per-liter concentrations of sulfonamides and tetracyclines from water.. ACS National Meeting Book of Abstracts. U619-U619. 2001
- Using reverse-phase solid-phase extraction for isolation of pesticide degradates.. ACS National Meeting Book of Abstracts. U614-U615. 2001
- Extraction of antibiotics from agricultural wastewater.. ACS National Meeting Book of Abstracts. U26-U27. 2000
- Determination of organophosphorus pesticides in water samples using solid-phase extraction and gas chromatography/mass spectrometry.. ACS National Meeting Book of Abstracts. U655-U655. 2000
- First analysis and detection of the herbicide dimethenamid and its ESA metabolite in water.. ACS National Meeting Book of Abstracts. U76-U77. 2000
- Determination of ionic chloroacetanalide herbicide metabolites in surface water and groundwater by high-performance liquid chromatography-diode array detection and high-performance liquid chromatography/mass spectrometry.. ACS National Meeting Book of Abstracts. U97-U97. 1999
- Occurrence of acetochlor and acetochlor-metabolites in alluvial aquifers in Iowa.. ACS National Meeting Book of Abstracts. U97-U97. 1999
- Natural attenuation of chloroacetinilide herbicides in aquatic systems. 283-288. 1999
- Occurrence of acetanilide herbicide metabolites in ground water of the Midwest.. ACS National Meeting Book of Abstracts. U133-U134. 1998
- The relative attenuation factor (Ar): A new conceptual technique for comparing regional water-quality data in the Mississippi River Basin, USA. ACS National Meeting Book of Abstracts. U34-U34. 1998
- Evaluation of immunoassay for determination of pesticide concentrations at a large-scale ground-water contamination site. ACS National Meeting Book of Abstracts. 39-ENVR. 1996
- Extraction of hydroxylated atrazine degradation products from soil by cation exchange.. ACS National Meeting Book of Abstracts. 68-AGRO. 1996
- Integration immunoassay with conventional methods in the study of the fate and transport of herbicides in soil. ACS National Meeting Book of Abstracts. 13-ENVR. 1996
- Occurrence of deethylatrazine and deisopropylatrazine in surface and ground water. ACS National Meeting Book of Abstracts. 144-AGRO. 1996
- Triazine herbicides in the hydrologic cycle in the Mississippi River basin. ACS National Meeting Book of Abstracts. 143-AGRO. 1996
- Use of enzyme immunoassay for large water-quality surveys of major herbicides.. ACS National Meeting Book of Abstracts. 4-ENVR. 1996
- Effects of hydrophyte community structure on atrazine and alachlor degradation in wetlands. 525-538. 1995
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The deethylatrazine/atrazine ratio as an indicator of the onset of the spring flush of herbicides into surface water of the Midwestern United States.
International Journal of Environmental Analytical Chemistry.
203-214.
1995
- CHEMISTRY AND SOURCES OF NATURAL AQUATIC FOAM. ACS National Meeting Book of Abstracts. 15-IEC. 1995
- Organic geochemistry and sources of natural aquatic foams. ACS Symposium Series. 151-192. 1995
- A first application of enzyme-linked immunosorbent assay for screening cyclodiene insecticides in ground water. ACS Symposium Series. 148-154. 1995
- An evaluation of a microtiter-plate enzyme-linked immunosorbent assay method for the analysis of triazine and chloroacetanilide herbicides in storm runoff samples. ACS Symposium Series. 170-182. 1995
- ANALYSIS OF RIVER WATER FOR THE HERBICIDES 2,4-D AND DICAMBA BY SOLID-PHASE EXTRACTION, DERIVATIZATION, AND GAS-CHROMATOGRAPHY - MASS-SPECTROMETRY. ACS National Meeting Book of Abstracts. 13-ENVR. 1995
- CYANAZINE, ATRAZINE, AND THEIR METABOLITES AS GEOCHEMICAL INDICATORS OF CONTAMINANT TRANSPORT IN THE MISSISSIPPI RIVER. ACS National Meeting Book of Abstracts. 62-ENVR. 1995
- Cyanazine, atrazine, and their metabolites as geochemical indicators of contaminant transport in the Mississippi river. ACS Symposium Series. 288-303. 1995
- EVIDENCE FOR LONG-RANGE ATMOSPHERIC TRANSPORT AND DEGRADATION OF HERBICIDES. ACS National Meeting Book of Abstracts. 58-ENVR. 1995
- HERBICIDES AND METABOLITES IN SURFACE-WATER, RAINWATER, AND GROUND-WATER IN THE MIDWESTERN UNITED-STATES. ACS National Meeting Book of Abstracts. 56-ENVR. 1995
- Herbicide metabolites in surface water and groundwater: Introduction and overview. ACS Symposium Series. 1-15. 1995
- IDENTIFICATION OF A NEW METABOLITE OF METOLACHLOR IN SOIL - THE IMPORTANCE OF THE SULFONIC-ACID PATHWAY. ACS National Meeting Book of Abstracts. 28-ENVR. 1995
- MOVEMENT OF ATRAZINE, CYANAZINE, DEETHYLATRAZINE AND DEISOPROPYLATRAZINE IN SOIL. ACS National Meeting Book of Abstracts. 30-ENVR. 1995
- RELATION OF LANDSCAPE POSITION AND IRRIGATION TO CONCENTRATIONS OF ALACHLOR, ATRAZINE, AND SELECTED DEGRADATES IN REGOLITH IN NORTHEASTERN NEBRASKA. ACS National Meeting Book of Abstracts. 187-ENVR. 1995
- Relation of landscape position and irrigation to concentrations of alachlor, atrazine, and selected degradates in regolith in northeastern Nebraska. ACS Symposium Series. 178-197. 1995
- THE FATE AND DEGRADATION OF CYANAZINE IN WETLANDS. ACS National Meeting Book of Abstracts. 47-ENVR. 1995
- THE TRANSPORT OF CYANAZINE AND ATRAZINE METABOLITES IN THE UNSATURATED ZONE. ACS National Meeting Book of Abstracts. 61-ENVR. 1994
- AQUATIC HUMIC SURFACTANTS - A LABILE FRACTION OF DISSOLVED CARBON POOL. ACS National Meeting Book of Abstracts. 50-GEOC. 1994
- FRACTIONATION OF HUMIC MATERIAL IN TALL-GRASS PRAIRIE SOIL WATERS. ACS National Meeting Book of Abstracts. 48-GEOC. 1994
- NATURAL SURFACTANTS AND THE CHEMISTRY OF NATURAL AQUATIC FOAMS. ACS National Meeting Book of Abstracts. 51-GEOL. 1994
- OCCURRENCE AND TRANSPORT OF HERBICIDES IN THE MISSISSIPPI RIVER DURING THE 1993 FLOOD. ACS National Meeting Book of Abstracts. 131-AGRO. 1994
- OCCURRENCE OF ALACHLOR AND ITS ETHANESULFONIC ACID METABOLITE IN RESERVOIRS. ACS National Meeting Book of Abstracts. 127-AGRO. 1994
- PART-PER-TRILLION ANALYSIS OF ATRAZINE IN SOIL USING IMMUNOASSAY. ACS National Meeting Book of Abstracts. 92-AGRO. 1994
- TEMPORAL AND GEOGRAPHIC DISTRIBUTION OF HERBICIDES IN PRECIPITATION IN THE MIDWEST AND NORTHEAST UNITED-STATES, 1990-1991. 697-710. 1993
- CHEMISTRY OF AQUATIC HUMIC SURFACTANTS - CHARACTERIZATION AND POSSIBLE ROLE IN ENHANCED DEGRADATION OF HERBICIDES. 769-774. 1992
- HERBICIDES AND NITRATE IN STORM RUNOFF FROM WATERSHEDS IN THE MIDWESTERN UNITED-STATES. ACS National Meeting Book of Abstracts. 123-AGRO. 1992
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APPLICATION OF MIXED-MODE, SOLID-PHASE EXTRACTION IN ENVIRONMENTAL AND CLINICAL-CHEMISTRY - COMBINING HYDROGEN-BONDING, CATION-EXCHANGE AND VANDERWAALS INTERACTIONS.
Journal of Chromatography A.
11-21.
1992
-
AUTOMATED SOLID-PHASE EXTRACTION OF HERBICIDES FROM WATER FOR GAS-CHROMATOGRAPHIC MASS-SPECTROMETRIC ANALYSIS.
Journal of Chromatography A.
55-59.
1992
- AUTOMATED SOLID-PHASE EXTRACTION OF HERBICIDES FROM WATER FOR GC/MS ANALYSIS. ACS National Meeting Book of Abstracts. 78-ENVR. 1992
- MAPPING THE REGIONAL OCCURRENCE OF HERBICIDES IN SURFACE-WATER OF THE MIDWESTERN UNITED-STATES BY IMMUNOASSAY AND GC/MS. ACS National Meeting Book of Abstracts. 257-ENVR. 1992
- MIXED-MODE ISOLATION AND PURIFICATION OF TRIAZINE HERBICIDES FROM ORGANIC AND AQUEOUS-SOLUTIONS. ACS National Meeting Book of Abstracts. 12-ENVR. 1992
- MIXED-MODE SOLID-PHASE EXTRACTION - SIMULATING INTERACTIONS WITH 3-D MOLECULAR-MODELING SOFTWARE. ACS National Meeting Book of Abstracts. 13-ENVR. 1992
- PART-PER-TRILLION ANALYSIS OF ATRAZINE IN PRISTINE WATER - A METHOD FOR COUPLING SOLID-PHASE EXTRACTION AND IMMUNOASSAY. ACS National Meeting Book of Abstracts. 172-AGRO. 1992
- CHARACTERIZATION OF SELF-ASSEMBLED MONOLAYERS OF GENETICALLY ENGINEERED CYTOCHROME-B5. 163-170. 1991
- HERBICIDES IN STREAMS - MIDWESTERN UNITED-STATES. Irrigation and Drainage. 17-23. 1991
- SOURCE OF ATRAZINE AND DESETHYLATRAZINE IN A RIVER, DURING BASE-FLOW. Irrigation and Drainage. 253-259. 1991
- HERBICIDES IN ATMOSPHERIC WET DEPOSITION IN THE UPPER MIDWEST AND NORTHEAST UNITED-STATES. ACS National Meeting Book of Abstracts. 17-AGRO. 1991
- STRUCTURAL COMPONENTS AND PROPOSED STRUCTURAL MODELS OF FULVIC-ACID FROM THE SUWANNEE RIVER. ACS National Meeting Book of Abstracts. 48-GEOC. 1990
- OCCURRENCE AND TREATMENT OF ATRAZINE AND ITS DEGRADATION PRODUCTS IN DRINKING-WATER. 871-894. 1990
- COLLECTING AND CONCENTRATING LARGE SUSPENDED SEDIMENT SAMPLES FOR ORGANIC CONTAMINANT ANALYSIS. ACS National Meeting Book of Abstracts. 103-ENVR. 1990
- IMMUNOASSAY AS A SCREENING TOOL FOR TRIAZINE HERBICIDES IN STREAMS - COMPARISON WITH GAS-CHROMATOGRAPHIC MASS-SPECTROMETRIC METHODS. 86-99. 1989
- FIELD COMPARISON OF PURGE AND TRAP GAS-CHROMATOGRAPHY MASS-SPECTROMETRY, PURGABLE ORGANIC CHLORINE, AND TOTAL ORGANIC-CARBON ANALYSIS FOR MONITORING VOLATILE CHLORINATED HYDROCARBONS IN GROUND-WATER. ACS National Meeting Book of Abstracts. 99-ENVR. 1989
- WHAT IS THE COMPOSITION OF ORGANIC-ACIDS IN AQUATIC SYSTEMS AND HOW ARE THEY CHARACTERIZED. 75-95. 1989
- HERBICIDES IN GROUND AND SURFACE-WATER IN THE MIDCONTINENTAL UNITED-STATES - A RESEARCH PLAN. 55-67. 1988
- TRACE ORGANIC-COMPOUNDS IN GROUND-WATER IN SOUTH-CENTRAL KANSAS AS INFERRED FROM GAS-CHROMATOGRAPHY WITH FLAME-IONIZATION DETECTION. ACS National Meeting Book of Abstracts. 4-ENVR. 1988
- LINEAR ALKYLBENZENE SULFONATES IN GROUNDWATER - POTENTIAL FOR CO-ISOLATION WITH HUMIC SUBSTANCES. ACS National Meeting Book of Abstracts. 74-ENVR. 1987
- AN INVESTIGATION OF HUMIC SUBSTANCES BY PY-MS PATTERN-RECOGNITION. ACS National Meeting Book of Abstracts. 48-GEOC. 1983
- HUMIC SUBSTANCES IN GROUNDWATER. ACS National Meeting Book of Abstracts. 89-ENVR. 1983
- NATURE AND SOURCE OF HUMIC SUBSTANCES ISOLATED FROM SURFACE WATERS. ACS National Meeting Book of Abstracts. 7-GEOC. 1981
- OCCURRENCE OF FULVIC AND HUMIC ACIDS IN UNCONTAMINATED GROUND WATERS. ACS National Meeting Book of Abstracts. 6-GEOC. 1981
- CONSIDERATIONS RELEVANT TO THE USE OF XAD RESINS IN CONCENTRATING ORGANICS FOR TOXICITY STUDIES. ACS National Meeting Book of Abstracts. 40-ENVR. 1980
- ENZACRYL GEL CHROMATOGRAPHY OF AQUEOUS HUMIC SUBSTANCES. ACS National Meeting Book of Abstracts. 21-21. 1979
- HYDROPHILIC ORGANIC SOLUTES AS TRACERS IN GROUNDWATER RECHARGE STUDIES. ACS National Meeting Book of Abstracts. 8-8. 1979
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journal article
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Occurrence of Benzene Polycarboxylic Acids in Ash and Streamwater after the Cameron Peak Fire.
3848-3857.
2023
-
Comparison of Oxidants Used in Advanced Oxidation for Potable Reuse: Non-Target Analysis and Bioassays.
690-700.
2023
-
Non-target mass spectrometry analysis of NDMA precursors in advanced treatment for potable reuse (vol 4, pg 1944, 2018).
Environmental Science: Water Research & Technology.
686-686.
2022
-
Wildfires: Identification of a new suite of aromatic polycarboxylic acids in ash and surface water.
Science of the Total Environment.
2021
-
Sustainable microalgae-based technology for biotransformation of benzalkonium chloride in oil and gas produced water: A laboratory-scale study.
Science of the Total Environment.
2020
-
Desalting and Concentration of Common Hydraulic Fracturing Fluid Additives and their Metabolites with Solid-Phase Extraction.
Journal of Chromatography A.
2020
-
Nontargeted Screening of Water Samples Using Data-Dependent Acquisition with Similar Partition Searching.
Journal of the American Society for Mass Spectrometry.
1189-1204.
2020
-
Molecular Identification of Water-Extractable Organic Carbon from Thermally Heated Soils: C-13 NMR and Accurate Mass Analyses Find Benzene and Pyridine Carboxylic Acids.
Environmental Science and Technology (Washington).
2994-3001.
2020
-
Identification of opioids in surface and wastewaters by LC/QTOF-MS using retrospective data analysis.
Science of the Total Environment.
874-884.
2019
-
Degradation of polyethylene glycols and polypropylene glycols in microcosms simulating a spill of produced water in shallow groundwater.
Environmental Science Processes and Impacts.
256-268.
2019
-
Non-target mass spectrometry analysis of NDMA precursors in advanced treatment for potable reuse.
Environmental Science: Water Research & Technology.
1944-1955.
2018
-
Opioid occurrence in environmental water samples-A review.
Trends in Environmental Analytical Chemistry.
2018
-
Identification of Proprietary Amino Ethoxylates in Hydraulic Fracturing Wastewater Using Liquid Chromatography/Time-of-Flight Mass Spectrometry with Solid-Phase Extraction.
Analytical Chemistry.
10927-10934.
2018
-
Organic Chemical Characterization and Mass Balance of a Hydraulically Fractured Well: From Fracturing Fluid to Produced Water over 405 Days.
Environmental Science and Technology (Washington).
14006-14015.
2017
- UHPLC Coupled with Accurate Mass and High Resolution Mass Spectrometry for Complex Environmental Analyses. LC GC Europe. 243-244. 2017
-
Identification of polypropylene glycols and polyethylene glycol carboxylates in flowback and produced water from hydraulic fracturing.
Journal of Hazardous Materials.
11-17.
2017
-
LC/QTOF-MS fragmentation of N-nitrosodimethylamine precursors in drinking water supplies is predictable and aids their identification.
Journal of Hazardous Materials.
18-25.
2017
-
Hydraulic fracturing wastewater treatment by coagulation-adsorption for removal of organic compounds and turbidity.
Journal of Environmental Chemical Engineering.
1978-1984.
2016
-
Identification of polypropylene glycols and polyethylene glycol carboxylates in wastewater from hydraulic fracturing.
Journal of Hazardous Materials.
2016
-
Identification of Novel Perfluoroalkyl Ether Carboxylic Acids (PFECAs) and Sulfonic Acids (PFESAs) in Natural Waters Using Accurate Mass Time-of-Flight Mass Spectrometry (TOFMS).
Environmental Science and Technology (Washington).
11622-11630.
2015
-
Analysis of hydraulic fracturing additives by LC/Q-TOF-MS.
Analytical and Bioanalytical Chemistry.
6417-6428.
2015
-
Methadone Contributes to N-Nitrosodimethylamine Formation in Surface Waters and Wastewaters during Chloramination.
Environmental Science and Technology Letters.
151-157.
2015
-
Characterization of hydraulic fracturing flowback water in Colorado: Implications for water treatment.
Science of the Total Environment.
637-644.
2015
-
Chemical constituents and analytical approaches for hydraulic fracturing waters.
Trends in Environmental Analytical Chemistry.
18-25.
2015
-
Degradation pathways of lamotrigine under advanced treatment by direct UV photolysis, hydroxyl radicals, and ozone.
Chemosphere.
316-323.
2014
-
Identification of Prometon, Deisopropylprometon, and Hydroxyprometon in Groundwater by High Resolution Liquid Chromatography/Mass Spectrometry.
Science of the Total Environment.
459-466.
2014
-
Analysis of Hydraulic Fracturing Flowback and Produced Waters Using Accurate Mass: Identification of Ethoxylated Surfactants.
Analytical Chemistry.
9653-9661.
2014
-
Demonstrating sucralose as a monitor of full-scale UV/AOP treatment of trace organic compounds.
Journal of Hazardous Materials.
104-110.
2014
-
Determination of COREXIT components used in the Deepwater Horizon cleanup by liquid chromatography-ion trap mass spectrometry.
Analytical Methods: advancing methods and applications.
5498-5502.
2014
-
Dimer formation during UV photolysis of diclofenac.
Chemosphere.
1948-1956.
2013
-
Analytical Methodologies for the Detection of Sucralose in Water.
Analytical Chemistry.
9581-9587.
2013
-
Identification of imidacloprid metabolites in onion (Allium cepa L.) using high-resolution mass spectrometry and accurate mass tools.
Rapid Communications in Mass Spectrometry.
1891-1903.
2013
-
In-Stream Attenuation of Neuro-Active Pharmaceuticals and Their Metabolites.
Environmental Science and Technology (Washington).
9781-9790.
2013
-
Widespread occurrence of neuro-active pharmaceuticals and metabolites in 24 Minnesota rivers and wastewaters.
Science of the Total Environment.
519-527.
2013
-
Analysis of Isobaric Pesticides in Pepper with High-Resolution Liquid Chromatography and Mass Spectrometry: Complementary or Redundant?.
Journal of Agricultural and Food Chemistry.
2340-2347.
2013
-
Innovative determination of polar organophosphonate pesticides based on high-resolution Orbitrap mass spectrometry.
Journal of Mass Spectrometry.
1458-1465.
2012
-
Analysis of 100 pharmaceuticals and their degradates in water samples by liquid chromatography/quadrupole time-of-flight mass spectrometry.
Journal of Chromatography A.
148-157.
2012
-
Liquid chromatography/quadrupole-time-of-flight mass spectrometry with metabolic profiling of human urine as a tool for environmental analysis of dextromethorphan.
Journal of Chromatography A.
158-166.
2012
-
Identification of pesticide transformation products in agricultural soils using liquid chromatography/quadrupole-time-of-flight mass spectrometry.
Rapid Communications in Mass Spectrometry.
1091-1099.
2012
-
Methods for evaluating in-stream attenuation of trace organic compounds.
Applied Geochemistry.
S344-S345.
2011
-
LC/TOF-MS Analysis of Pesticides in Fruits and Vegetables: The Emerging Role of Accurate Mass in the Unambiguous Identification of Pesticides in Food.
Methods in Molecular Biology.
193-218.
2011
-
Identification of a New Antidepressant and its Glucuronide Metabolite in Water Samples Using Liquid Chromatography/Quadrupole Time-of-Flight Mass Spectrometry.
Analytical Chemistry.
8161-8168.
2010
-
Analysis of 70 Environmental Protection Agency priority pharmaceuticals in water by EPA Method 1694.
Journal of Chromatography A.
5674-5686.
2010
-
The isotopic mass defect: a tool for limiting molecular formulas by accurate mass.
Analytical and Bioanalytical Chemistry.
2807-2816.
2010
-
Analysis of sucralose and other sweeteners in water and beverage samples by liquid chromatography/time-of-flight mass spectrometry.
Journal of Chromatography A.
4127-4134.
2010
- Degradation and products of diclofenac during UV photolysis. ACS National Meeting Book of Abstracts. 2010
- Environmental Applications of a UHPLC System: The Evolution of Chromatography. American Laboratory: practical resources for laboratory scientists. 22-+. 2010
-
Gas chromatographic-mass spectrometric fragmentation study of phytoestrogens as their trimethylsilyl derivatives: Identification in soy milk and wastewater samples.
Journal of Chromatography A.
6024-6032.
2009
-
A national reconnaissance for pharmaceuticals and other organic wastewater contaminants in the United States - II) Untreated drinking water sources.
Science of the Total Environment.
201-216.
2008
-
Identification of photocatalytic degradation products of bezafibrate in TiO2 aqueous suspensions by liquid and gas chromatography.
Journal of Chromatography A.
38-48.
2008
-
Multi-residue method for the analysis of 101 pesticides and their degradates in food and water samples by liquid chromatography/time-of-flight mass spectrometry.
Journal of Chromatography A.
24-37.
2007
-
Importance of the electron mass in the calculations of exact mass by time-of-flight mass spectrometry.
Rapid Communications in Mass Spectrometry.
2538-2539.
2007
-
Screening and confirmation of 100 pesticides in food samples by liquid chromatography/tandem mass spectrometry.
Rapid Communications in Mass Spectrometry.
3869-3882.
2007
-
The even-electron rule in electrospray mass spectra of pesticides.
Rapid Communications in Mass Spectrometry.
3855-3868.
2007
-
"Does atrazine transform to propazine in aquatic sediments?" - Comment on "Biological and chemical transformations of atrazine in coastal aquatic sediments" by Kelly L. Smalling and C. Marjorie Aelion [Chemosphere 62 (2006) 188-196].
Chemosphere.
1440-1441.
2006
-
Accurate-mass identification of chlorinated and brominated products of 4-nonylphenol, nonylphenol dimers, and other endocrine disrupters.
Journal of Mass Spectrometry.
1287-1297.
2006
- High-resolution and accurate mass analysis of xenobiotics in food. Analytical Chemistry. 6702-6708. 2006
-
Analysis of herbicides in olive oil by liquid chromatography time-of-flight mass spectrometry.
Journal of Agricultural and Food Chemistry.
6493-6500.
2006
-
Urban contributions of glyphosate and its degradate AMPA to streams in the United States.
Science of the Total Environment.
191-197.
2006
-
Exact-mass library for pesticides using a molecular-feature database.
Rapid Communications in Mass Spectrometry.
3659-3668.
2006
-
Photo-fenton degradation of diclofenac:: Identification of main intermediates and degradation pathway.
Environmental Science and Technology (Washington).
8300-8306.
2005
-
Application of time-of-flight mass spectrometry to the analysis of phototransformation products of diclofenac in water under natural sunlight.
Journal of Mass Spectrometry.
908-915.
2005
-
Herbicides and degradates in shallow aquifers of Illinois: Spatial and temporal trends.
Journal of the American Water Resources Association.
537-547.
2005
-
Measuring the mass of an electron by LC/TOF-MS: A study of "twin ions".
Analytical Chemistry.
3394-3400.
2005
-
Quantitation and accurate mass analysis of pesticides in vegetables by LC/TOF-MS.
Analytical Chemistry.
2818-2825.
2005
-
Widespread detection of N,N-diethyl-m-toluamide in US streams:: Comparison with concentrations of pesticides, personal care products, and other organic wastewater compounds.
Environmental Toxicology and Chemistry.
1029-1034.
2005
-
Determination of pesticide residues in olives and olive oil by matrix solid-phase dispersion followed by gas chromatography/mass spectrometry and liquid chromatography/tandem mass spectrometry.
Journal of Chromatography A.
183-194.
2005
-
Matching unknown empirical formulas to chemical structure using LC/MS TOF accurate mass and database searching: example of unknown pesticides on tomato skins.
Journal of Chromatography A.
127-134.
2005
-
Searching for non-target chlorinated pesticides in food by liquid chromatography/time-of-flight mass spectrometry.
Rapid Communications in Mass Spectrometry.
2780-2788.
2005
-
Degradates provide insight to spatial and temporal trends of herbicides in ground water.
Ground Water.
601-608.
2004
-
Herbicide concentrations in the Mississippi River Basin - the importance of chloroacetanilide herbicide degradates.
Science of the Total Environment.
189-199.
2004
-
Combination of LC/TOF-MS and LC/ion trap MS/MS for the identification of diphenhydramine in sediment samples.
Analytical Chemistry.
1437-1444.
2004
-
Intramolecular isobaric fragmentation: A curiosity of accurate mass analysis of sulfadimethoxine in pond water.
Analytical Chemistry.
1228-1235.
2004
-
Liquid chromatography/time-of-flight mass spectrometric analyses for the elucidation of the photodegradation products of triclosan in wastewater samples.
Rapid Communications in Mass Spectrometry.
443-450.
2004
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Liquid chromatography/time-of-flight/mass spectrometry (LC/TOF/MS) for the analysis of emerging contaminants.
Trends in Analytical Chemistry.
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2003
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Herbicides and transformation products in surface waters of the Midwestern United States.
Journal of the American Water Resources Association.
743-756.
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Changes in concentrations of triazine and acetamide herbicides by bank filtration, ozonation, and chlorination in a public water supply (vol 266, pg 190, 2002).
Journal of Hydrology.
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Herbicides and herbicide degradation products in upper Midwest agricultural streams during august base-flow conditions.
Journal of Environmental Quality.
1025-1035.
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Comment on "pharmaceuticals, hormones, and other organic wastewater contaminants in US streams, 1999-2000: A national reconnaissance".
Environmental Science and Technology (Washington).
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Response to comment on "pharmaceuticals, hormones, and other organic wastewater contaminants in US streams, 1999-2000: A national reconnaissance".
Environmental Science and Technology (Washington).
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River discharge measurements by using helicopter-mounted radar.
Geophysical Research Letters.
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- Movement of atrazine and deethylatrazine through a midwestern reservoir. Journal of the American Water Works Association. 54-66. 2002
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Determination of isoxaflutole (balance) and its metabolites in water using solid phase extraction followed by high-performance liquid chromatography with ultraviolet or mass spectrometry.
Journal of Agricultural and Food Chemistry.
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2002
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Linker-assisted immunoassay and liquid chromatography/mass spectrometry for the analysis of glyphosate.
Analytical Chemistry.
4937-4943.
2002
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Changes in concentrations of triazine and acetamide herbicides by bank filtration, ozonation, and chlorination in a public water supply.
Journal of Hydrology.
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Comment on "Pharmaceuticals, hormones, and other organic wastewater contaminants in US streams, 1999-2000: A national reconnaissance".
Environmental Science and Technology (Washington).
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Response to Comment on,"Pharmaceuticals, hormones, and other organic wastewater contaminants in US streams, 1999-2000: A national reconnaissance".
Environmental Science and Technology (Washington).
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2002
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Response to comment on "Pharmaceuticals, hormones, and other organic wastewater contaminants in US streams, 1999-2000: A national reconnaissance".
Environmental Science and Technology (Washington).
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2002
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Parasite (Ribeiroia ondatrae) infection linked to amphibian malformations in the western United States.
Ecological Monographs.
151-168.
2002
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Pharmaceuticals, hormones, and other organic wastewater contaminants in US streams, 1999-2000: A national reconnaissance.
Environmental Science and Technology (Washington).
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2002
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Analysis and detection of the herbicides dimethenamid and flufenacet and their sulfonic and oxanilic acid degradates in natural water.
Journal of Agricultural and Food Chemistry.
1045-1052.
2002
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Choosing between atmospheric pressure chemical ionization and electrospray ionization interfaces for the HPLC/MS analysis of pesticides.
Analytical Chemistry.
5441-5449.
2001
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Analysis of trace levels of sulfonamide and tetracycline antimicrobials, in groundwater and surface water using solid-phase extraction and liquid chromatography/mass spectrometry.
Analytical Chemistry.
4640-4646.
2001
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Differentiating nonpoint sources of deisopropylatrazine in surface water using discrimination diagrams.
Journal of Environmental Quality.
1836-1843.
2001
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Formation and transport of the sulfonic acid metabolites of alachlor and metolachlor in soil.
Environmental Science and Technology (Washington).
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2001
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Occurrence of cyanazine compounds in groundwater: Degradates more prevalent than the parent compound.
Environmental Science and Technology (Washington).
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2001
- Detection of pesticides and pesticide metabolites using the cross reactivity of enzyme immunoassays. Journal of AOAC International. 162-167. 2001
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Regional water-quality analysis of 2,4-D and dicamba in river water using gas chromatography isotope dilution mass spectrometry.
International Journal of Environmental Analytical Chemistry.
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2001
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Comparison of enzyme-linked immunosorbent assay and gas chromatography procedures for the detection of cyanazine and metolachlor in surface water samples.
Journal of Agricultural and Food Chemistry.
5881-5886.
2000
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Alachlor transformation patterns in aquatic field mesocosms under variable oxygen and nutrient conditions.
Water Research.
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2000
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Sources and haloacetic acid/trihalomethane formation potentials of aquatic humic substances in the Wakarusa River and Clinton Lake near Lawrence, Kansas.
Environmental Science and Technology (Washington).
4278-4286.
2000
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Multivariate correlation between concentrations of selected herbicides and derivatives in outflows from selected US midwestern reservoirs.
Environmental Science and Technology (Washington).
3307-3314.
2000
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Atmospheric transport, deposition, and fate of triazine herbicides and their metabolites in pristine areas at Isle Royale National Park.
Environmental Science and Technology (Washington).
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- 7th Symposium on the Chemistry and Fate of Modern Pesticides, Lawrence, KS, USA, 14-16 September 1999 - Foreword. Journal of Chromatography A. 1-1. 2000
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Analysis of selected herbicide metabolites in surface and ground water of the United States.
Science of the Total Environment.
157-167.
2000
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Changes in herbicide concentrations in Midwestern streams in relation to changes in use, 1989-1998.
Science of the Total Environment.
255-263.
2000
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Detection of persistent organic pollutants in the Mississippi Delta using semipermeable membrane devices.
Science of the Total Environment.
169-179.
2000
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Determination of chloroacetanilide herbicide metabolites in water using high-performance liquid chromatography-diode array detection and high-performance liquid chromatography/mass spectrometry.
Science of the Total Environment.
147-155.
2000
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Finding minimal herbicide concentrations in ground water? Try Looking for their degradates.
Science of the Total Environment.
115-122.
2000
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Occurrence of cotton herbicides and insecticides in playa lakes of the High Plains of West Texas.
Science of the Total Environment.
189-200.
2000
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Use of radioimmunoassay as a screen for antibiotics in confined animal feeding operations and confirmation by liquid chromatography/mass spectrometry.
Science of the Total Environment.
181-187.
2000
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First LC/MS determination of cyanazine amide, cyanazine acid, and cyanazine in groundwater samples.
Environmental Science and Technology (Washington).
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2000
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Measuring stream discharge by non-contact methods: A proof-of-concept experiment.
Geophysical Research Letters.
553-556.
2000
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Advances in solid-phase extraction disks for environmental chemistry.
Trends in Analytical Chemistry.
18-26.
2000
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Metolachlor and alachlor breakdown product formation patterns in aquatic field mesocosms.
Environmental Science and Technology (Washington).
4471-4476.
1999
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Metolachlor and its metabolites in tile drain and stream runoff in the canajoharie Greek watershed.
Environmental Science and Technology (Washington).
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1999
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Hydroxyatrazine in soils and sediments.
Environmental Toxicology and Chemistry.
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Surface water-ground water interaction: Herbicide transport into municipal collector wells.
Journal of Environmental Quality.
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Double-disk solid-phase extraction: Simultaneous cleanup and trace enrichment of herbicides and metabolites from environmental samples.
Analytical Chemistry.
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Relation of usage to the occurrence of gotten and rice herbicides in three streams of the Mississippi delta.
Environmental Science and Technology (Washington).
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1998
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The environmental occurrence of herbicides: The importance of degradates in ground water.
Archives of Environmental Contamination and Toxicology.
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Degradation of chloroacetanilide herbicides: The prevalence of sulfonic and oxanilic acid metabolites in Iowa groundwaters and surface waters.
Environmental Science and Technology (Washington).
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1998
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Investigation of anion-exchange and immunoaffinity particle-loaded membranes for the isolation of charged organic analytes from water.
Analytical Chemistry.
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1998
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Contribution of hydroxylated atrazine degradation products to the total atrazine load in midwestern streams.
Environmental Science and Technology (Washington).
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1998
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Evaluation of microtiter-plate enzyme-linked immunosorbent assay for the analysis of triazine and chloroacetanilide herbicides in rainfall.
Environmental Science and Technology (Washington).
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1998
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Identification of ionic chloroacetanilide-herbicide metabolites in surface water and groundwater by HPLC/MS using negative ion spray.
Analytical Chemistry.
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1997
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A study of the temporal variability of atrazine in private well water .1. Study design, implementation, and database development.
Environmental Monitoring and Assessment.
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Assessing aquifer contamination risk using immunoassay: Trace analysis of atrazine in unsaturated zone sediments.
Journal of Environmental Quality.
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Occurrence of selected herbicides and herbicide degradation products in Iowa's ground water, 1995.
Ground Water.
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Herbicides and their metabolites in rainfall: Origin, transport, and deposition patterns across the midwestern and northeastern United States, 1990-1991.
Environmental Science and Technology (Washington).
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1997
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Mixed-mode sorption of hydroxylated atrazine degradation products to soil: A mechanism for bound residue.
Environmental Science and Technology (Washington).
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Nuclear magnetic resonance identification of new sulfonic acid metabolites of chloroacetanilide herbicides.
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- Terbuthylazine and deethylterbuthylazine in rain and surface water - Determination by enzyme immunoassay and gas chromatography mass spectrometry. Acta hydrochimica et hydrobiologica / Journal for Water and Wastewater Research. 5-10. 1997
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Acetochlor in the hydrologic system in the midwestern United States, 1994.
Environmental Science and Technology (Washington).
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1996
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Glutathione conjugation and contaminant transformation.
Environmental Science and Technology (Washington).
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1996
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Identification of a new sulfenic acid metabolite of metolachlor in soil.
Environmental Science and Technology (Washington).
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1996
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Occurrence of alachlor and its sulfonated metabolite in rivers and reservoirs of the midwestern United States: The importance of sulfonation in the transport of chloroacetanilide herbicides.
Environmental Science and Technology (Washington).
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1996
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Occurrence of selected pesticides and their metabolites in near-surface aquifers of the midwestern United States.
Environmental Science and Technology (Washington).
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1996
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PESTICIDES IN NEAR-SURFACE AQUIFERS - AN ASSESSMENT USING HIGHLY SENSITIVE ANALYTICAL METHODS AND TRITIUM.
Journal of Environmental Quality.
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1995
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FORMATION AND TRANSPORT OF DEETHYLATRAZINE AND DEISOPROPYLATRAZINE IN SURFACE-WATER.
Environmental Science and Technology (Washington).
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1994
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DETERMINATION OF ALACHLOR AND ITS SULFONIC-ACID METABOLITE IN WATER BY SOLID-PHASE EXTRACTION AND ENZYME-LINKED-IMMUNOSORBENT-ASSAY.
Analytical Chemistry.
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1994
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PREFERENTIAL DEALKYLATION REACTIONS OF S-TRIAZINE HERBICIDES IN THE UNSATURATED ZONE.
Environmental Science and Technology (Washington).
600-605.
1994
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REDUCTION OF NONPOINT-SOURCE CONTAMINATION OF SURFACE-WATER AND GROUNDWATER BY STARCH ENCAPSULATION OF HERBICIDES.
Environmental Science and Technology (Washington).
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1994
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COUPLING SOLID-PHASE EXTRACTION AND ENZYME-LINKED-IMMUNOSORBENT-ASSAY FOR ULTRATRACE DETERMINATION OF HERBICIDES IN PRISTINE WATER.
Analytical Chemistry.
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GROUNDWATER AS A NONPOINT-SOURCE OF ATRAZINE AND DEETHYLATRAZINE IN A RIVER DURING BASE-FLOW CONDITIONS.
Water Resources Research.
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SYMPOSIUM ON SOLID-PHASE EXTRACTION IN ENVIRONMENTAL AND CLINICAL-CHEMISTRY - HELD IN CONJUNCTION WITH THE 203RD ACS NATIONAL MEETING - SAN-FRANCISCO, CA (USA), APRIL 5-10, 1992 - FOREWORD.
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A RECONNAISSANCE STUDY OF HERBICIDES AND THEIR METABOLITES IN SURFACE-WATER OF THE MIDWESTERN UNITED-STATES USING IMMUNOASSAY AND GAS-CHROMATOGRAPHY MASS-SPECTROMETRY.
Environmental Science and Technology (Washington).
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1992
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COMPARISON OF PURGE AND TRAP GC/MS AND PURGEABLE ORGANIC CHLORIDE ANALYSIS FOR MONITORING VOLATILE CHLORINATED HYDROCARBONS.
Ground Water.
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1992
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MIXED-MODE ISOLATION OF TRIAZINE METABOLITES FROM SOIL AND AQUIFER SEDIMENTS USING AUTOMATED SOLID-PHASE EXTRACTION.
Analytical Chemistry.
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ISOLATION OF HYDROPHILIC ORGANIC-ACIDS FROM WATER USING NONIONIC MACROPOROUS RESINS.
Organic Geochemistry.
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1992
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FATE OF ALKYLBENZENESULFONATES AND DIALKYLTETRALINSULFONATES IN SEWAGE-CONTAMINATED GROUNDWATER.
Environmental Science and Technology (Washington).
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1992
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HERBICIDE TRANSPORT IN RIVERS - IMPORTANCE OF HYDROLOGY AND GEOCHEMISTRY IN NONPOINT-SOURCE CONTAMINATION.
Environmental Science and Technology (Washington).
538-545.
1992
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DISTINGUISHING SYMPATHOMIMETIC AMINES FROM AMPHETAMINE AND METHAMPHETAMINE IN URINE BY GAS-CHROMATOGRAPHY MASS-SPECTROMETRY.
Journal of Analytical Toxicology.
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GEOCHEMICAL HETEROGENEITY IN A SAND AND GRAVEL AQUIFER - EFFECT OF SEDIMENT MINERALOGY AND PARTICLE-SIZE ON THE SORPTION OF CHLOROBENZENES.
Journal of Contaminant Hydrology.
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HERBICIDES IN SURFACE WATERS OF THE MIDWESTERN UNITED-STATES - THE EFFECT OF SPRING FLUSH.
Environmental Science and Technology (Washington).
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1991
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FORMATION AND TRANSPORT OF DEETHYLATRAZINE IN THE SOIL AND VADOSE ZONE.
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TEMPORAL AND SPATIAL VARIATIONS IN THE SOLUTE CONTENT OF AN ALPINE STREAM, COLORADO FRONT RANGE.
Geomorphology.
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ENZYME-LINKED-IMMUNOSORBENT-ASSAY COMPARED WITH GAS-CHROMATOGRAPHY MASS-SPECTROMETRY FOR THE DETERMINATION OF TRIAZINE HERBICIDES IN WATER.
Analytical Chemistry.
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1990
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RETARDATION OF AMMONIUM AND POTASSIUM-TRANSPORT THROUGH A CONTAMINATED SAND AND GRAVEL AQUIFER - THE ROLE OF CATION-EXCHANGE.
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LONG-TERM FATE OF ORGANIC MICROPOLLUTANTS IN SEWAGE-CONTAMINATED GROUNDWATER.
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1988
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DETERMINATION OF ALKYLBENZENESULFONATE SURFACTANTS IN GROUNDWATER USING MACRORETICULAR RESINS AND C-13 NUCLEAR-MAGNETIC-RESONANCE SPECTROMETRY.
Analytical Chemistry.
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1987
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BIOGEOCHEMISTRY OF AQUATIC HUMIC SUBSTANCES IN THOREAU BOG, CONCORD, MASSACHUSETTS.
Ecology.
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PYROLYSIS-MASS SPECTROMETRY PATTERN-RECOGNITION ON A WELL-CHARACTERIZED SUITE OF HUMIC SAMPLES.
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COMPLEXATION OF COPPER BY AQUATIC HUMIC SUBSTANCES FROM DIFFERENT ENVIRONMENTS.
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THE CONTRIBUTION OF HUMIC SUBSTANCES TO THE ACIDITY OF COLORED NATURAL-WATERS.
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PREPARATIVE ISOLATION OF AQUATIC HUMIC SUBSTANCES.
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BASELINE STUDY OF THE CONCENTRATION OF MOLYBDENUM IN BOTTOM SEDIMENTS OF THE MAJOR RIVERS IN COLORADO, USA.
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COMPARISON OF XAD MACROPOROUS RESINS FOR THE CONCENTRATION OF FULVIC-ACID FROM AQUEOUS-SOLUTION.
Analytical Chemistry.
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CONDUCTIMETRIC DETECTION OF ORGANIC-ACIDS IN REVERSED-PHASE CHROMATOGRAPHY.
Journal of Chromatography A.
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SEPARATION OF HUMIC SUBSTANCES BY PH GRADIENT DESORPTION FROM A HYDROPHOBIC RESIN.
Analytical Chemistry.
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PREDICTION OF CAPACITY FACTORS FOR AQUEOUS ORGANIC SOLUTES ADSORBED ON A POROUS ACRYLIC RESIN.
Analytical Chemistry.
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GEOLOGY AND RB-SR CHRONOLOGY OF MIDDLE PRECAMBRIAN ROCKS IN EASTERN AND CENTRAL WISCONSIN.
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Occurrence of Benzene Polycarboxylic Acids in Ash and Streamwater after the Cameron Peak Fire.
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