Skip to main content
U.S. flag

An official website of the United States government

FY26 Capabilities and Services

Active
By Organic Geochemistry Research Laboratory (OGRL) October 1, 2024

Organic Geochemistry Research Lab

(OGRL)

The U.S. Geological Survey (USGS) Kansas Water Science Center Organic Geochemistry Research Laboratory (OGRL) was established in 1987. The OGRL is a multidisciplinary program that contributes knowledge about the distribution, fate, transport, and effects of new and understudied organic compounds that may affect human health and (or) ecosystems. 

The OGRL consists of two units: Algal and Other Environmental Toxins (AET) Unit and Environmental Organic Chemistry (EOC) Unit. The OGRL does independent and collaborative research, develops robust analytical methods, and provides fee-for-service analytical laboratory analyses.

Algal and Other Environmental Toxins Unit

The Algal and Environmental Toxins Unit has the capability to detect toxins that could be harmful to human health and the environment. 

Media
OGRL Scientists standing near a dam spillway preparing to use a field Turbidimeter in the bed of a truck.
Sources/Usage: Public Domain. View Media Details

 

  •  Enzyme-linked immunosorbent assay (ELISA) techniques in low and high salinity waters for the following toxins: anatoxin-a, cylindrospermopsin, microcystin, and saxitoxin. 

     

  • Liquid chromatography/high resolution mass spectrometry for the following: 

     

    •  Total and dissolved freshwater toxins (includes 13 analytes)

       

    •  Total and dissolved marine toxins (includes 9 analytes)

       

    • Total and dissolved freshwater and marine toxins (includes 21 analytes)

       

    •  Nontarget screening

 

Environmental Organic Chemistry Unit

Using state-of-the-art instrumentation and techniques, the Environmental Organic Chemistry Unit analyzes samples from various matrices to determine the occurrence of organic contaminants in the environment. 

Media
OGRL scientist standing in water using a net to collect fish during a visit to a fish hatchery in Kansas.
Sources/Usage: Public Domain. View Media Details

  •  Sample preparation, including filtering, accelerated solvent extractions, bioassay extractions, and solid-phase extractions. 

     

  •  Liquid chromatography/tandem mass spectrometry methods in water and solids (soil, sediment, and biosolids) for the following: 

     

    •  Artificial sweeteners (includes 5 analytes) 

       

    •  Atrazine

       

    •  Glyphosate, aminomethylphosphonic acid (AMPA), and glufosinate

       

    •  Four class antibiotic method (includes 33 analytes)

       

    • Pharmaceutical method (includes 84 compounds)

       

    • Hormones: androgens, conjugates, and estrogens (includes 32 analytes)

       

    •  Hormones: progestins (includes 11 analytes) 

       

    •  Hormones: phytoestrogens (includes 6 analytes)  

       

    •  Mycotoxins (includes 8 analytes)

       

    • Tire leachate: 6 PPD-quinone

 

FY26 OGRL Service List 

FY26 Sample Collection and Processing Directions 

 

 

Below are other science projects associated with this project.

Photo of algal toxins in a creek

OGRL Algal Toxins Methods of Analysis

Algal toxins are a group of toxic compounds produced by a range of photosynthetic freshwater and marine plankton. These toxins have the ability to cause sickness in animals and humans and in severe cases lead to death. OGRL has the ability to evaluate and conduct occurrence, fate, transport, effects, and treatability studies methods.
By
Central Plains Water Science Center, Organic Geochemistry Research Laboratory (OGRL)
OGRL Algal Toxins Methods of Analysis

OGRL Algal Toxins Methods of Analysis

Algal toxins are a group of toxic compounds produced by a range of photosynthetic freshwater and marine plankton. These toxins have the ability to cause sickness in animals and humans and in severe cases lead to death. OGRL has the ability to evaluate and conduct occurrence, fate, transport, effects, and treatability studies methods.
Learn More

Below are multimedia items associated with this project.

No results found.

Below are publications associated with this project.

Filter Total Items: 107

Eleven-year trend in acetanilide pesticide degradates in the Iowa River, Iowa Eleven-year trend in acetanilide pesticide degradates in the Iowa River, Iowa

Trends in concentration and loads of acetochlor, alachlor, and metolachlor and their ethanasulfonic (ESA) and oxanilic (OXA) acid degradates were studied from 1996 through 2006 in the main stem of the Iowa River, Iowa and in the South Fork Iowa River, a small tributary near the headwaters of the Iowa River. Concentration trends were determined using the parametric regression model...
Authors
Stephen J. Kalkhoff, Aldo V. Vecchia, Paul D. Capel, Michael T. Meyer
By
Water Resources Mission Area, Central Midwest Water Science Center, Central Plains Water Science Center

Fate and transport of cyanobacteria and associated toxins and taste-and-odor compounds from upstream reservoir releases in the Kansas River, Kansas, September and October 2011 Fate and transport of cyanobacteria and associated toxins and taste-and-odor compounds from upstream reservoir releases in the Kansas River, Kansas, September and October 2011

Cyanobacteria cause a multitude of water-quality concerns, including the potential to produce toxins and taste-and-odor compounds. Toxins and taste-and-odor compounds may cause substantial economic and public health concerns and are of particular interest in lakes, reservoirs, and rivers that are used for drinking-water supply, recreation, or aquaculture. The Kansas River is a primary...
Authors
Jennifer L. Graham, Andrew C. Ziegler, Brian L. Loving, Keith A. Loftin
By
Water Resources Mission Area, Central Plains Water Science Center

Relations between hydrology, water quality, and taste-and-odor causing organisms and compounds in Lake Houston, Texas, April 2006-September 2008 Relations between hydrology, water quality, and taste-and-odor causing organisms and compounds in Lake Houston, Texas, April 2006-September 2008

Lake Houston is a surface-water-supply reservoir and an important recreational resource for the city of Houston, Texas. Growing concerns over water quality in Lake Houston prompted a detailed assessment of water quality in the reservoir. The assessment focused on water-quality constituents that affect the aesthetic quality of drinking water. The hydrologic and water-quality conditions...
Authors
Amy M. Beussink, Jennifer L. Graham
By
Water Resources Mission Area, Oklahoma-Texas Water Science Center, Central Plains Water Science Center

Lagrangian sampling of wastewater treatment plant effluent in Boulder Creek, Colorado, and Fourmile Creek, Iowa, during the summer of 2003 and spring of 2005— Hydrological and water-quality data Lagrangian sampling of wastewater treatment plant effluent in Boulder Creek, Colorado, and Fourmile Creek, Iowa, during the summer of 2003 and spring of 2005— Hydrological and water-quality data

This report presents methods and data for a Lagrangian sampling investigation into chemical loading and in-stream attenuation of inorganic and organic contaminants in two wastewater treatment-plant effluent-dominated streams: Boulder Creek, Colorado, and Fourmile Creek, Iowa. Water-quality sampling was timed to coincide with low-flow conditions when dilution of the wastewater treatment...
Authors
Larry B. Barber, Steffanie H. Keefe, Dana W. Kolpin, Douglas J. Schnoebelen, Jennifer L. Flynn, Gregory K. Brown, Edward T. Furlong, Susan T. Glassmeyer, James L. Gray, Michael T. Meyer, Mark W. Sandstrom, Howard E. Taylor, Steven D. Zaugg
By
Ecosystems Mission Area, Water Resources Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Plains Water Science Center, National Water Quality Laboratory

Microphotographs of cyanobacteria documenting the effects of various cell-lysis techniques Microphotographs of cyanobacteria documenting the effects of various cell-lysis techniques

Cyanotoxins are a group of organic compounds biosynthesized intracellularly by many species of cyanobacteria found in surface water. The United States Environmental Protection Agency has listed cyanotoxins on the Safe Drinking Water Act's Contaminant Candidate List 3 for consideration for future regulation to protect public health. Cyanotoxins also pose a risk to humans and other...
Authors
Barry H. Rosen, Keith A. Loftin, Christopher E. Smith, Rachael F. Lane, Susan P. Keydel
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Plains Water Science Center

Occurrence of azoxystrobin, propiconazole, and selected other fungicides in US streams, 2005-2006 Occurrence of azoxystrobin, propiconazole, and selected other fungicides in US streams, 2005-2006

Fungicides are used to prevent foliar diseases on a wide range of vegetable, field, fruit, and ornamental crops. They are generally more effective as protective rather than curative treatments, and hence tend to be applied before infections take place. Less than 1% of US soybeans were treated with a fungicide in 2002 but by 2006, 4% were treated. Like other pesticides, fungicides can...
Authors
William A. Battaglin, Mark W. Sandstrom, Kathryn Kuivila, Dana W. Kolpin, Michael T. Meyer
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Colorado Water Science Center, California Water Science Center, Central Plains Water Science Center, National Water Quality Laboratory

Comparative mobility of sulfonamides and bromide tracer in three soils Comparative mobility of sulfonamides and bromide tracer in three soils

In animal agriculture, sulfonamides are one of the routinely used groups of antimicrobials for therapeutic and sub-therapeutic purposes. It is observed that, the animals when administered the antimicrobials, often do not completely metabolize them; and excrete the partially metabolized forms into the environment. Due to the continued use of antimicrobials and disposal of untreated waste
Authors
S.T. Kurwadkar, C.D. Adams, Michael T. Meyer, Dana W. Kolpin
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Plains Water Science Center

Occurrence of antibiotic compounds in source water and finished drinking water from the upper Scioto River Basin, Ohio, 2005-6 Occurrence of antibiotic compounds in source water and finished drinking water from the upper Scioto River Basin, Ohio, 2005-6

The occurrence of antibiotics in surface water and groundwater in urban basins has become a topic of increasing interest in recent years. Little is known about the occurrence, fate, or transport of these compounds and the possible health effects in humans and aquatic life. The U.S. Geological Survey, in cooperation with the City of Columbus, Division of Power and Water, did a study to...
Authors
Dennis P. Finnegan, Laura A. Simonson, Michael T. Meyer
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Ohio-Kentucky-Indiana Water Science Center

Laboratory simulated transport of microcystin-LR and cylindrospermopsin in groundwater under the influence of stormwater ponds: implications for harvesting of infiltrated stormwater Laboratory simulated transport of microcystin-LR and cylindrospermopsin in groundwater under the influence of stormwater ponds: implications for harvesting of infiltrated stormwater

Water shortages in the southeastern United States have led to a need for more intensive management and usage of stormwater for beneficial uses such as irrigation. Harvesting of infiltrated stormwater from horizontal wells in sandy aquifer sediments beneath stormwater ponds has emerged as an alternative in need of evaluation. Cyanobacteria may proliferate in stormwater ponds; cyanotoxins...
Authors
Andrew M. O’Reilly, Martin P. Wanielista, Keith A. Loftin, Ni-Bin Chang
By
Central Plains Water Science Center

Use and environmental occurrence of pharmaceuticals in freestall dairy farms with manured forage fields Use and environmental occurrence of pharmaceuticals in freestall dairy farms with manured forage fields

Environmental releases of antibiotics from concentrated animal feeding operations (CAFOs) are of increasing regulatory concern. This study investigates the use and occurrence of antibiotics in dairy CAFOs and their potential transport into first-encountered groundwater. On two dairies we conducted four seasonal sampling campaigns, each across 13 animal production and waste management...
Authors
Naoko Watanabe, Brian A. Bergamaschi, Keith A. Loftin, Michael T. Meyer, Thomas Harter
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Plains Water Science Center, California Water Science Center

Tet and sul antibiotic resistance genes in livestock lagoons of various operation type, configuration, and antibiotic occurrence Tet and sul antibiotic resistance genes in livestock lagoons of various operation type, configuration, and antibiotic occurrence

Although livestock operations are known to harbor elevated levels of antibiotic resistant bacteria, few studies have examined the potential of livestock waste lagoons to reduce antibiotic resistance genes (ARGs). The purpose of this study was to determine the prevalence and examine the behavior of tetracycline [tet(O) and tet(W)] and sulfonamide [sul(I) and su/(II)] ARGsin a broad cross...
Authors
C.W. McKinney, Keith A. Loftin, Michael T. Meyer, J.G. Davis, A. Pruden
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Plains Water Science Center

Phytoestrogens and mycotoxins in Iowa streams: An examination of underinvestigated compounds in agricultural basins Phytoestrogens and mycotoxins in Iowa streams: An examination of underinvestigated compounds in agricultural basins

This study provides the first broad-scale investigation on the spatial and temporal occurrence of phytoestrogens and mycotoxins in streams in the United States. Fifteen stream sites across Iowa were sampled five times throughout the 2008 growing season to capture a range of climatic and crop-growth conditions. Basin size upstream from sampling sites ranged from 7 km2 to >836,000 km2...
Authors
Dana W. Kolpin, Corinne C. Hoerger, Michael T. Meyer, Felix E. Wettstein, Laura E. Hubbard, Thomas D. Bucheli
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Midwest Water Science Center, Central Plains Water Science Center

The U.S. Geological Survey (USGS) Kansas Water Science Center Organic Geochemistry Research Laboratory (OGRL) was established in 1987. The OGRL is a multidisciplinary program that contributes knowledge about the distribution, fate, transport, and effects of new and understudied organic compounds that may affect human health and (or) ecosystems. 

The OGRL consists of two units: Algal and Other Environmental Toxins (AET) Unit and Environmental Organic Chemistry (EOC) Unit. The OGRL does independent and collaborative research, develops robust analytical methods, and provides fee-for-service analytical laboratory analyses.

Algal and Other Environmental Toxins Unit

The Algal and Environmental Toxins Unit has the capability to detect toxins that could be harmful to human health and the environment. 

Media
OGRL Scientists standing near a dam spillway preparing to use a field Turbidimeter in the bed of a truck.
Sources/Usage: Public Domain. View Media Details

 

  •  Enzyme-linked immunosorbent assay (ELISA) techniques in low and high salinity waters for the following toxins: anatoxin-a, cylindrospermopsin, microcystin, and saxitoxin. 

     

  • Liquid chromatography/high resolution mass spectrometry for the following: 

     

    •  Total and dissolved freshwater toxins (includes 13 analytes)

       

    •  Total and dissolved marine toxins (includes 9 analytes)

       

    • Total and dissolved freshwater and marine toxins (includes 21 analytes)

       

    •  Nontarget screening

 

Environmental Organic Chemistry Unit

Using state-of-the-art instrumentation and techniques, the Environmental Organic Chemistry Unit analyzes samples from various matrices to determine the occurrence of organic contaminants in the environment. 

Media
OGRL scientist standing in water using a net to collect fish during a visit to a fish hatchery in Kansas.
Sources/Usage: Public Domain. View Media Details

  •  Sample preparation, including filtering, accelerated solvent extractions, bioassay extractions, and solid-phase extractions. 

     

  •  Liquid chromatography/tandem mass spectrometry methods in water and solids (soil, sediment, and biosolids) for the following: 

     

    •  Artificial sweeteners (includes 5 analytes) 

       

    •  Atrazine

       

    •  Glyphosate, aminomethylphosphonic acid (AMPA), and glufosinate

       

    •  Four class antibiotic method (includes 33 analytes)

       

    • Pharmaceutical method (includes 84 compounds)

       

    • Hormones: androgens, conjugates, and estrogens (includes 32 analytes)

       

    •  Hormones: progestins (includes 11 analytes) 

       

    •  Hormones: phytoestrogens (includes 6 analytes)  

       

    •  Mycotoxins (includes 8 analytes)

       

    • Tire leachate: 6 PPD-quinone

 

FY26 OGRL Service List 

FY26 Sample Collection and Processing Directions 

 

 

Below are other science projects associated with this project.

Photo of algal toxins in a creek

OGRL Algal Toxins Methods of Analysis

Algal toxins are a group of toxic compounds produced by a range of photosynthetic freshwater and marine plankton. These toxins have the ability to cause sickness in animals and humans and in severe cases lead to death. OGRL has the ability to evaluate and conduct occurrence, fate, transport, effects, and treatability studies methods.
By
Central Plains Water Science Center, Organic Geochemistry Research Laboratory (OGRL)
OGRL Algal Toxins Methods of Analysis

OGRL Algal Toxins Methods of Analysis

Algal toxins are a group of toxic compounds produced by a range of photosynthetic freshwater and marine plankton. These toxins have the ability to cause sickness in animals and humans and in severe cases lead to death. OGRL has the ability to evaluate and conduct occurrence, fate, transport, effects, and treatability studies methods.
Learn More

Below are multimedia items associated with this project.

No results found.

Below are publications associated with this project.

Filter Total Items: 107

Eleven-year trend in acetanilide pesticide degradates in the Iowa River, Iowa Eleven-year trend in acetanilide pesticide degradates in the Iowa River, Iowa

Trends in concentration and loads of acetochlor, alachlor, and metolachlor and their ethanasulfonic (ESA) and oxanilic (OXA) acid degradates were studied from 1996 through 2006 in the main stem of the Iowa River, Iowa and in the South Fork Iowa River, a small tributary near the headwaters of the Iowa River. Concentration trends were determined using the parametric regression model...
Authors
Stephen J. Kalkhoff, Aldo V. Vecchia, Paul D. Capel, Michael T. Meyer
By
Water Resources Mission Area, Central Midwest Water Science Center, Central Plains Water Science Center

Fate and transport of cyanobacteria and associated toxins and taste-and-odor compounds from upstream reservoir releases in the Kansas River, Kansas, September and October 2011 Fate and transport of cyanobacteria and associated toxins and taste-and-odor compounds from upstream reservoir releases in the Kansas River, Kansas, September and October 2011

Cyanobacteria cause a multitude of water-quality concerns, including the potential to produce toxins and taste-and-odor compounds. Toxins and taste-and-odor compounds may cause substantial economic and public health concerns and are of particular interest in lakes, reservoirs, and rivers that are used for drinking-water supply, recreation, or aquaculture. The Kansas River is a primary...
Authors
Jennifer L. Graham, Andrew C. Ziegler, Brian L. Loving, Keith A. Loftin
By
Water Resources Mission Area, Central Plains Water Science Center

Relations between hydrology, water quality, and taste-and-odor causing organisms and compounds in Lake Houston, Texas, April 2006-September 2008 Relations between hydrology, water quality, and taste-and-odor causing organisms and compounds in Lake Houston, Texas, April 2006-September 2008

Lake Houston is a surface-water-supply reservoir and an important recreational resource for the city of Houston, Texas. Growing concerns over water quality in Lake Houston prompted a detailed assessment of water quality in the reservoir. The assessment focused on water-quality constituents that affect the aesthetic quality of drinking water. The hydrologic and water-quality conditions...
Authors
Amy M. Beussink, Jennifer L. Graham
By
Water Resources Mission Area, Oklahoma-Texas Water Science Center, Central Plains Water Science Center

Lagrangian sampling of wastewater treatment plant effluent in Boulder Creek, Colorado, and Fourmile Creek, Iowa, during the summer of 2003 and spring of 2005— Hydrological and water-quality data Lagrangian sampling of wastewater treatment plant effluent in Boulder Creek, Colorado, and Fourmile Creek, Iowa, during the summer of 2003 and spring of 2005— Hydrological and water-quality data

This report presents methods and data for a Lagrangian sampling investigation into chemical loading and in-stream attenuation of inorganic and organic contaminants in two wastewater treatment-plant effluent-dominated streams: Boulder Creek, Colorado, and Fourmile Creek, Iowa. Water-quality sampling was timed to coincide with low-flow conditions when dilution of the wastewater treatment...
Authors
Larry B. Barber, Steffanie H. Keefe, Dana W. Kolpin, Douglas J. Schnoebelen, Jennifer L. Flynn, Gregory K. Brown, Edward T. Furlong, Susan T. Glassmeyer, James L. Gray, Michael T. Meyer, Mark W. Sandstrom, Howard E. Taylor, Steven D. Zaugg
By
Ecosystems Mission Area, Water Resources Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Plains Water Science Center, National Water Quality Laboratory

Microphotographs of cyanobacteria documenting the effects of various cell-lysis techniques Microphotographs of cyanobacteria documenting the effects of various cell-lysis techniques

Cyanotoxins are a group of organic compounds biosynthesized intracellularly by many species of cyanobacteria found in surface water. The United States Environmental Protection Agency has listed cyanotoxins on the Safe Drinking Water Act's Contaminant Candidate List 3 for consideration for future regulation to protect public health. Cyanotoxins also pose a risk to humans and other...
Authors
Barry H. Rosen, Keith A. Loftin, Christopher E. Smith, Rachael F. Lane, Susan P. Keydel
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Plains Water Science Center

Occurrence of azoxystrobin, propiconazole, and selected other fungicides in US streams, 2005-2006 Occurrence of azoxystrobin, propiconazole, and selected other fungicides in US streams, 2005-2006

Fungicides are used to prevent foliar diseases on a wide range of vegetable, field, fruit, and ornamental crops. They are generally more effective as protective rather than curative treatments, and hence tend to be applied before infections take place. Less than 1% of US soybeans were treated with a fungicide in 2002 but by 2006, 4% were treated. Like other pesticides, fungicides can...
Authors
William A. Battaglin, Mark W. Sandstrom, Kathryn Kuivila, Dana W. Kolpin, Michael T. Meyer
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Colorado Water Science Center, California Water Science Center, Central Plains Water Science Center, National Water Quality Laboratory

Comparative mobility of sulfonamides and bromide tracer in three soils Comparative mobility of sulfonamides and bromide tracer in three soils

In animal agriculture, sulfonamides are one of the routinely used groups of antimicrobials for therapeutic and sub-therapeutic purposes. It is observed that, the animals when administered the antimicrobials, often do not completely metabolize them; and excrete the partially metabolized forms into the environment. Due to the continued use of antimicrobials and disposal of untreated waste
Authors
S.T. Kurwadkar, C.D. Adams, Michael T. Meyer, Dana W. Kolpin
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Plains Water Science Center

Occurrence of antibiotic compounds in source water and finished drinking water from the upper Scioto River Basin, Ohio, 2005-6 Occurrence of antibiotic compounds in source water and finished drinking water from the upper Scioto River Basin, Ohio, 2005-6

The occurrence of antibiotics in surface water and groundwater in urban basins has become a topic of increasing interest in recent years. Little is known about the occurrence, fate, or transport of these compounds and the possible health effects in humans and aquatic life. The U.S. Geological Survey, in cooperation with the City of Columbus, Division of Power and Water, did a study to...
Authors
Dennis P. Finnegan, Laura A. Simonson, Michael T. Meyer
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Ohio-Kentucky-Indiana Water Science Center

Laboratory simulated transport of microcystin-LR and cylindrospermopsin in groundwater under the influence of stormwater ponds: implications for harvesting of infiltrated stormwater Laboratory simulated transport of microcystin-LR and cylindrospermopsin in groundwater under the influence of stormwater ponds: implications for harvesting of infiltrated stormwater

Water shortages in the southeastern United States have led to a need for more intensive management and usage of stormwater for beneficial uses such as irrigation. Harvesting of infiltrated stormwater from horizontal wells in sandy aquifer sediments beneath stormwater ponds has emerged as an alternative in need of evaluation. Cyanobacteria may proliferate in stormwater ponds; cyanotoxins...
Authors
Andrew M. O’Reilly, Martin P. Wanielista, Keith A. Loftin, Ni-Bin Chang
By
Central Plains Water Science Center

Use and environmental occurrence of pharmaceuticals in freestall dairy farms with manured forage fields Use and environmental occurrence of pharmaceuticals in freestall dairy farms with manured forage fields

Environmental releases of antibiotics from concentrated animal feeding operations (CAFOs) are of increasing regulatory concern. This study investigates the use and occurrence of antibiotics in dairy CAFOs and their potential transport into first-encountered groundwater. On two dairies we conducted four seasonal sampling campaigns, each across 13 animal production and waste management...
Authors
Naoko Watanabe, Brian A. Bergamaschi, Keith A. Loftin, Michael T. Meyer, Thomas Harter
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Plains Water Science Center, California Water Science Center

Tet and sul antibiotic resistance genes in livestock lagoons of various operation type, configuration, and antibiotic occurrence Tet and sul antibiotic resistance genes in livestock lagoons of various operation type, configuration, and antibiotic occurrence

Although livestock operations are known to harbor elevated levels of antibiotic resistant bacteria, few studies have examined the potential of livestock waste lagoons to reduce antibiotic resistance genes (ARGs). The purpose of this study was to determine the prevalence and examine the behavior of tetracycline [tet(O) and tet(W)] and sulfonamide [sul(I) and su/(II)] ARGsin a broad cross...
Authors
C.W. McKinney, Keith A. Loftin, Michael T. Meyer, J.G. Davis, A. Pruden
By
Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Plains Water Science Center

Phytoestrogens and mycotoxins in Iowa streams: An examination of underinvestigated compounds in agricultural basins Phytoestrogens and mycotoxins in Iowa streams: An examination of underinvestigated compounds in agricultural basins

This study provides the first broad-scale investigation on the spatial and temporal occurrence of phytoestrogens and mycotoxins in streams in the United States. Fifteen stream sites across Iowa were sampled five times throughout the 2008 growing season to capture a range of climatic and crop-growth conditions. Basin size upstream from sampling sites ranged from 7 km2 to >836,000 km2...
Authors
Dana W. Kolpin, Corinne C. Hoerger, Michael T. Meyer, Felix E. Wettstein, Laura E. Hubbard, Thomas D. Bucheli
By
Water Resources Mission Area, Ecosystems Mission Area, Toxic Substances Hydrology, Environmental Health Program, Central Midwest Water Science Center, Central Plains Water Science Center
Was this page helpful?