Pesticide Investigations

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USGS scientist collecting water samples for the analysis of pesticide concentrations in Cedar Creek near Pansey, AL (site ID 02343848). Samples were collected as part of a reconnaissance of pesticides in stream waters in peanut production areas in the Southeastern United States (circa 2003)

USGS scientist measuring field parameters (pH, temperature, .) in Cedar Creek near Pansey, AL (site ID 02343848), as part of a reconnaissance of pesticides in stream waters in peanut production areas in the Southeastern United States (circa 2003)

USGS scientist collecting water samples for the analysis of pesticides downstream from peanut fields along Cedar Creek near Pansey, AL, (site ID 02343848) (circa 2003)

Collecting water-quality samples from a bridge on Big Creek near Rehobeth, AL (site ID 02358765). The samples were analyzed for pesticides as part of a reconnaissance of stream waters in peanut production areas in the Southeastern United States (circa 2003)

An autosampler set up to collect water samples for analysis of pesticides during storm events. The autosampler was located on Black Creek near Blitchton, GA (circa 2003)

The USGS sampled 52 sites on Midwestern streams during post-application runoff in 1989, 1990, 1994, 1995, and 1998 as part of a reconnaissance of herbicide concentrations in streams.

USGS scientist lowering a water-quality sampler into the Iowa River near Marengo, IA, (site ID 05453100). during the 1993 flood of the upper Mississippi River Watershed. The samples were analyzed for nutrients and pesticides

Collecting a water sample (grab sample) for the reconnaissance of herbicide concentrations in streams

USGS scientists collecting large-volume water samples off of a bridge across the San Joaquin River near Vernalis, CA, in support of a study of pesticides in runoff from agricultural fields in the watershed (circa 2000)

The analysis of pesticides sometimes requires large-volume water samples to detect pesticides that are toxic at low concentrations. This is a view of a pump used to collect samples from the San Joaquin River near Vernalis, CA (circa 2000)

Collecting water samples for pesticide analysis off of a bridge over the San Joaquin River near Vernalis, CA (circa 2000)

Packing in supplies as part of a study of herbicides transported by rain to Isle Royale National Park, MI

USGS scientists studied the transport of herbicides by rain to the pristine waters of Isle Royale National Park, MI

The supplies for the analysis of pesticides by enzyme-linked immunosorbent assay (ELISA)

USGS scientist operating a gas chromatography/mass spectrometer (GC/MS)

USGS scientist using an autotrace to extract pesticides from water samples in preparation for chromatography/mass spectrometer (GC/MS) analysis

A liquid chromatography/mass spectrometry (LC/MS) instrument with an on-line solid phase extraction (SPE) system used for the analysis of pesticides in water

USGS scientist preparing a sediment sample for the analysis of pesticides

Incorporating an encapsulated herbicide (atrazine) into the soil as part of an experiment to determine if encapsulating herbicides reduces runoff. The white pipes are suction cup lysimeters used to sample water from the unsaturated zone