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Dissolved Pesticide Data For The San Joaquin River At Vernalis And The Sacramento River At Sacramento, California, 1991-94.pdf

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Preview of Dissolved Pesticide Data for the San Joaquin River at Vernalis and the Sacramento River at Sacramento, California, 1991-94

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Summary

The samples were analyzed for organic pesticides using solid-phase extraction and gas chromatograph-mass spectrometry. The study is part of a larger project by the U.S. Geological Survey to understand the fate and transport of organic pesticides in the San Francisco Bay Estuary, which receives significant agricultural runoff from these rivers.

## Introduction
The Central Valley of California, including the San Joaquin and Sacramento Rivers, drains extensive agricultural areas where numerous organic pesticides are used. These pesticides enter the San Francisco Bay Estuary, raising concerns about their environmental impact. The U.S. Geological Survey initiated the San Francisco Bay Estuary Toxic Contaminants Project in 1990 to investigate pesticide transport and transformation within the estuary.

## Sample Collection and Analysis
Water samples were collected at Vernalis (San Joaquin River) and Sacramento (Sacramento River) on a routine basis from January 1991 to April 1994. The samples were filtered, extracted using solid-phase extraction, and analyzed for pesticide concentrations via gas chromatograph-mass spectrometry. Method detection limits were established for both the original and modified analytical methods.

## Key Findings
- Pesticide Concentrations: Data reveal fluctuations in pesticide levels throughout the year at both sites.
- Site Comparisons: The site at Vernalis, downstream from most other San Joaquin Valley inputs, shows distinct patterns compared to Sacramento, reflecting the unique contributions of each river's drainage area.
- Project Contributions: This study provides valuable data for understanding pesticide transport and transformation in the San Francisco Bay Estuary, supporting the broader goals of the Toxic Contaminants Hydrology program.

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File Format: PDF
File Size: 1.06 MB
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