USGS

Atmospheric Transport of Pesticides in the Sacramento, California, Metropolitan Area, 1996-1997

By Michael S. Majewski and David S. Baston

 

U.S. GEOLOGICAL SURVEY

Water Resources Investigation Report 02-4100

 


Prepared in cooperation with the

California Regional Water Quality Control Board, Central Valley Region

California Department of Pesticide Regulation

 

Sacramento, California 2002




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Report with cover (2.4 MB PDF) Acrobat reader)


Abstract

Weekly composite, bulk air was sampled with respect to wind speed and direction from January 1996 through December 1997 in one urban and two agricultural locations in Sacramento County, California. The sampling sites were located along a north-south transect, the dominant directions of the prevailing winds. The samples were analyzed for a variety of current-use pesticides, including dormant orchard spray insecticides and rice herbicides. A variety of pesticides were detected throughout the year, predominantly chlorpyrifos, diazinon, and trifluralin. The data obtained during the winter and spring suggest that some pesticides used in agricultural areas become airborne and may be transported into the urban area. Confirmation of this drift is difficult, however, because these three predominant pesticides, as well as other detected pesticides, also are heavily used in the urban environment. The spring data clearly show that molinate and thiobencarb, two herbicides used only in rice production, do drift into the urban environment.

CONTENTS

Abstract

Introduction

Purpose and Scope

Acknowledgments

Sample Collection

Study Area Description

Sampling Site Description

Collection Procedure

Analytical Methodology

Sample Analysis

Gas Chromatography

Quality Control

Pesticide Recoveries

Laboratory Spike Samples

Collection Efficiency

Pesticide Detection Frequency

Pesticide Use Information

Herbicides

Insecticides

Fungicides

Conclusions and Summary

References Cited

Appendix 1. Sampling date, rainfall amount, sample volume, and pesticide air concentration for each
north and south sample taken at the Franklin Field Airport site, California

Appendix 2. Sampling date, rainfall amount, sample volume, and pesticide air concentration for each
north and south sample taken at the Sacramento Metropolitan area site, California

Appendix 3. Sampling date, rainfall amount, sample volume, and pesticide air concentration
for each north and south sample taken at the Sacramento International Airport site, California



Water Resources of California



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