Occurrence and Transport of Agricultural Chemicals in the Mississippi River Basin July through August 1993

U.S. Geological Survey, Circular 1120-C

by Donald A. Goolsby, William A. Battaglin, and E. Michael Thurman

Table of Contents

Foreword

Abstract

Introduction

Purpose and scope

Sources and properties of selected agricultural chemicals

Drinking-water standards and aquatic-life guidelines

Previous studies of agricultural chemicals in the Mississippi River Basin

Occurrence and transport of agricultural chemicals during the 1993 flood

Data-collection methods

Occurrence and distribution of herbicides and nitrate-nitrogen

Relation to drinking-water standards

Transport of herbicides and nitrate-nitrogen

Calculation methods

Transport of herbicides

Transport of nitrate

Summary

References

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