USGS

Water Resources of Colorado

Work Plan for Determining the Occurrence of Glyphosate, Its Transformation Product AMPA, Other Herbicide Compounds, and Antibiotics in Midwestern United States Streams, 2002

By W.A. Battaglin, E.M. Thurman, D.W. Kolpin, E.A. Scribner, M.W. Sandstrom, and K.M. Kuivila

Available from the U.S. Geological Survey, Branch of Information Services, Box 25286, Denver Federal Center, Denver, CO 80225, USGS Open-File Report 03–69, 18 p., 2 figs.

This document also is available in pdf format: Adobe Acrobat Icon OFR 03–69.pdf (852 K)
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Abstract

Changes in herbicide use in the Midwestern United States have been substantial over the last 5 years. Most significant is a tripling in the use of glyphosate (N-[phosphonomethyl]glycin). Over this same time period (19972001), atrazine use increased by 20 percent and acetochlor use increased by 10 percent, while cyanazine use decreased by 99 percent, alachlor use decreased by 70 percent, and metolachlor use decreased by 55 percent. Previous studies have documented that herbicide flushes occur in midwestern streams during runoff events for several weeks to several months following application, and that herbicide concentrations in midwestern streams during flushing events are related to rates of herbicide use.

The objective of this study is to determine the distribution of glyphosate and its primary transformation product aminomethylphosphonic acid (AMPA) in midwestern streams during post-application and harvest-season runoff events. Water samples will be collected in 2002 during two post-herbicide-application runoff events and one harvest-season runoff event from 53 sites on streams in the Midwestern United States. All samples will be analyzed at the U.S. Geological Survey Organic Geochemistry Research Laboratory in Lawrence, Kansas, for glyphosate and 20 other herbicides. Samples will also be analyzed for a glyphosate transformation product (AMPA) and 26 other herbicide transformation products, using GC/MS or HPLC/MS. Selected samples will be analyzed for 36 antibiotics or antibiotic transformational products. Results from this study will represent the first broad-scale investigation of glyphosate and AMPA in U.S. water resources.


Table of Contents

Abstract

Introduction

Glyphosate Toxicity

Changes in Herbicide Use

Herbicide Transformation Products

Antibiotics in Streams

Work Plan

Objectives and Hypotheses

Sampling Sites

Sampling Schedule

Sampling Procedures.

Analytical Procedures

Quality Assurance

Data Analysis Methods and Reports

References Cited

Appendix

 

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