Work Plan for Determining the Occurrence of Glyphosate, Its Transformation Product AMPA, Other Herbicide Compounds, and Antibiotics in Midwestern United States Streams, 2002By W.A. Battaglin, E.M. Thurman, D.W. Kolpin, E.A. Scribner, M.W. Sandstrom, and K.M. KuivilaAvailable from the U.S. Geological Survey, Branch of Information Services, Box 25286, Denver Federal Center, Denver, CO 80225, USGS Open-File Report 0369, 18 p., 2 figs. This document also is available in pdf format:
OFR 0369.pdf (852 K) AbstractChanges 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 ContentsAbstract 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
|
|
AccessibilityFOIAPrivacyPolicies and Notices | |