Researchers with the U.S. Geological Survey (USGS) recently investigated 51 streams in nine Midwestern States to determine the presence of a wide range of herbicides, their degradation byproducts and antibiotics. Herbicides were detected in most water samples, which were collected to coincide with runoff events following herbicide application, but antibiotics were detected in only 1 percent of the samples.
What's New
USGS scientists have conducted periodic studies of herbicide occurrence in midwestern streams since 1989 to measure changes in pesticide levels in water resources caused by changing pesticide use and the introduction of new pesticides. Recently, the USGS developed new methods to measure low-levels of glyphosate and antibiotics in environmental waters. The 2002 study is the first to look for the broad-spectrum herbicide glyphosate, its primary degradation product aminomethylphosphonic acid (AMPA), as well as antibiotics during runoff events in Midwestern streams.
What is Glyphosate?
Glyphosate (tradenames include Roundup©, Touchdown©, Rodeo©, and others) is an organic solid of odorless white crystals. It is a non-selective herbicide used on many food and non-food crops as well as non-crop areas such as roadsides. When applied at lower rates, it serves as a plant growth regulator. The most common uses include control of broadleaf weeds and grasses in: hay/pasture, soybeans, field corn; ornamentals, lawns, turf, forest plantings, greenhouses, rights-of-way. Glyphosate is currently the world's best selling herbicide, used in more than 90 countries and on more than 150 crops. Glyphosate use in agriculture has tripled since 1997, largely due to the increasing popularity of Roundup Ready® crops† (including corn and soybeans), which have been genetically modified to tolerate glyphosate. The U.S. Environmental Protection Agency has set a drinking water Maximum Contaminant Level (MCL) of 700 micrograms per liter for glyphosate.
What was found?
A total of 154 water samples were collected during the 2002 study in nine Midwestern States. Glyphosate was detected in 36 percent of the samples, while its degradation product, aminomethylphosphonic acid (AMPA) was detected in 69 percent of the samples. The highest measured concentration of glyphosate was 8.7 micrograms per liter, well below the MCL (700 micrograms per liter). The highest AMPA concentration was 3.6 micrograms per liter (there is no MCL for AMPA). Other herbicides were detected at low levels, below health standards, in most samples. Atrazine was detected at or above the 3 microgram per liter MCL in 30% of the samples. Atrazine concentrations were generally lower, however, than those found in previous USGS studies conducted in the 1990s.
Median concentrations (µg/L) detected for each runoff period are:
Pre-emergence | Post-emergence | Harvest season | |
---|---|---|---|
Atrazine | 4.2 | 1.1 | 0.12 |
Glyphosate | <0.10 | <0.10 | <0.10 |
AMPA | 0.10 | 0.27 | 0.21 |
The antibiotics, measured to determine if they also would attain peak concentrations during spring runoff events following pesticide application, were detected in only 1 percent of water samples. Of the 37 antibiotics tested, only sulfamethoxazole was detected in 2 samples.
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Related publications listed below.
Reconnaissance data for glyphosate, other selected herbicides, their degradation products, and antibiotics in 51 streams in nine midwestern states, 2002
Work plan for determining the occurrence of glyphosate, its transformation product AMPA, other herbicide compounds, and antibiotics in midwestern United States streams, 2002
Methods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group—Determination of glyphosate, aminomethylphosphonic acid, and glufonsinate in water using online solid-phase extraction and high-performance liquid chromatography/mass sp
- Overview
Researchers with the U.S. Geological Survey (USGS) recently investigated 51 streams in nine Midwestern States to determine the presence of a wide range of herbicides, their degradation byproducts and antibiotics. Herbicides were detected in most water samples, which were collected to coincide with runoff events following herbicide application, but antibiotics were detected in only 1 percent of the samples.
Glyphosate is frequently applied to corn and soybeans growing areas like these in Iowa What's New
USGS scientists have conducted periodic studies of herbicide occurrence in midwestern streams since 1989 to measure changes in pesticide levels in water resources caused by changing pesticide use and the introduction of new pesticides. Recently, the USGS developed new methods to measure low-levels of glyphosate and antibiotics in environmental waters. The 2002 study is the first to look for the broad-spectrum herbicide glyphosate, its primary degradation product aminomethylphosphonic acid (AMPA), as well as antibiotics during runoff events in Midwestern streams.
What is Glyphosate?
Glyphosate (tradenames include Roundup©, Touchdown©, Rodeo©, and others) is an organic solid of odorless white crystals. It is a non-selective herbicide used on many food and non-food crops as well as non-crop areas such as roadsides. When applied at lower rates, it serves as a plant growth regulator. The most common uses include control of broadleaf weeds and grasses in: hay/pasture, soybeans, field corn; ornamentals, lawns, turf, forest plantings, greenhouses, rights-of-way. Glyphosate is currently the world's best selling herbicide, used in more than 90 countries and on more than 150 crops. Glyphosate use in agriculture has tripled since 1997, largely due to the increasing popularity of Roundup Ready® crops† (including corn and soybeans), which have been genetically modified to tolerate glyphosate. The U.S. Environmental Protection Agency has set a drinking water Maximum Contaminant Level (MCL) of 700 micrograms per liter for glyphosate.
What was found?
A total of 154 water samples were collected during the 2002 study in nine Midwestern States. Glyphosate was detected in 36 percent of the samples, while its degradation product, aminomethylphosphonic acid (AMPA) was detected in 69 percent of the samples. The highest measured concentration of glyphosate was 8.7 micrograms per liter, well below the MCL (700 micrograms per liter). The highest AMPA concentration was 3.6 micrograms per liter (there is no MCL for AMPA). Other herbicides were detected at low levels, below health standards, in most samples. Atrazine was detected at or above the 3 microgram per liter MCL in 30% of the samples. Atrazine concentrations were generally lower, however, than those found in previous USGS studies conducted in the 1990s.
Median concentrations (µg/L) detected for each runoff period are:
Pre-emergence Post-emergence Harvest season Atrazine 4.2 1.1 0.12 Glyphosate <0.10 <0.10 <0.10 AMPA 0.10 0.27 0.21 The antibiotics, measured to determine if they also would attain peak concentrations during spring runoff events following pesticide application, were detected in only 1 percent of water samples. Of the 37 antibiotics tested, only sulfamethoxazole was detected in 2 samples.
- Science
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Related publications listed below.
Reconnaissance data for glyphosate, other selected herbicides, their degradation products, and antibiotics in 51 streams in nine midwestern states, 2002
Since 1989, the U.S. Geological Survey has conducted periodic reconnaissance studies of streams in the Midwestern United States to determine the geographic and seasonal distribution of herbicide compounds. These studies have documented that large amounts of acetochlor, alachlor, atrazine, cyanazine, metolachlor, and their degradation products are flushed into streams during post-application runoffWork plan for determining the occurrence of glyphosate, its transformation product AMPA, other herbicide compounds, and antibiotics in midwestern United States streams, 2002
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 metolMethods of analysis by the U.S. Geological Survey Organic Geochemistry Research Group—Determination of glyphosate, aminomethylphosphonic acid, and glufonsinate in water using online solid-phase extraction and high-performance liquid chromatography/mass sp
An analytical method for the determination of glyphosate, its principal degradation compound, aminomethylphosphonic acid (AMPA), and glufosinate in water with varying matrices has been developed. Four different sample matrices fortified at 0.2 and 2.0 μg/L (micrograms per liter) were analyzed using precolumn derivatization with 9-fluorenylmethylchloroformate (FMOC). After derivatization, cleanup a