Distribution of agrochemicals in the lower Mississippi River and its tributaries

Science of Total Environment
By: , and 

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Abstract

The Mississippi River and its tributaries drain extensive agricultural regions of the Mid-Continental United States. Millions of pounds of herbicides are applied annually in these areas to improve crop yields. Many of these compounds are transported into the river from point and nonpoint sources, and eventually are discharged into the Gulf of Mexico. Studies being conducted by the U.S. Geological Survey along the lower Mississippi River and its major tributaries, representing a 2000 km river reach, have confirmed that several triazine and acetanilide herbicides and their degradation products are ubiquitous in this riverine system. These compounds include atrazine and its degradation products desethyl and desisopropylatrazine, cyanazine, simazine, metolachlor, and alachlor and its degradation products 2-chloro-2',6'-diethylacetanilide, 2-hydroxy-2',6-diethylacetanilide and 2,6-diethylaniline. Loads of these compounds were determined at 16 different sampling stations. Stream-load calculations provided information concerning (a) conservative or nonconservative behavior of herbicides; (b) point sources or nonpoint sources; (c) validation of sampling techniques; and (d) transport past each sampling station.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Distribution of agrochemicals in the lower Mississippi River and its tributaries
Series title Science of Total Environment
DOI 10.1016/0048-9697(90)90229-N
Volume 97-98
Year Published 1990
Language English
Publisher Elsevier
Contributing office(s) Toxic Substances Hydrology Program
Description 13 p.
First page 41
Last page 53
Country United States
Other Geospatial Lower Mississippi River
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