Synthetic organic agrochemicals in the lower Mississippi River and its major tributaries--Distribution, transport and fate

Journal of Contaminant Hydrology
By: , and 

Links

Abstract

The Mississippi River and its major tributaries transport herbicides and their degradation products from agricultural areas in the mid-western U.S.A. These compounds include atrazine and its degradation products (desethyl- and desisopropylatrazine), simazine, cyanazine, metolachlor, and alachlor and its degradation products (2-chloro-2′,6′-diethylacetanilide 2-hydroxy-2′,6′-diethylacetanilide and 2,6-diethylaniline). These compounds were identified and confirmed by gas chromatography-ion trap mass spectrometry. Loads of these compounds were determined during five sampling trips in 1987–1989. Stream loads of these compounds indicated that atrazine and metolachlor were relatively conservative in downstream transport. Alachlor and its degradation products were generated from point and non-point sources. Seasonal variations and hydrologic conditions controlled the loads of these compounds in the Mississippi River. Cross-channel mixing was slow downstream from major river confluences, possibly requiring several hundred kilometers of downriver transit for completion. The annual transport of these compounds into the Gulf of Mexico was estimated to be < 2% of the annual application of each herbicide in the Midwest.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Synthetic organic agrochemicals in the lower Mississippi River and its major tributaries--Distribution, transport and fate
Series title Journal of Contaminant Hydrology
DOI 10.1016/0169-7722(92)90057-L
Volume 9
Issue 1-2
Year Published 1992
Language English
Publisher Elsevier
Contributing office(s) Toxic Substances Hydrology Program
Description 14 p.
First page 175
Last page 188
Google Analytic Metrics Metrics page
Additional metadata about this publication, not found in other parts of the page is in this table