Campus Units
Entomology
Document Type
Book Chapter
Publication Version
Published Version
Publication Date
6-21-1996
Journal or Book Title
Herbicide Metabolites in Surface Water and Groundwater
Volume
630
Issue
12
First Page
140
Last Page
150
DOI
10.1021/bk-1996-0630.ch012
Abstract
Several studies have been conducted to investigate the fate of atrazine (ATR, 2-chloro-4[ethylamino]-6[isopropylamino]-s-triazine) and major degradation products of ATR in soils of Iowa by using laboratory radiotracer studies, field lysimeters, and a field-scale approach. Complete metabolism studies of uniformly ring-labeled 14C-chemicals revealed some major trends. Persistence of ATR, deethylatrazine (DEA, 2-chloro-4[amino]-6[isopropylamino]-s-triazine), and deisopropylatrazine (DIA, 2-chloro-4[ethylamino]-6[amino]-s-triazine) was greater in subsurface soils than in surface soils. In surface soil of Ames, DEA and didealkylatrazine (DDA, 2-chloro-4,6-[diamino]-s-triazine) were predominant degradates of ATR after 60 d, and hydroxyatrazine (HYA, 2-hydroxy-4[ethylamino]-6[isopropylamino]-s-triazine) was the predominant degradate of ATR after 180 d. The persistence of ATR, DEA, and DIA was significantly reduced under saturated soil moisture conditions than in soils held at a moisture near field capacity. Relative mobilities of ATR and degradates in five Iowa soils (surface and subsurface), determined by soil thin-layer chromatography, indicate that DEA is more mobile than ATR. The relative mobilities of DIA, DDA, and ATR were similar. Also, laboratory studies with undisturbed soil columns are supportive of greater mobility of DEA than ATR. In a field-scale study investigating the mobility of ATR and its degradates, it was indicated that ATR degradation products by themselves, or in combination with the parent compound can exceed the maximum contaminant level (MCL) of 3 µg/L currently set for ATR alone. In ATR-applied field plots, DEA and DIA were detected along with ATR in tile drain water samples, with concentrations of DEA exceeding DIA. In Extrazine®- (a herbicide mixture of 67% cyanazine [CYA; 2-chloro-4-ethylamino-6-(1-cyano-1 methylethylamino)-s-triazine] and 21% ATR) -applied field lysimeters, the concentrations of DIA exceeded those of DEA.
Copyright Owner
American Chemical Society
Copyright Date
1996
Language
en
File Format
application/pdf
Recommended Citation
Kruger, Ellen L. and Coats, Joel R., "Fate of Atrazine and Atrazine Degradates in Soils of Iowa" (1996). Entomology Publications. 370.
https://lib.dr.iastate.edu/ent_pubs/370
Included in
Agronomy and Crop Sciences Commons, Entomology Commons, Environmental Health Commons, Plant Biology Commons
Comments
Reprinted (adapted) with permission from Herbicide Metabolites in Surface Water and Groundwater, 630(12); Doi: 10.1021/bk-1996-0630.ch012. 1996 American Chemical Society.