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Article
Occurrence of Atrazine and Degradates as Contaminants of Subsurface Drainage and Shallow Groundwater
Journal of Environmental Quality
  • K. Jayachandran, United States Department of Agriculture
  • T. R. Steinheimer, United States Department of Agriculture
  • L. Somadunaran, Du Pont Agricultural Products
  • Thomas B. Moorman, United States Department of Agriculture
  • Ramesh S. Kanwar, Iowa State University
  • Joel R. Coats, Iowa State University
Document Type
Article
Publication Date
3-1-1994
DOI
10.2134/jeq1994.00472425002300020014x
Abstract
Atrazine is a commonly used herbicide in corn (Zea mays L.) growing areas of the USA. Because of its heavy usage, moderate persistence, and mobility in soil, monitoring of atrazine movement under field conditions is essential to assess its potential to contaminate groundwater. Concentrations of atrazine, deisopropylatrazine (DIA), and deethylatrazine (DEA) were measured in subsurface drainage and shallow groundwater beneath continuous, no-till corn. Water samples were collected from the subsurface drain (tile) outlets and suction lysimeters in the growing seasons of 1990 and 1991, and analyzed for atrazine and two principle degradates using solid-phase extraction and HPLC. In 1990, atrazine concentration ranged from 1.3 to 5.1 µg L−1 in tile-drain water and from 0.5 to 20.5 µg L−1 in lysimeter water. In general, concentrations of parent and degradates in solution were atrazine > DEA > DIA. Lesser levels of atrazine were measured in 1991 from Plots 2 and 4; however, greater concentrations of atrazine (6.0–8.4 µg L−1) were measured from Plot 5. Throughout the two growing seasons, atrazine concentration in Plot 5 tile-drain water was greater than that of Plots 2 and 4, suggesting a preferential movement of atrazine. Concentrations of DIA and DEA ranged from 0.1 to 2.2 and 0.9 to 3.2 µg L−1, respectively, indicating that the degradation products by themselves or in combination with parent atrazine can exceed the maximum contaminant level (mcl) of 3 µg L−1 even though atrazine by itself may be <3 µg L−1. The deethylatrazineto-atrazine ratio (DAR) is an indicator of residence time in soil during transport of atrazine to groundwater. In Plots 2 and 4, DAR values for tile-drain water ranged from 0.43 to 2.70 and 0.50 to 2.66, respectively. By comparison, a DAR of 0.38 to 0.60 was observed in Plot 5, suggesting less residence time in the soil.
Comments

This article is from JEQ 23 (1994): 311–319, doi:10.2134/jeq1994.00472425002300020014x.

Rights
Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.
Language
en
File Format
application/pdf
Citation Information
K. Jayachandran, T. R. Steinheimer, L. Somadunaran, Thomas B. Moorman, et al.. "Occurrence of Atrazine and Degradates as Contaminants of Subsurface Drainage and Shallow Groundwater" Journal of Environmental Quality Vol. 23 Iss. 2 (1994) p. 311 - 319
Available at: http://works.bepress.com/joel_coats/2/