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ARS Home » Research » Publications at this Location » Publication #96516
Title: COULD SMECTITE CATALYZED HYDROLYSIS OF ATRAZINE CONTRIBUTE TO IRREVERSIBLE SORPTION?

Author
item HUNDAL, LAKHWINDER - IOWA STATE UNIVERSITY
item Laird, David

Submitted to: Agronomy Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 10/22/1998
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Hysteresis in sorption/desorption of atrazine on soils and clays has been attributed to physical processes such as slow diffusion into nanopores and entrapment in "glassy" organic matter phases. This study tests the alternative hypothesis that this phenomenon is due to abiotically catalyzed hydrolysis and irreversible binding of atrazine hydrolysis products. Effects of aging at 98% RH, wetting/drying cycles, and freezing/thawing cycles on hydrolysis kinetics were quantified by incubating atrazine with Ca-saturated reference clays. Atrazine and hydrolysis products were extracted from the samples using 60% DMSO in 0.01 M CaCl2 pH = 8.5 and quantified by HPLC. This extractant has been found to yield nearly quantitative recovery of atrazine hydrolysis products from clay samples. Preliminary results indicate the slow appearance of several hydrolysis products of atrazine that are not extractible with 0.01 M CaCl2.