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Adsorption and desorption of atrazine and deethylatrazine by low organic carbon geologic materials

Journal of Environmental Quality

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Abstract

The adsorption and desorption of atrazine (2-chloro-4-ethylamino-6- isopropylamino-s-triazine) and a primary metabolite, deethylatrazine (2- amino-4-chloro-6-isopropylamino-s-triazine; DEA), by low organic C (??? 3.3 g kg-1) materials were measured by batch-equilibrium techniques. The adsorbents were samples of glacial outwash sand, till, and stream sediments. The adsorption of both atrazine and DEA conformed to linear isotherms. The adsorption of atrazine by most of the adsorbents yielded apparent K(oc) values that were in excess of those based on surface agricultural soils. Adsorption correlated with only the pH of the sand-water suspensions. The desorption of atrazine was hysteretic under the conditions of the measurement. DEA had a lower affinity for the same adsorbents; the mean ratio of K(d) values of DEA to those of atrazine was 0.37 ?? 0.20. DEA adsorption did not correlate with organic C, surface area, clay content of the adsorbents, or with the pH of the suspensions. DEA adsorption, unlike atrazine, tended to be reversible. There was a linear relationship between the adsorption constants of atrazine and those of DEA.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Adsorption and desorption of atrazine and deethylatrazine by low organic carbon geologic materials
Series title:
Journal of Environmental Quality
Volume
23
Issue:
3
Year Published:
1994
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Environmental Quality
First page:
549
Last page:
556
Number of Pages:
8