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This article in JEQ

  1. Vol. 23 No. 3, p. 549-556
     
    Received: Apr 12, 1993
    Published: May, 1994


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doi:10.2134/jeq1994.00472425002300030021x

Adsorption and Desorption of Atrazine and Deethylatrazine by Low Organic Carbon Geologic Materials

  1. W. R. Roy * and
  2. I. G. Krapac
  1. Illinois State Geological Survey, 615 East Peabody Drive, Champaign, IL 61820.

Abstract

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 Koc 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 Kd 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.

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