About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in JEQ

  1. Vol. 20 No. 4, p. 815-822
     
    Received: Oct 1, 1990


    * Corresponding author(s):
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/jeq1991.00472425002000040018x

Nonequilibrium Sorption and Degradation of Three 2-Chloro-s-Triazine Herbicides in Soil-Water Systems

  1. A. P. Gamerdinger *,
  2. A. T. Lemley and
  3. R. J. Wagenet
  1. College of Human Ecology, Cornell Univ., Ithaca, NY 14853;
    College of Human Ecology, Cornell Univ., Ithaca, NY 14853;
    Dep. of Soil, Crop, and Atmospheric Sciences, Cornell Univ., Ithaca, NY 14853.

Abstract

Abstract

Miscible displacement techniques were used for the simultaneous study of nonequilibrium sorption and degradation of atrazine (2-chloro-4-etbylamino-6-isopropylamine-s-triazine), simazine (2-chloro-4,6-bis(ethylamino)-s-triazine), and cyanazine (2-(4-chloro-6-ethylamino)-s-triazine-2-ylamino-2-proprionitrile) on two central New York soils. A bicontinuum model, which considers sorption in two domains and includes a description of first-order degradation, was applied to describe experimentally determined breakthrough curves. Values of the equilibrium sorption constant, K, and first-order degradation rate constant, µ, were independently measured using batch and mass-balance techniques. Values of the sorption rate coefficient (fitted with a bicontinuum model) were inversely correlated with K, and were dependent on concentration and velocity. Estimates of the rate of atrazine degradation were on the same order, but slower when measured with miscible displacement vs. batch incubation techniques. The techniques presented in this study provide an opportunity to better quantify sorption and degradation parameters that are required in environmental fate models.

Contribution no. 2661 of the College of Resource Development, Univ. of Rhode Island, with support from Rhode Island Agric. Exp. Stn.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .