Sorbed atrazine shifts into non-desorbable sites of soil organic matter during aging

Water Research
Jeong-Hun ParkStephen A Boyd

Abstract

Soil-chemical contact time (aging) is an important determinant of the sorption and desorption characteristics of the organic contaminants and pesticides in the environment. The effects of aging on mechanism-specific sorption and desorption of atrazine were studied in soil and clay slurries. Sorption isotherm and desorption kinetic experiments were performed, and soil-water distribution coefficients and desorption rate parameters were evaluated using linear and non-linear sorption equations and a three-site desorption model, respectively. Aging time for sorption of atrazine in sterilized soil and clay slurries ranged from 2 days to 8 months. Atrazine sorption isotherms were nearly linear (r(2)>0.97) and sorption coefficients were strongly correlated to soil organic carbon content. Sorption distribution coefficients (K(d)) increased with increase in age in all five soils studied, but not for K-montmorillonite. Sorption non-linearity did not increase with increase in age except for the Houghton muck soil. Desorption profiles were well described by the three-site desorption model. The equilibrium site fraction (f(eq)) decreased and the non-desorbable site fraction (f(nd)) increased as a function of aging time in all soils. For K-mo...Continue Reading

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Citations

Aug 15, 2015·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Olli H TuovinenMark Radosevich
Nov 26, 2013·Environmental Science and Pollution Research International·Luchun DuanMallavarapu Megharaj
Apr 7, 2016·Journal of Agricultural and Food Chemistry·Carmen TrigoWilliam C Koskinen
Mar 26, 2011·Environmental Science & Technology·Cheng GuStephen A Boyd
Nov 26, 2009·Journal of Separation Science·Diana L D LimaValdemar I Esteves
Jan 15, 2009·Journal of Environmental Quality·Weichun YangWei Chen
Dec 5, 2018·Journal of Environmental Quality·Ling OuMatthew L Polizzotto
Mar 12, 2020·Environmental Science and Pollution Research International·Junguang LiuDongyang Wei
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Apr 17, 2009·Environmental Science & Technology·Yu YangJay Gan
Aug 8, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Mohammad I Al-WabelAbdullah S F Al-Farraj

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