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Sorption–desorption of cyanazine in three Mississippi delta soils

Published online by Cambridge University Press:  20 January 2017

Stephen M. Schraer ,
David R. Shaw ,
Michelle Boyette ,
William L. Kingery  and
Cliff H. Koger
Stephen M. Schraer
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Box 9555, Mississippi State, MS 39762
Michelle Boyette
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Box 9555, Mississippi State, MS 39762
William L. Kingery
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Box 9555, Mississippi State, MS 39762
Cliff H. Koger
Affiliation:
Southern Weed Science Research Unit, United States Department of Agriculture, Agricultural Research Service, Stoneville, MS 38776
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Abstract

Sorption and desorption of cyanazine with three Mississippi Delta soils (two silt loams and one silty clay) were studied under laboratory conditions. Cyanazine sorption calculated using the Freundlich equation was greatest for the Sharkey silty clay soil. Partition coefficients (Kd values) for cyanazine sorption ranged from 1.67 to 1.82, 1.92 to 2.15, and 3.65 to 3.96 ml g−1 for the Bosket silt loam, Dubbs silt loam, and Sharkey silty clay soils, respectively. Differences in sorption and Kd values were attributed to clay content. At a given initial cyanazine concentration, cyanazine was desorbed more readily from the silt loam soils than from the Sharkey clay after the first 4-h desorption cycle. Desorption from the Sharkey clay continued for a longer period than that from the silt loam soils, with up to 6% cyanazine desorption from the Sharkey clay after a 16-h desorption cycle compared with 0% for the silt loam soils. Cyanazine losses increased with decreasing clay content, Dubbs = Bosket > Sharkey. This implies a potential relationship between cyanazine desorption and surface runoff losses of cyanazine.

Keywords

CyanazinePesticidescation exchange capacityhigh-performance liquid chromatographysorption isotherm
Type
Research Article
Information
Weed Science , Volume 51 , Issue 4 , August 2003 , pp. 635 - 639
Copyright
Copyright © Weed Science Society of America 

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