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- Title
Kinetics of sorption-desorption of benfuracarb insecticide in mollisols.
- Authors
Srivastava, Anjana; Chandra, Raju; Srivastava, Prakash Chandra
- Abstract
BACKGROUND: Sorption-desorption processes govern the movement of pesticides in soil. These processes determine the potential hazard of the pesticide in a given environment for groundwater contamination and need to be investigated. RESULTS: In the present study, sorption-desorption processes of benfuracarb were investigated using a batch method in two mollisols. The kinetics of benfuracarb sorption in mollisols conformed to two-compartment (1 + 1) first-order kinetics. The fast sorption rate constant was about 3 times higher for silt loam than for loam soil. However, the slow sorption rate constants were statistically similar for both soils. The concentration-dependent sorption-desorption isotherms of benfuracarb could not closely conform to the Freundlich isotherm in mollisols of high organic C content. The computed values of both the sorption (log K) and desorption (log K′) capacities were higher for silt loam than for loam soil. The desorption index ( n′/ n) values in the range 30.0-41.3 indicated poor reversibility of sorbed benfuracarb in mollisols. CONCLUSION: In view of the strong sorption of benfuracarb in mollisols with only partial desorption, the possibility of the leaching of soil-applied benfuracarb to contaminate groundwaters appears to be low. Copyright © 2010 Society of Chemical Industry
- Subjects
SOIL absorption &; adsorption; DESORPTION; INSECTICIDES &; the environment; GROUNDWATER pollution; ANALYTICAL mechanics
- Publication
Pest Management Science, 2011, Vol 67, Issue 2, p209
- ISSN
1526-498X
- Publication type
Article
- DOI
10.1002/ps.2053