title: Kinetics of sorption-desorption of benfuracarb insecticide in mollisols.
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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: GB Pant University of Agriculture and Technology-Soil Science, College of Agriculture, Pantnagar, Uttarakhand, India. anj612003@yahoo.co.in
authors.forename: Anjana
authors.initials: A
authors.lastname: Srivastava
authors.forename: Raju
authors.initials: R
authors.lastname: Chandra
authors.forename: Prakash Chandra
authors.initials: PC
authors.lastname: Srivastava
mesh_terms: D000327:Adsorption; D001572:Benzofurans / Q000737:chemistry*; D007306:Insecticides / Q000737:chemistry*; D007700:Kinetics; D012987:Soil / Q000032:analysis*; D012989:Soil Pollutants / Q000737:chemistry*; D015091:beta-Alanine / Q000031:analogs & derivatives* / Q000737:chemistry
chemical_list: D001572:Benzofurans; D007306:Insecticides; D012987:Soil; D012989:Soil Pollutants; D015091:beta-Alanine; C096128:benfuracarb