Premium
Co‐solvent effects on the adsorption of carbofuran by two Indian soils
Author(s) -
Singh Dhirendra
Publication year - 2000
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/(sici)1526-4998(200002)56:2<195::aid-ps85>3.0.co;2-4
Subject(s) - carbofuran , adsorption , chemistry , loam , freundlich equation , soil water , partition coefficient , leaching (pedology) , aqueous solution , methanol , solvent , environmental chemistry , chromatography , soil science , pesticide , organic chemistry , geology , agronomy , biology
The adsorption of carbofuran on soils from water‐methanol mixtures has been evaluated by batch shake testing. Two uncontaminated soils having different physicochemical properties were used in these experiments. The volume fraction of methanol in the liquid phase ( f s ) was varied from 0.25 to 1.0. Higher adsorption of carbofuran was observed in medium black (silt loam) soil than in alluvial (sandy loam) soil; calculated values of the Freundlich constant ( K m ) and distribution coefficient ( K d ) showed that adsorption of carbofuran in both soils decreased with increase in f S values. The decreased carbofuran adsorption in methanol–water mixtures meant a greater potential of ground‐water contamination through leaching from potential sites. The data have been used to evaluate the co‐solvent theory for describing adsorption of carbofuran in methanol–water mixtures. The aqueous phase partition coefficient K dw (mol g −1 ) normalized with respect to f oc and the aqueous phase adsorption constant K w for carbofuran were evaluated by extrapolating to f S = 0. © 2000 Society of Chemical Industry