Adsorption and desorption of three carbamate pesticides by illite, kaolinite and humic acid-clay complexes

JOURNAL OF ADVANCES IN CHEMISTRY

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Title Adsorption and desorption of three carbamate pesticides by illite, kaolinite and humic acid-clay complexes
 
Creator Bansal, O. P.
 
Subject Chemistry: Environmental Chemistry
Clay minerals; Freundlich isotherms; organic matter; oxamyl; pesticides
 
Description In soils organic matter and clay minerals are often so associated that it is not clear that how the presence of organic matter influences the sorptive process of clay minerals.  So, in order to factor and quantify component contributions of mineral fractions and humic acid phase to the sorption of pesticides on clay minerals, adsorption and desorption of three carbamate pesticides oxamyl (I), S-Ethyl-N-(methyl carbamoyl)-oxythio acetimidate (II) and N-Phenyl (ethyl cabamoyl) propylcarbamate (III) by Na+, Ca2+ saturated illite, kaolinite and humic acid-clay complexes were investigated by batch experiments. The adsorption was more on illite than kaolinite and followed the order pesticide III > I > II, adsorption on Na-saturated clay samples was more than Ca-saturated. The presence of humic acid enhances the pesticide adsorption. A composite model for estimating pesticide adsorption, which assumes mineral and organic matter fraction individually as adsorbent phases, predicted sorption within a factor of 0.75-1.4 times the measured value. The desorption data indicated that humic acid retains more pesticide than clay mineral. XRD patterns showed that humic acid is restricted to the external surfaces of clay tactoids, denoting that clay mineral fractions in soils including those with organic coatings play an important role in the retention of polar carbamate pesticides.
 
Publisher CIRWORLD
 
Date 2014-05-01
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://cirworld.com/index.php/jac/article/view/896
 
Source JOURNAL OF ADVANCES IN CHEMISTRY; Vol 10 No 4; 2585-2591
2321-807X
 
Language eng
 
Relation http://cirworld.com/index.php/jac/article/view/896/876
 
Rights Copyright (c) 2016 JOURNAL OF ADVANCES IN CHEMISTRY
 

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