Effect of CPC,Brij-35, and SDBS Surfactants on the Adsorption and Movement of Carbofuran in Indian Soils |
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Authors: | R P Singh N U Khan Garima Srivastava |
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Institution: | 1. Laboratories of Soil Science , Department of Botany, Faculty of Life Sciences, Aligarh Muslim University , Aligarh , India;2. Department of Chemistry , Faculty of Science, Aligarh Muslim University , Aligarh , India |
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Abstract: | Laboratory studies were conducted to determine adsorption and movement of carbofuran in aqueous surfactant-free and surfactant (cationic, cetyl pyridinium chloride (CPC), non-ionic, polyoxyethylene lauryl ether (Brij-35) and anionic, sodium dodecyl benezene sulphonate (SDBS)] solutions of different critical micellar concentrations (1/2 × CMC, 1.0 × CMC, and 2 × CMC) in four different Indian soils using batch shake and soil thin layer chromatography (soil TLC) techniques. The measured equilibrium adsorption isotherms were in agreement with the Freundlich equation. Higher adsorption of carbofuran in both systems was observed on FRI silt loam (FSL) soil followed by Alampur silt loam (ASL), Kalai loam (KL), and Bhoran sandy loam (BSL) soils, as anticipated from Freundlich constant KF and distribution coefficient KD, in surfactant-free systems and KF* and KD* in surfactant-soil-water systems. The adsorption of carbofuran in surfactant-soil-water systems followed the order cationic > anionic > non-ionic at all CMCs studied. The Rf values obtained from soil TLC studies confirmed the above order of adsorption. The KD and KD* values were used to evaluate remediation efficiency (KD*/KD) of surfactants. Non-ionic surfactant, Brij-35, and anionic surfactant, SDBS, are favorable for remediating soil contaminated with carbofuran as KD*/KD ratio is less than 1. |
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Keywords: | Carbofuran surfactants adsorption soil thin layer chromatography remediation efficiency |
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