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Thermodynamics of chromium sorption in soil groups of India

Indian Agricultural Research Journals

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Title Thermodynamics of chromium sorption in soil groups of India
 
Creator ADHIKARI, TAPAN
SINGH, M V
 
Subject Soil chemistry, Chromium, Adsorption isothenns, Thennodynamic parameters, Heavy metal sorption, Soil properties
 
Description A laboratory experiment was conducted to study the thermodynamics of chromium sorption in major soil types, viz Typic Ustorthent, Typic Haplustalf, Typic Eutrochrept, Vertic Ustopept, Sodic Haplustert, representing 5 agroecological zones of india. The thermodynamic parameters, viz thermodynamic equilibrium constant (KD),. standard free energy (G0), standard enthalpy (HD) and standard entropy (SD) were determined by using sorption data and concentrations of Cr (VI) in equilibrium solution at 2 different temperatures at 25 ± 2oC and 45± 2oC of soil suspension. Data of Cr sorption could be described satisfactorily by Freundlich and modified LangmUIr Isotherms. The Cr sorption was maximum In order of Typic Ustorthent > Typic Haplustalf > Typic Eutrochrept > Vertic Ustopept > Sodic Haplustert. The Typic Ustorthent sorbed Cr 1.5 and 2.0 times more than the sorption by Vertic Ustopept and Sodic Haplustert soils respectively. Such variations in Cr sorption maxima were correlated with the differences in pH, cation-exchange capacity (CEC) and organic matter content of the soils. The high values of Go for Cr indicated that the reaction is spontaneous. The value of Ho were found negative for Cr indicating that Cr sorption reaction was exothermic in all the soils.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2014-06-06
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/41161
 
Source The Indian Journal of Agricultural Sciences; Vol 72, No 11 (2002)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/41161/18411
 
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