Effects of organic modification on Cd2+ absorption characteristics in dry land soil
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DOI：10.7606/j.issn.1000-7601.2004.02.01
Key Words: rganic modification  Lou soil  BET model  thermodynamic parameters, Cadmium ion
Author NameAffiliation
MENG Zhao-fu College of Life Science Northwest Sci-Tech University of Agriculture and Forestry， Yangling，Shaanxi，712100，China 
ZHANG Yi-ping College of Resource and Environment Northwest Sci-Tech University of Agriculture and Forestry，Yangling，Shaanxi 712100，China 
WANG Guo-dong College of Life Science Northwest Sci-Tech University of Agriculture and Forestry， Yangling，Shaanxi，712100，China 
WANG Chao-feng College of Life Science Northwest Sci-Tech University of Agriculture and Forestry， Yangling，Shaanxi，712100，China 
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Abstract:
      The study was carried out to discover the Cd2+ absorption characteristics in the tillage layer of Lou soils modified with cetyltrimethylammonium bromide (CTMAB) at various ratio and cetyltrimethylammonium bromide + sodium dodecylsulphonate (CTMAB+SDS) mixture. The results show that the order of absorption amount of Cd2+ is: unmodified tillage layer soil> 50%CTMAB > 100%CTMAB+20%SDS >100%CTMAB, and the absorption amount increases with the rise of temperature. The BET model is the best model which can be used to describe the Cd2+ absorption isotherm. The results of thermodynamic parameters show that the spontaneity of Cd2+ absorption in modified soil has the same variation trend as Cd2+ absorption amount and is decided by both enthalpy and entropy. The mechanism of Cd2+ absorption in modified soil is discussed with thermodynamic parameters.
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