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Adsorption Characteristics of Cu and Cd on Two Kinds of Soil

Wang Guo(Department of Land & Environmental Science, FAU, Fuzhou 350002)  
The adsorption characteristics of Cu2+ and Cd2+ on two different kinds of soil collected from France was studied and the causes for the difference of adsorption characteristics between Cu2+ and Cd2+ were discussed.The adsorbing capacity and rate of adsorption of Cu2+ and Cd2+ were increasing while pH increased, and Cu2+ and Cd2+ were completely adsorbed when the pH was near 7.Cu2+ was more strongly adsorded than Cd2+ as reflected by the adsorbing capacity and the rate of adsorption.The above difference was mainly caused by the difference of hydrolysis,precipitation,the intensity of complexation with humus and the competition for adsorption sites with Ca2+ and H+ ions between Cu2+ and Cd2+.The adsorbing capacity and rate of adsorption of Cu2+ changed with pH more strikingly at low original concentrations than at high ones.Cd2+ showed a similar but less striking tendency of adsorption.This was attributed to the existence of two different kinds of adsorption sites.The Grignon soil adsorbed more Cu2+ and Cd2+ than the Bordeaux soil because the clay content, CEC and pH value of the former were all higher than the later.
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