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环境化学  2015 

基于Zeta电位的水稻土吸附Pb(Ⅱ)和Cd(Ⅱ)能力的比较

Keywords: Zeta电位,重金属,专性吸附,解吸,水稻土

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Abstract:

测定了3种水稻土胶体在不同Cd/Pb摩尔比的悬液体系中的Zeta电位,并与2种重金属离子在土壤中的吸附量和解吸量进行比较,当Cd/Pb摩尔比为14时,Zeta电位数值最高;Cd/Pb摩尔比为11时Zeta电位数值居中;Cd/Pb摩尔比为41时Zeta电位数值最小,因此,Pb(Ⅱ)在三种土壤表面发生专性吸附的能力均大于Cd(Ⅱ),这与土壤中Pb(Ⅱ)和Cd(Ⅱ)的吸附量和解吸量的结果相一致.

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