离子强度对恒电荷土壤胶体吸附Cu2+和Pb2+ 的影响
IONIC STRENGTH EFFECTS ON CU2+, Pb2+ ADSORPTIONIN CONSTANT CHARGE SOIL COLLOIDS
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摘要: 采用平衡法研究了离子强度、表面电位对恒电荷土壤胶体吸附Cu2+和Pb2+的影响。结果表明,离子强度越小,表面电位越高,土壤胶体对Cu2+和Pb2+的吸附量越大。在离子强度小于1.0mol·kg-1范围内,土壤胶体对Cu2+和Pb2+的吸附包括静电吸附和专性吸附；离子强度大于1.0mol·kg-1以后,土壤胶体对Cu2+和Pb2+的吸附受专性吸附控制。Abstract: Equilibrium method was applied to investigate effect of iom'c strength and surface potential on Cu2+, Pb2+ adsorption in soil colloids. Results showed that the lower ionic strength was, the higher surface potential was, the larger Cu2+, Pb2+ adsorbed amount in soil colloids was. Ad-sorption included specific adsorption and electrostatic adsorption when ionic strength was low to 1.0 mol kg-1,whereas, adsorption of Cu2+, Pb2+ on soil colloids was controlled by specific adsorp-tion.
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Key words:
- constant charge soil colloid /
- ionic strength /
- adsorption /
- copper /
- lead
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