土壤矿物对金属离子的临界吸附量  

Critical Adsorption Capability of Metal Ions on Soil Minerals

作　　者：郑佳[1] 王长秋[1] 鲁安怀[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871

出　　处：《矿物岩石地球化学通报》2006年第4期381-387,共7页Bulletin of Mineralogy, Petrology and Geochemistry

基　　金：国家重大基础研究前期研究专项基金资助项目(2001CCA02400)

摘　　要：本文从矿物表面羟基与溶液中金属离子反应的化学平衡方程出发,得到金属离子在矿物表面单基配位和双基配位吸附的覆盖度计算公式,并据此探讨了覆盖度的影响因素和变化规律,指出覆盖度随pH变化曲线拐点的实际意义。假设土壤和地表水达到平衡,参比水质标准,提出了矿物吸附金属离子的临界覆盖度公式,并初步探讨了石英吸附Cd2+的临界覆盖度-pH曲线,进而推导出土壤矿物对金属离子的临界吸附量公式。Based on the chemical equilibrium equation of mineral surface hydroxyls reacting with metal ions in solution, this paper has built calculation formulas of the cover rates for adsorbing metal ions on mineral surface by monoradial and biradical ligands adsorption models, discussed the variation regularities and influence factors of the cover rate, pointed out the practical significances of the inflexion in curves of cover rates versus pH values. Assuming water and soil is equilibrated, with the reference of the surface water body quality standard, this paper has proposed a formula of the critical cover rate for heavy metals adsorbed on soil minerals, has initially discussed the curve of critical cover rate versus pH values for the quartz adsorbing Cd^2＋ , and then has deduced a formula of the critical adsorption of metal ions adsorbed on surface of soil minerals.

关 键 词：矿物 金属离子 覆盖度 临界吸附量 

分 类 号：P579[天文地球—矿物学]