[Effect of pH on copper sorption by the loess and its species].
[Effect of pH on copper sorption by the loess and its species].
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发表时间：
2001-05
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通讯作者：
W. Sun;R. Zhao;L. Zhang;B. Deng;J. Ni
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作者：
W. Sun;R. Zhao;L. Zhang;B. Deng;J. Ni
以黄土为吸附剂，石英为对照，研究了pH对铜吸附及形态的影响。吸附量-pH曲线均呈现出3个区域，即在低pH时吸附量缓慢增加，然后随pH的升高而迅速增加，在高pH时达到最大值;在Cu浓度不变时，吸附态、交换态和碳酸盐结合态Cu随泥沙浓度的增加而减少，在泥沙浓度不变时，吸附态、交换态和碳酸盐结合态Cu随泥沙浓度的增加而增加。MINTEQA 2模型结果表明，黄土和石英的沉淀物比例和组成不同，沉淀物比例随黄土浓度的增加而减小。
To study the effect of pH on copper sorption and species, loess was taken as sorbent in this research, and control experiments were conducted with quartz. All the curves of sorption amount-pH showed three regions, namely, sorption amount increased slowly at low pH, then increased quickly with the rise of pH, and reached the maximum amount at high pH. Copper of sorbed, exchangeable and bound to carbonate decreased with the increase in sediment concentration at constant Cu concentration, and increased with the increase in Cu concentration at constant sediment concentration. The MINTEQA2 model results showed that the proportions of precipitates and their compositions were different for loess and quartz, and the proportions of precipitates decreased with the concentrations of loess.