中文摘要：

用平衡吸附法研究了不同浓度的有机酸（乙酸、酒石酸和柠檬酸）对针铁矿和膨润土吸附Cd^2＋、Pb^2＋的影响。结果表明：（1）低浓度（〈0．6mmolL^-1）有机酸促进供试矿物吸附Cd^2＋和Pb^2＋，随着有机酸浓度增加，吸附逐渐被抑制。高浓度（〉1．0mmolL^-1）有机酸对Pb^2＋吸附的抑制作用比对Cd^2＋的强。有机酸浓度的变化对针铁矿Cd^2＋、Pb^2＋吸附率的影响大于对膨润土的。（2）不同Cd^2＋浓度下，有机酸对膨润土Cd^2＋吸附强度的影响大于针铁矿。加入高浓度Cd^2＋（8．0mmolL^-1）时，低浓度有机酸对膨润土吸附Cd^2＋的促进作用比加入低浓度Cd^2＋（0．4mmolL^-1）时明显，高浓度有机酸对膨润土吸附Cd^2＋的抑制作用与低浓度Cd^2＋时相近。（3）低浓度有机酸（〈0．6mmolL^-1）时，酒石酸、柠檬酸对针铁矿吸附Cd^2＋的促进作用大于乙酸，而它们对膨润土吸附Cd^2＋的促进作用相似；在三种有机酸高浓度（〉1．0mmol L^-1）时，针铁矿对Cd^2＋的吸附都趋于稳定，而柠檬酸对膨润土吸附Cd^2＋的抑制作用比乙酸和酒石酸的明显。不同种类有机酸下，矿物对Pb^2＋吸附率大小的变化基本一致。

英文摘要：

Effects of organic acids （acetic acid, tartaric acid and citric acid） on adsorption of Cd^2＋ and Pb^2 ＋ by goethite and bentonite were studied with the batch method. The results show that Cd^2＋ and Pb^2＋ adsorption by the tested minerals was promoted by organic acids low in concentration （ 〈 0.6 mmol L^- 1 ）, whereas the adsorption was inhibited with the concentration of the organic acids rising. The inhibiting effect of the organic acids on Pb^2 ＋ adsorption by goethite and bentonite were stronger than on Cd^2＋ adsorption when the concentration was 〉 1.0 mmol L^-1. The effect of change in concentration of the organic acids on Cd^2＋ and Pb^2＋ adsorptions varied with minerals, and was more obvious on goethite than on bentonite. The effect of the organic acid on Cd^2 ＋ adsorption intensity on bentonite was greater than on goethite even if the concentration of added Cd^2 ＋ varied. The effect of low concentration organic acid promoting Cd^2 ＋ adsorption by bentonite was more obvious when the concentration of Cd^2 ＋ was high （8.0 mmol L^-1） than when it was low （0.4 mmol L^-1） , but the inhibiting effect of high concentration organic acids on Cd^2 ＋ adsorption by bentonite remain approximate whether the concentration of Cd^2 ＋ was high or low. The Cd^2 ＋ adsorption by goethite was more obviously promoted by tartaric acid and citric acid than by acetic acid when they were low in concentration （ 〈 0.6 mmol L^-1） , but the promoting effects of the three organic acids on Cd^2 ＋ adsorption by goethite were similar. When the concentrations （ 〉 1.0 mmol L^-1） of the organic acids were high, their effects on Cd^2 ＋ adsorption by goethite were stable, but the Cd^2 ＋ adsorption by bentonite was more obviously restricted by citric acid than by acetic acid or tartaric acid. The effects of the three kinds of organic acids on Pb^2＋ adsorption on two minerals were almost the same.