中文摘要：

通过室内模拟实验研究了草炭对cd2＋的典型吸附特征，以及添加草炭对cd污染土壤中其浸出毒性和存在形态的影响。结果表明，溶液pH为3～6时，草炭对cd2＋的吸附量随着pH升高而增加，pH为6～8时草炭对cd2＋的吸附量趋于平稳；当溶液体系cd2＋初始质量浓度不超过800mg／l。时，草炭对cd2＋的吸附未达到平衡，其吸附率随cd2＋初始浓度的增大而由98．60％降低至88．53％；草炭对cd2＋的等温吸附行为可用Langmuir、Freundlich方程拟合，r均达到极显著水平；添加草炭能降低轻污染（总cd为3．0mg／kg）土样中cd2＋浸出量，cd2＋钝化率随草炭添加量增加而增加；相对较低（1％～2％，质量分数，下同）的草炭添加量对重污染（总Cd为6．0mg／kg）土样中的cd2＋表现出活化效果，导致cd2＋浸出量增加；但较高（4％）的草炭添加量下，重污染土样中cd2＋的钝化率要明显大于轻污染土样；添加草炭能影响土样中Cd的存在形态。在2种污染程度的土样中添加草炭后，有效态、无机结合态和残留态Cd所占比例均降低，而有机结合态Cd所占比例均增加。

英文摘要：

The typical Cd2＋ adsorption characteristics of peat as well as its influence on leaching toxicity of Cd polluted soils were investigated through the laboratory simulation experiments. Results showed that when the solution pH ranged 36,the increase of pH value would enhance the Cd2＋ adsorption on peat, however the Cd2＋ adsorption quantity leveled off if keep increasing the solution pH to 68. The Cd2＋ adsorption rate decreased from 98.60%to 88.53% when increasing the initial Cd2＋ concentration from 50 mg/kg to 800 mg/kg. Isothermal adsorption of Cd2. on peat could be described by both Langmuir and Freundlich equation, the r of fitting equations reached very signifi cant level. Existence of peat would decrease the Cd2＋ leaching quantity of light polluted soil （Cd concentration was 3.0 mg/kg） ,the inactivation rate of Cd2＋ was positive correlated with peat adding amount. Relative lower peat con tent （1 % ,wt%） could active the Cd2＋ of heavy polluted soil （Cd concentration was 6.0 mg/kg） ,and consequent ly increase the Cd2＋ leaching quantity. Under the higher peat content of 4 G, the Cd2＋ inactivation rate of heavy pollu ted soil was obviously greater than that of light polluted soil;the addition of peat could influence the existing form of Cd in soil, the available Cd,inorganic bounded and residual Cd in two level polluted soil were all decreased after the addition of peat, while the proportion of organic bounded soil was increased.