中文摘要：

研究了土壤有机质对Tl＋在红壤和黄土2种土壤中的吸附-解吸行为的影响。结果表明,去除土壤有机质后红壤和黄土对Tl＋的吸附量均明显下降,下降幅度最高分别达到24.7%和28.2%,黄土的下降幅度大于红壤;黄土对Tl＋吸附率最高下降幅度约为20%,也高于红壤的15%。土壤有机质对Tl＋吸附的贡献率平均值分别是黄土39.2%、红壤32.8%。2种土壤对Tl＋的解吸量在去除有机质之后都明显增大,在初始Tl＋浓度较高的情况下,增大幅度明显;并且Tl＋的初始浓度越高,土壤在去有机质前后的解吸率相差就越大,在Tl＋最大处理浓度为20 mg/L时,红壤和黄土的解吸率增加分别达到60.8%和65.5%。

英文摘要：

The effects of present organic matter in red soil and loess on the Tl＋ adsorption-desorption behaviors were investigated.The results showed that the adsorption of Tl＋ by both red soil and loess was remarkabley decreased after the removal of soil organic matter（SOM）.The reduce in Tl＋ adsorption capacity varied with different initial Tl＋ concentrations,and the greatest degree was 24.7% and 28.2% for red soil and loess,respectively.The greatest decrease degree in Tl＋ adsorption rate by loess was about 20%,which was higher than that by red soil.The contribution of SOM to the Tl＋ adsorption by loess and red soil was 39.2% and 32.8%,respectively.In addition,the desorption of Tl＋ from both loess and red soil was enhanced after the removal of SOM,particularly for high initial Tl＋ concentration.When the initial Tl＋ concentration was 20 mg/L,the desorption rate increased to 60.8% and 65.5% for red soil and loess,respectively.