中文摘要：

研究了不同pH条件下红壤和黄土对毒害重金属铊的等温吸附一解吸行为，结果表明，T1＋在红壤和黄土中的吸附量均受pH值影响明显。红壤中，在pH=2时吸附量最小，吸附率为3％，吸附量和吸附率随着pH的升高而增加，在pH=10时，吸附量为89．93mg／kg，吸附率为61．3％；黄土中，pH从4增加到6时，吸附率增加明显，从14%骤升至71．2％，pH=10时，最大吸附量为139．67mg／kg，吸附率最大为83．8‰红壤和黄土的吸附都符合Langmuir和Ternkin方程。解吸过程中，pH=2时，红壤和黄土的解吸率最高，并且解吸率随着初始浓度的增加而增大，最大分别达到78．696和85．2％，同等条件下，黄土的解吸率高于红壤；在pH=4-10，红壤的解吸有一定的滞后现象，而黄土解吸量随吸附量的增加近似线性增加，无明显滞后现象。

英文摘要：

The isotherm adsorption and desorption behaviors of thallium in red soil and loess under different pH were studied. Results indicated that the adsorption amount of T1＋ in two soils was significantly affected by pH. In red soil, the adsorption amount of T1＋ was the least of 3% at pH 2, and adsorption amount and adsorption rate were increased with increasing pH. The adsorption amount and adsorption rate were 89.93 mg/kg and 61.3% at pH 10 respectively. In loess, the adsorption rate increased obviously with increasing pH from 4 to 6, and upsurged from 14% to 71.2%. The .maximum absorbance and adsorption rate were 139.67 mg/kg and 83.8% respectively at pH 10. The adsorption of T1＋ in two soils could be described by Langmuir and Temkin isotherm equation satisfactorily. The desorption rate of T1＋ was the most at pH 2 in two soils, and it increased with increasing initial concentration of T1＋ up to the maximum of 78.6% and 85.2% respectively. The desorption rate of T1 ＋ in loess was higher than that in red soil at the same condition. The desorption of T1＋ in red soil exhibited hysteresis at pH 4-10, but in loess without obvious hysteresis, the amount of adsorption and desorption were approximate linear.