中文摘要：

选择四川攀枝花地区广泛分布的3种土壤,研究五价钒[V（Ⅴ）]与四价钒[V（Ⅳ）]在土壤中的吸附-解吸行为。分别运用Langmuir模型和Freundlich模型对V在黄棕壤、紫色土和水稻土中的等温吸附线进行拟合,计算出这2种价态的V在各土壤中的最大吸附量,比较不同土壤对不同价态V的吸附能力,同时分别分析3种土壤吸附平衡液与解吸液pH的变化。结果表明：（1）2种价态的V在3种土壤中的等温吸附线与两模型均基本吻合;（2）3种土壤对2种价态的V的吸附能力大小顺序一致,依次为：黄棕壤〉水稻土〉紫色土;（3）3种土壤对V（Ⅳ）的最大吸附量基本一致,但紫色土与水稻土对V（Ⅴ）的最大吸附量高于黄棕壤;（4）V（Ⅳ）在3种土壤中的解吸率高于V（Ⅴ）,最高可达48.93%;（5）V（Ⅴ）的吸附平衡液与解吸液pH均随V浓度增加呈上升趋势,而V（Ⅳ）的吸附平衡液与解吸液pH均随V（Ⅳ）浓度增加呈下降趋势,且3种土壤的吸附平衡液pH变化幅度较解吸液大。

英文摘要：

Adsorption-desorption behavior of V （Ⅴ） and V （Ⅳ） in three types of soils, which are widely distributed in Panzhihua area of Sichuan Province was studied. The maximum adsorption amounts of V （Ⅴ） and V （Ⅳ） in the tested soils were calculated, and pH changes of adsorption equilibrium as well as desorption solution of the tested soils were analyzed. Results indicated that the adsorption isotherm of V （Ⅴ） and V （ Ⅳ） in the tested soils can be well described by the Langmuir model and the Freundlich model. The ability of adsorption of V（ V ）and V（Ⅳ）in soils was in the order as yellow brown soil 〉 paddy soil 〉 purple soil. The maximum adsorption amounts of V （Ⅳ ） in the tested soils were similar, while the maximum amounts of V （ V ） adsorbed by paddy soil and purple soil were higher than that by yellow brown soil. The desorption rate of V（Ⅳ） was higher than V（Ⅴ） in the tested soils, up to 48.93%. pH of adsorption equilibrium and desorption solution of V（Ⅴ） increased with V （Ⅴ） concentration in soils, however V （ Ⅳ ） showed a decreasing trend, and pH changes of adsorption equilibrium were larger than the desorption solution.