黄壤、棕壤对铬(Ⅵ)吸附特性的研究

Study on Adsorption Properties of Chromium(Ⅵ) in Yellow Soil and Brown Soil

通过振荡平衡法研究黄壤、棕壤对Cr(Ⅵ)的吸附行为,结果表明,在酸性条件下土壤对Cr(Ⅵ)的吸附量远高于碱性条件下的吸附量,随温度的升高黄壤、棕壤对Cr(Ⅵ)的吸附量增加。土壤本身理化性质不同,其对Cr(Ⅵ)的吸附量有很大差异;土壤吸附Cr(Ⅵ)量与游离铁铝氧化物及粘粒含量呈显著正相关,而与有机质及土壤p H值呈负相关。供试土壤等温吸附Cr(Ⅵ)量表现为黄壤>棕壤。随着土壤有机质含量的增加,土壤Cr(Ⅵ)的等温吸附平衡浓度下降,对Cr(Ⅵ)的吸附能力下降。

We performed a series of oscillation equilibrium experiments to simulate the adsorption behavior of Cr （VI）for the yellow soil and brown soil. The results show that under a acidic soil conditions,adsorption of Cr（VI）is far higher than that of in alkaline conditions. The Cr（VI）adsorption of yellow soil and brown soil rise with the tem-perature. The physical and chemical properties of soil are different,and its adsorption of Cr（VI）will be a big differ-ence. Soil adsorption amount of Cr（VI）was significantly positively related to the free iron/aluminum oxide and clay content,and negative associative to organic matter and pH. The adsorption of Cr（VI）in the isothermal tested was yel-low soil〉brown soil. With the increase of organic matter content,the concentration of Cr（VI）in the isothermal ad-sorption equilibrium experiments decreased,and the adsorption capacity of Cr（VI）was subdued too.