十三陵水库的底泥对铬离子的吸附和解吸

Adsorption and Desorption of Cr(Ⅲ) and (Ⅵ) by Substrate Sludge of Ming Tombs Reservoir

摘要: 用十三陵水库的底泥进行对Cr³⁺和Cr₂O₇^2-离子的吸附及解吸的实验,得出结论:Cr₂O₇^2-离子基本上不被底泥吸附,而Cr³⁺离子被强烈吸附,并且难于解吸。

Abstract: The authors collected samples of the substrate sludge from different places of Ming Tombs Reservoir (in the suburb of Beijing),and tested their adsorption and desorption to Cr(Ⅲ)(Cr³⁺) and Cr(Ⅵ)(Cr₂O₇^2-) separately by means of colorimetric analysis.The results show that the substrate sludge has nearly no adsorbing ability to Cr₂O₇^2-,the adsorption rate is only 1~3%;On the contrary,the adsorbing ability to Cr³⁺ is exceedingly strong,the adsorption rate is 35~66%,and the desorption rate is only 1~6%.This reveals that the adsorbed Cr³⁺ could hardly be desorbed.