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

用十三陵水库的底泥进行对Cr^(3+)和Cr_2O_7^(2-)离子的吸附及解吸的实验,得出结论:Cr_2O_7^(2-)离子基本上不被底泥吸附,而Cr^(3+)离子被强烈吸附,并且难于解吸。

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) (Cr2O72-) separately by means of colorimetric analysis.The results show that the substrate sludge has nearly no adsorbing ability to Cr2O72-,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 Cr + could hardly be desorbed.