4种矿物材料改良Cd污染土壤的研究

以钠基膨润土、膨润土、沸石、硅藻土等4种矿物为改良材料,在潮褐土中添加外源水溶性Cd化合物模拟Cd污染的土壤,以油菜为指示植物,探讨了4种矿物材料对Cd污染土壤的改良效果及存在的规律。结果表明:钠基膨润土、膨润土、沸石、硅藻土的添加量分别为20、30、50、40 g/kg时,土壤有效态Cd含量分别达到了相应最低浓度,比对照分别降低了21.40%、27.63%、27.24%、32.30%;在修复Cd污染土壤时各种矿物的施用量以30~40 g/kg为宜,至少可降低油菜Cd吸收量的15%;添加4种矿物材料均可以提高土壤的pH值,降低土壤Cd活性,并可以在不同程度上迅速降低土壤速效养分含量,从而抑制油菜对土壤Cd的吸收。

Study on remediation of the soil contaminated with Cadmium by applying four minerals

Effects of in situ immobilization by applying 4 materials were systematically studied to remedy Cd contaminated soil in pot experiment with rape as indicator plant.The minerals of Na-modified bentonite,bentonite,zeolite and diatomite were used in the experiment.The results showed that when the added amount of Na-modified bentonite,bentonite,zeolite and diatomite was 20,30,50,40 g/kg respectively,the effective Cd content of soil reached the corresponding minimum concentration separately and reduced by 21.40%...