摘要
本文着重讨论添加物紫云英、CaCO_3、膨润土对土壤提取液中Cu、Cd的降毒效应及其金属形态的影响。测试结果表明,添加CaCO_3对降低红壤水溶态Cu、Cd和0.1mol/L HCl可提取态Cu、Cd含量及其毒性具有非凡的功能,并能使红壤中可溶态、交换态Cu、Cd明显向有机态、铁锰氧化物包被态和硫化物Cu、Cd转化。换言之,CaCO_3能使红壤中有效态金属向迟效态和无效态金属转化,致使其水、酸浸提液中Cu、Cd毒性被消除。
The effect of additives including milk vetch, CaCO_3 and bentonite on the toxicities of copper and cadmium in soil extracts and their forms were emphatically discussed in the present paper. The experimental results demonstrated that of the three additives, CaCO_3 showed an extraordinary ability to lower the contents of water-soluble Cu and Cd and extractable Cu and Cd with 0.1 mol/L HCl extractant as well as their toxicities in red soil, and it could make the Cu and Cd in red soil transform obviously from water-soluble and exchangeable forms into organic, Fe- and Mn-oxides occluded and sulphide forms. In other words, CaCO_3 could change the available forms of metals into slowly ava liable and unavailable forms, resulting in the elimination of the toxicities of Cu and Cd in water and acid extraction solutions.
出处
《土壤学报》
CAS
CSCD
北大核心
1992年第4期377-382,共6页
Acta Pedologica Sinica
关键词
添加物
生物毒性
土壤
铜
镉
Additives, Biotoxicity, Heavy metal, Metal forms
