利用 BCR法和 Maiz法提取蔗田土壤中重金属的研究

摘要

The occurrence characteristics of heavy metals Cu, Zn, Pb, Cd and Ni in the soil samples of sugarcane fields in Guangxi were analyzed by using BCR and Maiz sequential extraction procedures respectively.The results showed that Cu, Zn, Pb, Cd and Ni existed mainly in residual fraction, and they had a lower potential bioavailability.Pb existed mainly in reducible fraction or chelated fraction, and it possessed a certain potential bioavailability.In addition, BCR method acquired higher recovery rate of heavy metal than Maiz method, but the quantity of effective-state Cu, Zn, Pb, Cd and Ni measured by Maiz method was all higher than that of weak-acid-extractable-state Cu, Zn, Pb, Cd and Ni measured by BCR method.%分别采用BCR法和Maiz法两种连续提取法，对蔗田土壤样品中重金属元素Cu、Zn、Pb、Cd和Ni进行了形态分析。结果表明：Cu、Zn、Pb、Cd和Ni均主要以残渣态的形式赋存，具有较低的潜在生物有效性；Pb主要以可还原态或螯合态的形式存在，具有一定的潜在生物有效性；BCR法得到的重金属回收率高于Maiz法的，但是Maiz法测得的有效态Cu、Zn、Pb、Cd和Ni的量均高于BCR法测得的弱酸提取态的量。