利用BCR改进法和Tessier修正法提取不同类型土壤中Cu、Zn、Fe、Mn的对比研究

Assessment of Cu,Zn,Fe,Mn Species in Different Soils by Modified BCR and Tessier Extraction Procedures

连续提取法作为一种重要的化学分析方法,是土壤中重金属元素形态分析的主要环节,但同一种提取法对于不同的土壤类型及同类土壤中不同重金属形态的提取效果差异很大。该文采用改进的连续提取法对山东省常见的褐土、棕壤和潮土3种土壤分别进行实验并对重金属进行测定。分析结果显示土壤中4种重金属含量大小依次为:Fe>Mn>Zn>Cu,重金属元素形态以残渣态为主,水溶态含量较低;不同土壤类型中重金属含量大小依次为:褐土>潮土>棕壤。同时对BCR改进法和Tessier修正法进行了对比和探讨。

As an important chemical analysis method, sequential extraction is the main link in analysis of heavy metals in soils, but adopting single extraction procedure for different types of soil and different forms of heavy metals makes it very difficult to compare the results. In this paper, three common soils Cinnamon, Brown earth and Chao soil in Shandong province were studied by modified sequential extraction, and the extracted metals were determined by atomic absorption spectrometry. Results indicated that the content of four heavy metals in soils was in a sequence of Fe 〉 Mn 〉 Zn 〉 Cu, in which they mainly existed in residual form and less in water soluble form. The total content of four heavy metals in different soils was in a sequence of Cinnamon 〉 Chao soil 〉 Brown earth. Furthermore, the modified BCR and Tessier extraction procedures were discussed and the analytical results were compared.