土壤重金属Pb和Cd在小白菜中的富集特征及产地环境安全临界值

通过盆栽盆栽试验，研究了江苏两种不同类型土壤，即水稻土和潮土中小白菜可食部分对Pb和Cd的富集特征，并探讨了Pb与Cd在产地土壤环境中的安全临界值。结果表明，总体上小白菜可食部分对Pb和Cd的富集，在两种土壤类型下均随处理浓度的增加呈现递增趋势。和对照相比，两种土壤中小白菜可食部分Pb的最高含量分别提高了18.31和9.49倍，Cd的最高含量分别提高了15.4和10.04倍。同一处理水平下，水稻土中的Pb和Cd比潮土中的更易被植物富集。水稻土中小白菜可食部分Pb含量是潮土中的2.54倍，Cd含量则是潮土中的1.92倍。依据国家食品污染物限量标准（GB 2762-2005），进行方程拟合，得出的种植小白菜的水稻土Pb和Cd的安全临界值分别为36.54 mg?kg-1和0.30 mg?kg-1，低于或等于国家土壤环境安全标准限制的临界值（HJ332-2006）。潮土Pb和Cd的安全临界值分别为 110.21 mg?kg-1 和1.09 mg?kg-1，均高于国家土壤环境安全标准限制的临界值（HJ332-2006）。

Soil Pb and Cd Accumulation Characteristics of Pakchoi (Brassica chinensis L.) and Their Environmental Critical Values in Pakchoi Production Area for Food Security

It is very important to explore the enrichment characteristics of soil heavy mental by vegetable and the relationship between heavy metal content in vegetable and in soil.The experiment was conducted to study the dose-response relationship of soil lead (Pb) and cadmium (Cd) concentration with their uptakes by Pakchoi (Brassica chinensis L.),as well as their environmental critical values in Pakchoi production area for food security.The results showed that:generally,the contents of Pb and Cd in the edible par...