四川成都经济区土壤腐殖质重金属元素含量特征研究

通过对四川成都经济区16件土壤样品腐殖质组成及其各组分中重金属元素含量的分析表明,胡敏素是土壤腐殖质的主要组成部分,富里酸和胡敏酸次之。土壤腐殖质中重金属元素含量占土壤全量20%～44%,是土壤重金属污染元素主要存在方式。重金属元素在腐殖质不同组分中的含量具有很大的差异,Cr主要赋存在胡敏素中,Cd、As、Cu、Zn等元素主要赋存在富里酸中。各重金属元素在腐殖酸中含量较高,富里酸中的含量均大于胡敏酸,其机理是富里酸对重金属元素的络合是腐殖酸与重金属相互作用的主要方式。

Content Characteristic of Heavy Metal in Soil Humus of Chengdu Economic Area in Sichuan

Based on analyzing humus composition and content of heavy metal of its of sixteen soil samples collected from Chengdu economic area of Sichuan. The content of heavy metals in soil humus accounts for 20-44% of the total, presenting the dominant existent manner of the contaminated heavy metals. The content of heavy metals had discrepancy in different constituents of humus. Cr was enriched in humin, while Cd, As, Cu and Zn were enriched in fulvic acid. Heavy metals in fulvic acid were more than that in humic acid because of complexation.