【摘要】 [目的]研究矿区土壤铜、铅和锌的形态分布及生物活性。[方法]选取广东某金属硫化物矿区外围2个代表性的农田深层土壤样品,运用Tessier连续提取法分析其铜、铅和锌的总量和5种化学形态。[结果]结果表明,土壤中铜、铅和锌主要以残渣态形式存在,铁锰氧化物结合态和有机物结合态次之,碳酸盐结合态很少,可交换态最低。不同元素在不同土壤类型和不同土壤层位的形态分布有很大差别。以生物活性系数来评价重金属的危害性,这3种元素的生物活性均偏低,其中铅>锌>铜,生物可利用性不高,对生态环境的潜在危害性不大。[结论]该研究结果对土壤铜、铅和锌的环境生物效应及其迁移转化规律具有重要意义。更多还原

【Abstract】 [Objective] The purpose of this research was to study the fractionation distribution and bioactivity of metal elements in cropland soils around mount Lotus mine.[Method]Total contents and five chemical fractions of copper,lead and zinc in two representational cropland deep soils collected from Mount Lotus mine area in eastern Guangdong were analyzed using Tessier sequential extraction procedure.[Result]The results showed that Cu,Pb and Zn were present mainly in the residual fraction,the Fe-Mn oxides-bounds and organic-bounds were in the second place,carbonate-bound fractions were very small,the proportions of exchangeable were the lowest.There were significant differences in fractionation distributions of heavy metals in different soils with different layers.Bioactivity coefficient could be used to evaluate risk assessment of heavy metals.The bioacctivity of Cu,Pb and Zn in soils were low with a sequence of Pb >Zn >Cu,so it was hardly useful for biology,which did not do serious harm to entironment.[Conclusion] This research has important meanings for entironment bioactivity effect and migration transformation law of heavy metals.更多还原