【摘要】 应用野外调查的方法,研究了辽宁省青城子铅锌矿矿区土壤中Cd、Pb、Cu、Zn的污染状况以及在主要栽培作物玉米的根、茎、叶、轴心和籽实不同器官中的积累规律。调查结果表明,矿区土壤重金属含量的大小为Zn>Pb>Cu>Cd;用重金属污染指数对矿区土壤的污染程度进行评价,其污染指数的大小为Cd>Pb>Zn>Cu,Cd含量已超过土壤环境质量的三级标准,污染程度最重;重金属在玉米体内的含量为Pb>Zn>Cu>Cd,4种重金属元素在玉米不同器官中的积累均为根中含量最高,籽实中最低,玉米籽实中Cd和Pb分别超出食品卫生限量标准的1.5和2倍,而Zn和Cu的含量未超标。更多还原

【Abstract】 Using a field-survey method, we collected and analyzed contents of heavy metals Cd, Pb, Cu and Zn in soil samples around the Qingchengzi Pb-Zn Mining Area of Liaoning Province. The metal accumulations in various parts including roots, stems, leaves, stem cores and seeds of major crop maize (Zea mays L.) were evaluated. The results showed that concentrations of both the selected metals in soils around Qingchengzi and those in plant parts were in good correlations. The concentrations of heavy metals in the soil samples were in an order: Zn>Pb>Cu>Cd, while the pollution indexes of the soil metals in the area were in sequence as Cd>Pb>Zn>Cu. Cd concentrations were over the Soil Environmental Quality Standards Class III, leading serious contamination among the metals tested. Metals in the crop were Cd>Zn>Pb>Cu. Among the various crop parts, the highest concentration was found in roots and the lowest in seeds. The concentrations of Cd and Pb in seed exceeded the Food Safety Standard by 1.5 and 2.0 times, but neither Zn nor Cu was over the standards. This study indicated that bioaccumulation of metals occurs in plants but the extent of accumulation is dependent on the different parts of the plant.更多还原