湖南某冶炼区果园土壤Cd、Pb、Zn分布及生物可利用性评价

对湖南某废弃铅锌冶炼厂周边土壤的现场调查和取样分析,发现研究区土壤pH值范围为4.5~6.5。土壤中Cd、Pb、Zn平均含量分别为5.66 mg/kg、2 409.00 mg/kg、1 224.42 mg/kg,污染显著,且变异强度较大。风险评估编码方法(RAC)显示研究区土壤中Zn处于低风险及以下;Pb含量不均匀,污染最重者达到极高风险;Cd绝大部分处于中风险及以上。桔子样品中重金属含量的检测结果表明,Cd未超过《食品中污染物限量》标准;Pb富集程度最高,其含量最低的样品Pb含量为标准的4倍以上。

Cd,Pb, Zn Distribution and Bioavailability Evaluation of Orchard Soil in Smelting Area in Hunan Province

Through field investigation and sampling of topsoils surrounding an abandoned lead and zinc smelter in Hunan province, results of analysis of soils in study area revealed that soil pH ranged of 4. 5 to 6.5, and the average concentration of soil Cd, Pb, Zn were 5.66 mg/kg,2 409.00 mg/kg and 1 224.42 mg,/kg respectively, the pollution is significant, and is of great variability. Risk Assessment Coding method （ RAC ） showed that zinc in the study area is low risk and below ; uneven levels of lead, the heaviest polluters achieve very high risk ; the majority of soils cadmium in the area present medium risks and more. Orange sample tests indicated that the content of cadmium in orange did not exceed the＂ Maximum levels of contaminants in foods＂ standard, while the most enriched heavy metal was proven to be Pb, the lowest content sample of which was found over 4 times than the standard.