江西抚州烟区土壤及烟叶重金属污染状况评价

为了弄清江西抚州烟区土壤和烟叶中As、Cd、Cr、Cu、Ni、Pb、Zn和Hg等重金属含量和污染状况，运用内梅罗指数和相关分析法，对这些重金属元素在土壤和烟叶中的含量进行了测定。结果表明，该烟区土壤中重金属含量总体上低于我国土壤二级标准（GB15618-1995），但其污染程度已处于警戒线水平，Cd和Hg为烟区土壤主要风险因子。土壤和烟叶中重金属含量顺序分别为 Zn＞Pb＞Cr＞Cu＞Ni＞As＞Cd＞Hg 和 Zn＞Cu＞Pb＞Cd＞Cr＞Ni＞As＞Hg，土壤中 Hg、Cd、As和烟叶中Ni、Cr变异系数均较大。烟叶中重金属富集系数顺序为Cd＞Zn＞Cu＞Hg＞Ni＞Cr＞Pb＞As，烟叶Cd富集系数高达11.67，表明烟草属于Cd强烈富集作物。

Assessment on Heavy Metals in Soil and Tobacco Leaves in Fuzhou of Jiangxi Province

The contents of As, Cd, Cr, Cu, Ni, Pb, Zn and Hg in soils and tobacco in Fuzhou of Jiangxi province were determined. The Nemero pollution index were used to evaluate the soil pollution. The result showed that heavy metal contents in Fuzhou soil were lower than those of the second grade of standards for soil environmental quality of China （GB15618-1995）, and soil pollution level belonged to precaution range. Cd and Hg were major risk factors in soil. Heavy metals contents of soils and tobacco in Fuzhou were Zn〉Pb〉Cr〉Cu〉Ni〉As〉Cd〉Hg and Zn〉Cu〉Pb〉Cd〉Cr〉Ni〉As〉Hg. The coefficient of variation of Hg, Cd, As in soils and Ni, Cr in tobacco were relatively high. Enrichment factors of heavy metals in tobacco were Cd〉Zn〉Cu〉Hg〉Ni〉Cr〉Pb〉As. The enrichment factor of Cd was as high as 11.67, which suggests tobacco is one of the high Cd enrichment crops.