粤北某矿下游农用地花生种植的重金属风险

对粤北矿尾矿库附近及下游酸性废水影响下的农用地种植的花生及其根部土壤和灌溉河水样品中4种重金属Cr、Cu、Pb、Zn进行分析研究,通过单因子污染评价法、生物富集系数法和THQ健康风险评价法,探讨4种重金属对灌溉河水、农用地土壤、种植花生的污染情况及健康风险程度。结果显示,研究区河水及根土中重金属污染程度以Cr最低,其次是Pb,最高为Cu、Zn,但种植花生的健康风险Cr却最高,Cu、Zn其次,Pb则最低。花生仁对Pb的富集不明显,但也具有一定的潜在健康风险。总体来说,该地区种植花生的重金属风险Cr、Cu、Zn偏高、Pb不明显,该结果可为该区域农用地的安全利用提供理论依据。

Risk of Heavy Metal of Peanut Planting in Agricultural Land of Downstream of Sulfide Mine, North Guangdong

The heavy metal concentration of Cr, Cu, Pb, Zn of peanuts, roots soil of agricultural land and irrigation river water samples were analyzed from near and downstream of Northern Guangdong Mine tailing pond, the degree of pollution and the health risk of four heavy metals were evaluated by the single factor pollution index, bio-concentration factor and target hazard quotients health risk. The results showed that the low pollution level and high potential health risk of the Cr element, high pollution level and potential health risk of the Cu and Zn elements relatively, slight-middle pollution level and low potential health risk of the Pb element, lower than the Cu and Zn elements, and not obvious of the Pb enrichment of peanuts. In general, high health risks of heavy metals Cr, Cu, Zn and low health risks of Pb element of peanut planting in research area, and the results provided a theoretical basis for the security use and soil improvement of the regional agricultural land.