河北清苑县及周边农田土壤及农作物中重金属污染状况与分析评价

在河北省地质调查院1：250000多目标区域地球化学调查的研究基础上,对河北省清苑县及周边的农田土壤及玉米子实进行了采样分析,分析该地区农田土壤重金属的富集程度,并采用富集因子法和单因子土壤污染指数法进行污染状况评价。结果表明,该研究区土壤以重金属Zn、Cu、Cr、Pb、Cd污染最为严重,其中Cd污染已达显著富集程度;通过对子实重金属含量的描述统计显示,其农产品也受到一定程度的重金属污染,其中玉米子实中的重金属Ni和Pb存在超标现象。通过地统计学方法分析揭示了清苑县土壤重金属中污染严重的Zn、Cu、Cr、Pb的空间分布特征,并探索其主要成因。

The Investigation and Evaluation of the Heavy Metal Pollution in Farmland Soil and Crop in the Qingyuan of Hebei, China

Based on the 1∶250 000 target regional geochemical survey of Hebei geological survey bureau, study the soil and corn seeds sampling, analyse the area of soil heavy metal concentration degree emphatically, and use enrichment factor and single factor soil pollution index methods for contamination assessment. Results showed that the soil of the study area was polluted by Cu, Zn, Cr, Pb and Cd seriously, includ- ing Cd had achieved significant enrichment degree;it indicated that the crop had been polluted though the statistical of the heavy metal in the corn seeds, such as the content of Ni and Pb in corn seeds exceed the food hygiene standards. Through the geo-statistical methods to analyse and reveal the spatial distribution characteristics of the heavy metal of Zn, Cu, Pb and Cr which had serious pollution, and explore the main reasons of heavy metal pollution.