摘要
对唐山市曹妃甸某农场农用地土壤开展详细调查,采集了研究区内325个表层土壤样品,分析了土壤中8种重金属元素的含量,评估了重金属的结构和空间分布特征,并揭示了重金属的主要来源,为该区域土壤重金属污染防控、治理提供重要信息.该研究区土壤中各元素普遍低于河北省土壤背景值,而Cd元素含量较高,超过土壤背景值和风险筛选值.通过8种重金属元素的地质学统计、元素间相关性分析、PMF模型分析和污染源调查,结果表明Cr、Ni、Cu、Zn和As元素在研究区内呈正态分布,受人类影响较小,主要来自成土母质.Cd元素呈偏态分布,土壤含量表现为北低南高的空间特征,主要由农业活动采用污水灌溉所导致.Pb元素存在部分区域含量较高现象,主要来自于大气沉降,而Hg元素则主要与农业产品投入使用相关.
The present study investigated the concentrations of eight heavy metals in 325 farmland top soil samples taken from a farm at Caofeidian in Hebei province. Results indicated that there was an enrichment of Cd, with concentrations higher than the local background value and above the risk screening value defined by the Chinese Environmental Quality Standard for Soils; while the concentrations of the other metals were lower than the background values. According to geostatistics study, correlation analysis, positive matrix factorization(PMF) modeling and pollution source investigation, it was revealed that Cr, Ni, Cu, Zn and As were normally distributed in the study area and human behavior had very minimal impact on them, mainly originated from soil parent materials. However, Cd showed a skewed distribution, with high concentrations in the south of the studied area, which was mainly caused by sewage irrigation used in agricultural activities. Some Pb hotspots were present, resulted from atmospheric deposition. The major source of Hg was from agricultural inputs such as fertilizers, pesticides and livestock.
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