摘要
研究评价密云水库上游铁矿区及周边土壤中重金属分布状况、来源和污染程度。研究结果表明,除Pb和As外,其余重金属均超出北京市土壤背景值,其中Hg污染最严重,超出北京市土壤背景值14倍。相关性分析显示,Be、Pb和As之间互相成极显著正相关(p<0.01),与Cd和Hg成显著负相关。PCA和CA结果表明,Ba、V属于混合源,受自然源中天然岩石的风化和人为源中农业活动、生活用品、化石燃料燃烧等影响;Be、Pb和As属于自然源,主要受母质岩风化侵蚀控制;Cd和Hg属于人为源,主要受矿山开采、选冶以及酸性废水等影响。富集因子法和地累积指数评价表明Cd属于中度富集和中污染,Hg属于显著富集和重污染,这主要与矿山活动有直接关系,且污染已达到一定程度,需要引起高度重视。该研究结论将为北京市矿山环境污染防治和密云水库的保护提供科学依据,并为矿山土壤中重金属的进一步研究提供一定的参考价值。
The distribution, sources and contamination levels of heavy metals in soil around iron ore area in the upper reaches of Miyun Reservoir were researched in the article. The results indicated that the metal concentrations in the soil samples ex-ceeds that of the background levels in Beijing, with Pb, As as exceptions. The pollution produced by Hg is the most serious,whose concentration is 14 times higher than the soil background values in Beijing. Correlation analysis showed that it is sig-nificant positive correlations(p<0.01) between Be, Pb and As, it is significant negative correlations between Cd, Hg and the three before. The PCA and CA showed that Ba, V belong to the mixed source, mainly impacted by both rock weathering and agricultural activities, articles for daily use, the burning of fossil fuel etc. Be, Pb and As belong to the natural source, mainly affected by weathering and erosion of parent material rock. Hg belongs to anthropogenic source, mainly impacted by mining,beneficiation, smelting and acid mine drainage waste, etc. The Enrichment Factor and Geo-accumulation Index suggested that Cd belongs to moderate concentration and contamination, Hg belongs to significant enrichment and serious contamination,which is directly related to mining activities. The pollution has reached a certain level,which requires high attention. The conclusion will provide scientific basis for the mine environmental pollution prevention and protection of Miyun Reservoir in Beijing, and provide certain reference value for further study of heavy metals in soil around mines.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2013年第S2期353-361,367,共10页
Environmental Science & Technology
基金
国家自然科学基金(41173113)
中国科学院百人计划项目
关键词
重金属
聚类和主成分分析
富集因子
空间分布
地累积指数
heavy metal
cluster analysis and principal component analysis
enrichment factor
spatial distribution
geoaccumulation index
