江西德兴矿集区水系沉积物重金属污染分析

对矿山及其周边地区的环境进行现状调查和评价，可以为环境监测和环境保护提供客观依据，具有重要意义。以江西德兴铜多金属矿山及矿集区为研究区，开展区域水系沉积物的重金属污染研究。在德兴地区4 800 km2的范围内，系统采集水系沉积物样品330个。同时，采用X荧光光谱法、等离子原子发射光谱法等现代测试技术，分析了土壤和水系沉积物中重金属（As、Hg、Cd、Cr、Zn、Cu、Pb）的含量。样品中重金属As、Hg、Cd、Cr、Zn、Cu和Pb的含量变化范围分别为3070~1 109、0015~5430、 0035~135、7~236、22~1 770、5~4 390和15~1 685 mg/kg。通过对样品的重金属元素含量统计分析和绘制等值线图，发现该区域水系沉积物中存在不同程度的As、Hg、Cd、Zn、Cu和Pb重金属污染。污染区域主要分布在德兴铅锌和铜钼矿区德兴河下游至与乐安河交汇处、德兴河与大坞河周边地区、西北部分煤矿区.

HEAVY METAL CONTAMINATION IN SEDIMENTS OF DEXING MINES,JIANGXI, CHINA

It is very important to investigate and assess ecological environment quality of mines and neighborhood areas for ecological environment monitoring and protection.In order to assess the extent of heavy metal contamination resulting from past mining activity in Dexing region，330 sediment samples within scope of 4 800 km2 were collected and analyzed for As，Hg，Cd，Cr，Zn，Cu and Pb in 2004.Heavy metal levels were determined using inductively couple plasma atomic emission spectrometry and X ray fluorenscence spectrometry procedures.The contents of sediments samples concentrated between 3070~1 109 mg/kg for As，0015~5430 mg/kg for Hg，0035~135 mg/kg for Cd，7~236 mg/kg for Cr，22~1 770 mg/kg for Zn，5~4 390 mg/kg for Cu，and 15~1 685 mg/kg for Pb，respectively.Based on the statistics analysis and contour mapping of heavy metal contents，the results of assessment indicated consistently that the extents of contamination and potential ecological risk were different for As，Hg，Cd，Cu and Pb，especially in the areas of Dexing River and Dawu River around Dexing mines，along the lower courses of Le′an River，and some coal mines in the northwest.