基于地球化学基线的土壤重金属污染潜在生态风险评价

地球化学基线是区分地球化学背景和异常的重要参数。在采集和测试德兴地区约5000km^2面积的479个表层土壤样品基础上，采用标准化方法确定了样品中Cu，Pb，Zn，Cd，Cr，As和Hg等7种重金属元素的基线值，并以基线作为潜在生态风险评价的参比值，对德兴地区土壤重金属污染进行潜在生态风险评价。结果表明：研究区可划分为3个潜在生态风险等级：轻微生态风险、中等生态风险和强生态风险，强生态风险区主要分布在德兴铜矿和钟家山煤矿等矿业活动区附近。其他大部分地区为轻微生态风险区。

POTENTIAL ECOLOGICAL RISK ASSESSMENT ON HEAVY METAL IN THE SOIL OF DEXING AREA BASED ON GEOCHEMICAL BASELINE

Geochemical baseline is an important parameter to distinguish geochemical background from contamination. So it is very significant to focus research on geochemical baseline of heavy metal elements in the soil of Dexing area. After a total of 479 samples was collected and analyzed,by using of normalization approach,the baselines of seven heavy metal elements in topsoil such as Cu, Pb, Zn,Cd,Cr, As and Hg were calculated. Taking the baseline as the contrast parameters,a potential ecological risk assessment of soil environment quality was acquired. The results indicate that Dexing area can be divided into three grades .little ecological risk region which was a small area located in and around Dexing copper mine ; middle ecological risk region which located far nearby the mining area;and high ecological risk region which located in most areas except above mentioned area.