汾河沉积物中重金属污染及生态风险评价

Pollution and Ecological Risk Assessment of Heavy Metals in Sediment of Fenhe River

研究针对汾河太原段的沉积物进行采样,对重金属进行分析。测定结果表明:汾河太原段沉积物中重金属的含量很高,4种重金属之间、12个采样点之间含量差别较大;含量反映了工业排放是造成汾河太原段重金属含量高的主要原因。重金属污染状况评价表明:所研究的4种重金属都处于中等以上污染水平,污染程度排行为:Pb>Cr>Cu>Ni;对采样点进行综合污染状况评价表明,所有采样点均处于一个较高或很高的污染水平,污染最严重的是胜利桥和涧河。潜在生态风险评价表明:Cu处于较高的潜在生态风险,Pb、Cr和Ni处于中、低的潜在风险;采样点的潜在风险评价表明:胜利桥、涧河和南沙河的综合潜在生态风险处于较高水平。

The samples of sediments in Taiyuan segment of Fenhe River were collected,and the content of heavy metal elements of the samples were analyzed.The measured results showed that the contents of Heavy Metals in Sediment were high.The difference of contents was comparatively large among four heavy metal elements and twelve sampling sites.The emission of polluted industry water was main reason of pollution.The assessment of heavy metals pollution showed that the pollution of four elements was all in medium pollution level.The ranking of heavy metal element pollution level was Pb Cr Cu Ni.The assessment of composite pollution for all twelve sampling sites showed that the all the sampling sites were in comparatively high or very comparatively pollution level.The most serious sampling site was Shengli Bridge and Jian-he.The assessment of heavy metals potential ecological risk showed that the element of Cu was in comparatively high potential ecological risk level,and the elements of Pb,Cr and Ni were in medium or lowpotential ecological risk level.The assessment of composite potential ecological risk for all twelve sampling sites showed that the composite potential ecological risks of Shengli-Bridge,Jian-he and Nansha-River were in high level.