摘要
为掌握5河尾闾沉积物表层重金属的污染特征,选取6个典型代表性区域沉积物表层样品,并对6种重金属进行了测定分析。结果表明,沉积物中6种重金属Cu、As、Pb、Cr、Cd和Zn的质量分数范围分别为24.62~72.19 mg/kg、5.65~17.57 mg/kg、19.93~42.92 mg/kg、36.41~53.11 mg/kg、0.56~2.14 mg/kg、7.06~15.43 mg/kg;库区沉积物表层重金属存在一定程度污染,除Zn外,其余金属元素均已超过鄱阳湖背景值。地累积指数法和污染指数法分析表明,Cu与Cd是主要污染因子,各元素污染程度排序：Cu〉Pb〉Cd〉Cr〉As〉Zn,各重金属元素呈正相关,具有相似迁移过程的规律与污染来源。Hakanson潜在生态风险指数法评价与污染程度评价结果基本一致,Cd达到较重风险水平,其余元素在各断面都处于中度风险水平。
To master the five fiver pollution characteristics of heavy metals in the surface sediments Tail, selected six typical regional representative sample surface sediments, and six kinds of heavy metals were determined and analyzed. The results showed that six kinds of heavy metals in sediment Cu,As,Pb,Cr,Cd and Zn content ranges of 24.62 -72.19 mg/kg,5.65 - 17.57 mg/kg, 19.93- 42.92 mg/kg,36.41 -53.11 mg/kg,0.56 -2.14 mg/kg,7.06 - 15.43 mg/kg; Reservoir sedi- ments of heavy metals in the surface there is a certain degree of pollution,in addition to Zn, the other metal elements have already exceeded the background values of Poyang Lake. Accumulates index and pollution index showed that Cu and Cd is the main pollution factors, each element contamination sort ： Cu 〉 Pb 〉 Cd 〉 Cr 〉 As 〉 Zn, each heavy metal elements were positively correlated with similar migration laws and pollution source. Hakanson potential ecological risk index assessment and evalua- tion results are basically the same degree of contamination, Cd heavier reached the level of risk, the remaining elements in each section are at a moderate risk level.
出处
《江西科学》
2016年第4期419-424,共6页
Jiangxi Science
基金
国家自然基金项目"鄱阳湖湿地基质特征及沉水植被适生机理研究"(51369024)
关键词
沉积物
重金属
风险评价
sediment
heavy metals
risk assessment
