摘要
利用ICP技术测定了湘江长沙段沉积物中14种金属元素含量,通过聚类分析法确定了重金属的三个主要来源:自然来源(Cu,Ni和Pb),中上游冶炼工业污染(Cd,Zn)和长沙市原工业区污染(Cr)。运用地累积指数法及潜在生态风险指数法,评价了重金属污染状况。结果表明:(1)湘江长沙段沉积物中重金属Cd、Zn污染较为严重,其含量范围分别为2.7～20.9 mg/kg、209.3～662.4 mg/kg;(2)研究区域中RI均值为604.5,表明沉积物中重金属属于很强生态危害,且主要风险污染物为Cd。
14 sediments specimens were sampled systematically from Xiangjiang solved using HC1 -HNO3 -HF- HC104. The following elements were determined by River （Changsha section） and dis- ICP-AES： Al, Cd, Co, Cr, Cu, Fe, Li, Mg, Mn, Ni, Pb, St, V and Zn. Cluster analysis suggested that the heavy metals can be classified into three groups of natural sources （ Cu, Ni and Pb）, non - ferrous metal smelting sources in the upper reaches, and Changsha in-ternal industrial sources（Cr）. The potential ecological risk index and the index of geoaccumulation were used to evaluate the contamination level of heavy metals in the sediments. The results indicated that Xiangjiang River （ Changsha section） was heavily polluted by Cd and Zn with concentrations ranging from 2. 7 N 20. 9 mg/kg and 209. 3 - 662.4 mg/kg, re-spectively, RI values in this area varied from 178 to 1285 and the mean value reached 603 implying very high ecological risks in most of the sampling sites of the studied area, which were mainly from Cd, and the pollution characteristic of multi-metals in this section was mainly related to Cd.
出处
《广州化工》
CAS
2012年第23期120-123,共4页
GuangZhou Chemical Industry
关键词
重金属污染
湘江
评价
heavy metal pollution
Xiangjiang River
evaluation
