摘要
为了了解渭河陕西段河道沉积物重金属空间分布特征,本研究对渭河陕西段干流及其支流17个采样点沉积物中的10种重金属元素(Cd、Sb、As、Co、Cu、Pb、Ni、Cr、Zn、Mn)含量进行测定及来源辨析。结果表明:重金属元素Cd、Sb、As、Co、Cu、Pb、Ni、Cr、Zn、Mn的平均含量分别为0.10、1.24、11.73、11.95、24.90、24.91、29.31、54.18、72.74、626.85 mg·kg-1,除Cd的变异系数大于1以外,其他元素的变异系数均低于0.5。其中,Cd、Pb、Cr含量于灞河入渭处达到峰值,Co和Mn在黑河入渭处达到峰值,Cu和Zn在清姜河入渭处达到峰值,Sb、As和Ni分别于沙王渡、咸阳铁桥和林家村处达到峰值。相关性分析、主成分分析和聚类分析表明,Cd、Co、Cu、Pb、Ni、Cr、Zn、Mn主要来源于以工业源和生活源为主的污染源;Sb、As主要来源于农业和地球化学污染源。
In order to understand the spatial variation of heavy metals in Shaanxi section of Weihe River,the contents and sources of Cd,Co,Cu,Pb,Sb,As,Ni,Cr,Zn,Mn in sediments at 17 sampling sites in Shaanxi section of Weihe River and its tributaries were analyzed.The results showed that the average contents of Cd,Co,Cu,Pb,Sb,As,Ni,Cr,Zn,Mn were 0.10,1.24,11.73,11.95,24.90,24.91,29.31,54.18,72.74,626.85 mg·kg-1,respectively.Except for that of Cd being greater than 1,the coefficient of variation for each of other heavy metals was less than 0.5.The peak contents of Cd,Pb and Cr were found at the sampling site of Bahe River,of Co and Mn at Heihe River,of Cu and Zn at Qingjiang River,and of Sb,As and Ni at Shawang Ferry,Xianyang Railway Bridge and Linjia Village,respectively.According to the results of correlation analysis,principal component analysis and cluster analysis,the elements of Cd,Co,Cu,Pb,Ni,Cr,Zn and Mn mainly originated from industrial and domestic sources,but Sb and As mainly originated from agricultural and geochemical sources.
作者
李玄添
张风宝
杨明义
LI Xuan-tian;ZHANG Feng-bao;YANG Ming-yi(State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Institute of Soil and Water Conservation,Northwest A&F University,Yangling 712100,Shaanxi,China;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yang-ling 712100,Shaanxi,China)
出处
《应用生态学报》
CAS
CSCD
北大核心
2020年第12期4225-4234,共10页
Chinese Journal of Applied Ecology
基金
陕西省水利科技计划项目(2013slkj-11)资助。
关键词
渭河
表层沉积物
重金属元素
污染来源
Weihe River
surface sediment
heavy metal
pollution source
