吉首大学学报(自然科学版)

• 生物与化学 • 上一篇    下一篇

茅洲河流域表层沉积物重金属生态风险评价

龚亚龙,黄聪,黄雷,李红艳,林晓燕,许闯,谭璐明,赵亮   

  1. (深圳市铁汉生态环境股份有限公司,广东 深圳 518040)
  • 出版日期:2016-07-25 发布日期:2016-07-19
  • 作者简介:龚亚龙(1986—),男,安徽合肥人,硕士,深圳市铁汉生态环境股份有限公司工程师,主要从事土壤/水污染环境治理与修复研究.
  • 基金资助:

    深圳市科技研发资金技术开发项目(CXZZ20140418105252027);广东省省级科技计划资助项目(2014B090903015)

Ecological Risk Assessment of Heavy Metals in theSurface Sediments of Maozhou River

GONG Yalong,HUANG Cong,HUANG Lei,LI Hongyan,LIN Xiaoyan,XU Chuang,TAN Luming,ZHAO Liang   

  1. (Shenzhen Techand Ecology & Environment Co.,Ltd,Shenzhen 518040,Guangdong China)
  • Online:2016-07-25 Published:2016-07-19

摘要:

为全面了解茅洲河底泥沉积物中重金属污染特征及其生态风险程度,在茅洲干流和支流中共采集34个底泥样品,测试分析As,Cd,Cr,Cu,Ni,Pb,Zn等7种重金属元素含量,并对其污染来源及生态风险进行讨论.研究结果表明,茅洲河流域表层沉积物中重金属元素Pb,Cd,Cr,Cu,Zn,Ni含量较高,均值均超过中国湖泊底泥中重金属平均含量值,其中Cr,Cu,Zn和Ni超过国家海洋沉积物Ⅲ类标准值.7种重金属元素的地积累指数从大到小依次为Cu,Ni~Zn~Cd~Cr,Pb,As,污染负荷指数从大小到依次为Cu,Ni~Zn,Cd~Cr,Pb,As,潜在生态风险指数从大到小依次为Cd~Cu,Ni,Cr~Zn,As~Pb,这说明沉积物主要受到Cu,Zn,Ni,Cd和Cr的污染.

关键词: 茅洲河, 沉积物, 重金属, 生态风险

Abstract:

In order to understand the pollution characteristics of heavy metals in the surface sediments of mainstream and its tributaries of the Maozhou river in Shenzhen,the concentrations of 7 metals including Pb,Cr,Cd,Cu,Zn,Ni and As in 34 sediment samples were analyzed.Index of geo-accumulation,pollution load index and potential ecological risk index were utilized to access the pollution level and potential ecological risk of heavy metals.The results showed that the sediments of Maozhou river were characterized by elevated levels of Pb,Cd,Cr,Cu,Zn and Ni,which exceeded the average content of heavy metal in the sediments of lakes in China.According to the national Marine sediments standard,most of Cr,Cu,Zn and Ni were higher than the threshold values of class Ⅲ.In addition,index of geo-accumulation followed the order of Cu>Ni~Zn~Cd~Cr>Pb>As,pollution load index was Cu>Ni~Zn>Cd~Cr>Pb>As and the order of potential ecological risk index was Cd~Cu>Ni>Cr~Zn>As~Pb,which indicated that the sediment was polluted by Cu,Zn,Ni,Cd and Cr.

Key words: Maozhou River, sediment, heavy metal, risk assessment

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