摘要(Abstract):
以鲁西北典型入海河流表层沉积物为研究对象,分析表层沉积物中汞(Hg)、镉(Cd)、砷(As)、铬(Cr)、铜(Cu)、锌(Zn)、镍(Ni)和铅(Pb) 8种重金属的含量,识别重金属的污染来源并评估生态风险。结果表明,表层沉积物中Hg、 Cd、 As、 Cr、 Cu、 Zn、 Ni和Pb的质量比均值分别为0.07、 0.16、 9.54、 65.40、 21.70、 78.80、 26.20、 20.40 mg/kg,除Cr、 Cu和Pb以外,其他5种重金属含量均高于山东省土壤元素背景值,其中Hg的富集程度最严重;从空间分布上看,除As的含量呈现流域下游较高以外,其余重金属的含量均呈现流域中游较高;多元统计分析显示,Hg主要来源于原煤和石油产品的燃烧,Cd和Zn主要来源于金属冶炼和交通污染源,As主要来自于农药和工业废水排放,Ni主要来源于自然分解和工业排废,Cr、 Cu和Pb主要来源于自然源;地累积指数评价显示,Hg和Cd整体处于低污染状态;鲁西北典型入海河流表层沉积物中重金属的综合潜在生态风险的平均值为230.24,整体处于中等风险等级。
关键词(KeyWords):沉积物;重金属;空间分布;污染评价;鲁西北
基金项目(Foundation): 山东省重点研发计划项目(公益性科技攻关类,2019GFS110016);; 山东省重大水利科研与技术推广项目(SDSLKY201908-01)
作者(Author): 熊鑫玉,杨丽原,刘友春,曹利军
DOI: 10.13349/j.cnki.jdxbn.20211124.001
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