Study on the distribution law,environmental assessment and source traceability of heavy metals in the surface sediments of Biliu River intertidal zone in Liaodong Peninsula

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摘要:

为研究碧流河口潮间带的沉积物重金属分布特征、物质来源及生态环境,采用地累积指数法、潜在生态风险指数法对研究区沉积物重金属污染程度进行评价,采用Pearson相关性分析、富集因子评价法结合沉积物粒度特征对沉积物重金属污染来源进行分析.结果表明,潮间带表层沉积物中Cu,Pb,Zn,Ni和Cr质量含量范围分别为28.80~72.40,24.65~76.88,26.40~135.20,41.08~145.36,97.24~210.80 mg·kg-1,平均值分别为42.68,56.21,93.30,99.30,141.46 mg·kg-1,其中Cu,Cr平均质量含量达到海洋沉积物标准(GB 8668-2002)Ⅱ类,Pb,Zn平均质量含量达到海洋沉积物标准Ⅰ类.污染评价结果表明,5类重金属元素污染程度从大到小依次为Ni,Pb,Cu,Cr,Zn,且Cu,Zn,Ni,Cr由陆向海整体呈递减趋势,而Pb由陆向海整体呈递增趋势.地累积指数法、潜在生态风险指数法结果显示,碧流河口潮间带生态环境较好,主要为轻微污染.重金属来源分析显示,研究区Cu,Zn,Cr为自然来源,Ni,Pb为人为来源.碧流河口重金属除地表径流、沉积物粒径等自然因素控制外,区域内工农业活动、沿海养殖业规模及与燃煤交通等有关的大气沉降等亦对区域内重金属的分布有重要影响.

In order to study the distribution characteristics,material sources,and ecological environment evaluation of sediment heavy metals in Biliu River intertidal zone,the ground accumulation index method and potential ecological risk index method were used to evaluate the degree of sediment heavy metal pollution in the study area.The Pearson correlation analysis and enrichment factor evaluation method combined with sediment particle size characteristics were used to analyze sediment heavy metal pollution sources.The results showed that the mass fractions of Cu,Pb,Zn,Ni,and Cr in the intertidal surface sediments ranged from 28.80 to 72.40,24.65 to 76.88,26.40 to 135.20,41.08 to 145.36,97.24 to 210.80 mg·kg-1,respectively,with mean values of 42.68,56.21,93.30,99.30,141.46 mg·kg-1.The average content of Cu and Cr reached the marine sediment standard(GB 8668-2002)category II,and the average content of Pb and Zn reached the marine sediment standard category I.The pollution evaluation results showed that the pollution degree of five types of heavy metals was in descending order of Ni,Pb,Cu,Cr,Zn.Cu,Zn,Ni and Cr showed an overall decreasing trend from land to sea,while Pb showed an increasing trend from land to sea.The geo-accumulation index method and the potential ecological risk index method showed that the ecological environment of the intertidal zone in the Biliu estuary was relatively good with slight pollution.The analysis of heavy metal sources showed that Cu,Zn and Cr were natural sources,Ni and Pb were anthropogenic sources in the study area.Heavy metals in the Biliu estuary were controlled by natural factors,such as surface runoff and sediment particle size.Industrial and agricultural activities in the region,the scale of coastal aquaculture,and the atmospheric deposition related to coal-burning transportation also have an important impact on the distribution of heavy metals in this region.

作者:

李宁张威苏世兵

Li Ning;Zhang Wei;Su Shibing(School of Geography,Liaoning Normal University,Dalian 116029,China)

机构地区:

辽宁师范大学地理科学学院

出处:
《betway官方app 学报：自然科学版》 CAS 北大核心 2022年第6期60-70,共11页

Journal of Henan Normal University(Natural Science Edition)

基金:
辽宁省特聘教授课题项目(60618006)。

关键词:
沉积物重金属污染评价碧流河

sediment heavy metals pollution evaluation Biliu River

分类号:

X55 [环境科学与工程—环境工程]