大连湾表层沉积物中汞的赋存形态与生物可利用性研究

发布时间：2018-01-09 14:23

本文关键词：大连湾表层沉积物中汞的赋存形态与生物可利用性研究　出处：《大连海洋大学学报》2017年05期 　论文类型：期刊论文

【摘要】：为了解大连湾沉积物中汞的赋存形态和生物可利用性,对大连湾表层沉积物中总汞(THg)和甲基汞(Me Hg)的含量进行了分析,并采用选择连续提取法对表层沉积物中汞的赋存形态进行了研究,探讨了沉积物中汞的赋存形态与甲基汞的关系。结果表明:大连湾表层沉积物中总汞和甲基汞的平均含量分别为95.1、0.71 ng/g,甲基汞占总汞的比例(甲基化率)为0.76%,与自然背景值相比,沉积物中总汞含量明显受到了人类活动的影响;大连湾表层沉积物中各赋存形态汞比例的平均值由小至大依次为水溶态汞(Hg-w)(3%)胃酸溶解态汞(Hg-h)(10%)硫化物结合态汞(Hg-s)(24%)有机结合态汞(Hg-o)(31%)强络合态汞(Hg-e)(32%),Hg-e、Hg-o和Hg-s为主要存在形态;沉积物中Hg-w、Hg-h和Hg-o与甲基化率呈正相关,显示Hg-w、Hg-h和Hg-o具有较高的生物可利用性。研究表明,采用选择连续提取法进行沉积物中汞赋存形态的研究,对了解沉积物中汞的生物可利用性具有较好的指示意义。
[Abstract]:In order to understand the speciation of mercury in sediments and organisms in Dalian Bay, the availability of total mercury in the surface sediments of Dalian Bay (THg) and methylmercury (Me Hg) were analyzed, and the choice of speciation of mercury in surface sediments was studied in continuous extraction method, discusses the relationship between speciation and methylmercury mercury in sediments. The results showed that the average content of total mercury and methylmercury in the surface sediments of Dalian bay were 95.1,0.71 ng/g, the percent of the total mercury (mercury methylation rate) was 0.76%, compared with the natural background value, the total mercury content in sediments was significantly affected by human activities; the average value of the species the proportion of mercury in the surface sediments of Dalian Bay in order from small to large water soluble mercury (Hg-w) (3%) acid dissolved mercury (Hg-h) (10%) sulfide bound mercury (Hg-s) (24%) organic combination Hg (Hg-o) (31%) strong complex Hg (Hg- E) (32%), Hg-e, Hg-o and Hg-s as the main forms in the sediments; Hg-w, Hg-h and Hg-o and the methylation rate was positively related to Hg-w, Hg-h and Hg-o have high bioavailability. The results show that the choice of mercury speciation in the sediments of the continuous extraction method, to understand the sediment mercury in biological has a good indication of use.

【作者单位】：大连海洋大学水产与生命学院;国家海洋环境监测中心国家海洋局近岸海域生态环境重点实验室;辽宁省海洋水产科学研究院;
【基金】：国家自然科学基金资助项目(21577028) 国家海洋公益性行业科研专项(201105015-7) 辽宁省教育厅科研项目(L201603) 辽宁省省级本科教学改革项目(UPRP20160326) 福建省新型污染物生态毒理效应与控制重点实验室开放课题(PY16005)
【分类号】：X55
【正文快照】： 汞是自然环境中广泛存在的一种神经毒性元素,沉积物作为水环境的重要成分,是汞富集的重要场所,也是环境中甲基汞生成的重要场所[1-4]。沉积物中的甲基汞通常是在厌氧环境下由微生物的甲基化过程产生,其含量和分布与沉积物中生物可利用性汞的含量密切相关[5]。汞的赋存形态和环

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