基于多元统计分析的辽东湾沉积物痕量金属地球化学特征

发布时间：2018-04-28 18:17

本文选题：痕量金属 + 多元统计分析　；参考：《环境科学研究》2016年05期

【摘要】：为研究辽东湾表层沉积物中痕量金属的地球化学特征和可能产生的生物效应,于2015年在辽东湾设置38个采样点,采集表层沉积物样品,测定其中13种痕量金属污染物的含量,并采用多元统计分析法对其地球化学特征进行研究.结果表明:辽东湾表层沉积物中w(Al)、w(V)、w(Cr)、w(Mn)、w(Fe)、w(Co)、w(Ni)、w(Cu)、w(Zn)、w(As)、w(Cd)、w(Ba)和w(Pb)平均值分别为55 726.95、76.21、35.59、852.85、30 482.16、11.98、27.88、21.60、76.53、9.16、0.17、396.78和21.72 mg/kg;其中w(Al)最高,占63.51%;w(Fe)其次,占34.74%.多元统计分析结果表明,痕量金属受氧化还原环境影响强烈,V、Co、Ni、Cu、Zn、As、Cd在沉积物的氧化还原循环中易被Fe氧化物吸附,与Fe氧化物产生共生关系.Ba与Pb存在共生关系,具有相似的物质来源和地球化学特征;Mn是海洋沉积物中主要化学成分;Cr一般和沉积物中的陆地碎屑相结合.生态效应浓度评价表明,Ni和As偶尔会产生不利的生物效应,产生几率分别为97%和63%;Ni、As、Cu、Pb和Cr长期暴露会产生毒性效应,产生几率分别为100%、94%、74%、6%和3%,Zn和Cd不会产生毒性效应.根据对生物产生负面效应和毒性效应的概率,痕量金属污染程度的排序为NiAsCuPbCrZn=Cd.
[Abstract]:In order to study the geochemical characteristics and possible biological effects of trace metals in surface sediments of Liaodong Bay, 38 sampling sites were set up in 2015 to collect surface sediment samples and to determine the contents of 13 trace metal pollutants. The geochemical characteristics were studied by multivariate statistical analysis. The results showed that the average values of the wangzhuangwangzhuanzhuanwang (wzhuangwanzhuanzao) in the surface sediments of Liaodong Bay were 55.726.955.59852.8530 482.1611.9827.888.6076.53t 9.160.17396.78 and 21.72 mg / kg, respectively, and the highest (63.51wFeN) was the highest (63.51wFeg) (34.74mg / kg), respectively. The results showed that: (1) the average value of the two species in the surface sediments of Liaodong Bay was 55.26. 955%, and the average value of WPb was 76. 535. 985. 827. 880% (76.539.160.17396.78 and 21.72 mg 路kg-1), respectively. The average value of WPb was 55 726. 955. 955. 955. 985. 855. The average value was 76. 539. 9. The results of multivariate statistical analysis show that trace metals are strongly affected by the redox environment. The trace metals are easily adsorbed by Fe oxides in the redox cycle of sediments, and there is a symbiotic relationship between Ba and Pb. Mn is the main chemical component in marine sediments and is combined with terrestrial detritus in sediments with similar material sources and geochemical characteristics. The evaluation of ecological effect concentration showed that Ni and as occasionally produced adverse biological effects, with a probability of 97% and 63% respectively. The long-term exposure to Pb and Cr had toxic effects, and the probability was 100%, 9474%, and 3% Zn and CD would not produce toxic effects, respectively. According to the probability of negative effect and toxic effect on organism, the degree of trace metal contamination is in the order of NiAsCuPbCrZnCd.
【作者单位】：辽宁省海洋水产科学研究院;辽宁省海洋环境监测总站;
【基金】：海洋公益性行业科研专项(201505019) 辽宁省自然科学基金项目(2014020182)
【分类号】：X55

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