渤海湾潮间带(大沽口)柱状沉积物中的重金属来源判别

Sources Identification of Heavy Metals in Core Sediments of Bohai Bay

采用因子分析法对2003年11月采自渤海湾潮间带(大沽口)柱状沉积物中的重金属含量数据进行了分析,提取出的三个主要因子占据重金属含量样本信息量的83.69%,以此定量判别出重金属的来源方式和富集原因。并有效采用Li和Sc作为污染重金属的参照元素,以这两种元素含量比值的自然对数和目标元素与Sc的比值的自然对数做比率散点图的方法验证了因子分析所得的结论。结果表明,Cd,Zn和As以人类活动输入为主,Pb,Cr,Hg受到一定人为输入影响,但仍以环境背景贡献为主,Cu,Al,Fe,Ni以自然来源为主。

Factor analysis is employed to analyse the data of heavy metals in Bohai Bay sediments. The three abstracted factors occupy 83.69 % of the total information, which helps to quantitatively master the sources of heavy metal. Based on correlation analysis results and element chemical properties, Li and Sc are selected as the concentration normalizing elements, and the factor analysis is tested by scattered plots of natural logarithm of element/Sc versus natural logarithm of Li/Sc. Results show that Cd, Zn and As are seriously contaminated by human pollution. Pb, Cr, Hg are partly contaminated by humans, while Cu, Al, Fe and Ni are from natural sources.