摘要
利用因子分析和元素含量特征分析两种方法,对天津市潮间带的4个无扰动沉积物柱样的46个样品进行了重金属分析,并探讨了重金属的来源方式和富集原因。研究结果表明,天津市潮间带的重金属可分为3类:1)Fe、Cr、Al及Mn元素主要受环境背景值的影响,2)Hg和Cd受人为活动的影响较大,3)As、Zn、Pb、Cu及Ni受环境背景值及人类活动的双重影响,且影响大小随所在位置的不同而变化。结合210Pb和137Cs测年结果,定量确定了天津市潮间带小于0.063 mm粒级沉积物中Ni等11种重金属元素的环境背景值,并以此为基础,进一步探讨了重金属富集年代、富集量及污染历史和人类活动的关系,发现多数重金属的污染始于1910年代,并在1954年之后富集量增加。
Heavy metal contents of 46 samples,taken from 4 undisturbed cores,were analyzed in Tianjin intertidal zone.Sources and enrichment reasons of the heavy metals were studied by using factor analysis and elemental content feature analysis.The results show that the heavy metals can be divided into three categories：（1） Fe,Cr,Al and Mn are mainly controlled by the environmental background values,（2） Hg and Cd are greatly influenced by human activities,and（3） As,Zn,Pb,Cu,Ni are affected by both the environmental background values and human activities as well,and the influence of the two factors are not the same in different locations of Tianjin intertidal zone.Considering the 210Pb and 137Cs dating information,the environmental background values of the 11 heavy metal elements in the sediments of less than 0.063 mm were quantitatively determined,respectively.Furthermore,by comparison with such values,the relationship between the enrichment period,abundance,pollution history of the heavy metals and human activities was discussed.Consequently,the heavy metal pollution mainly began from the 1910＇s and then increased in 1954.
出处
《地质调查与研究》
2010年第1期55-62,共8页
Geological Survey and Research
基金
中国地质调查局项目:环渤海湾重点地段环境地质调查及脆弱性评价(1212010540501)
国家海洋局908专项(TJ908-02)
关键词
天津市
重金属
来源判别
环境背景值
污染历史
Tianjin
heavy metal
source discrimination
environmental background values
pollution history
