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楚科奇海陆架重金属沉积研究

【标题】楚科奇海陆架重金属沉积研究

【Title】History of heavymetals recorded in the sediment of the ChukchiSea, Arctic

【作者】 马豪; 曾实; 陈立奇; 何建华; 尹明端; 曾宪章; 曾文义

【Author】 Ma Hao ; Zeng Shi ; Chen Liqi ; He Jianhua ; Yin Mingduan ; Ceng Xianzhang ; Ceng Wenyi

【期刊】台湾海峡

【Journal】JOURNAL OF OCEANOGRAPHY IN TAIWAN STRAIT

【期刊年份】2008

【卷】27

【期】1

【关键词】 沉积速率; 重金属; 中子活化分析; 楚科奇海; 北极

【Keywords】 sed imentary rate; heavy meta ls; INAA; Chukch i Sea; Arctic

【摘要】采用Pb-Po法测定了楚科奇海陆架沉积物中210 Pb的垂直剖面. 应用双层模型研究210 Pb分布,得到沉积速率( S )为0. 145cm /a, 沉积物堆积通量( FM )为78mg /( cm2 a) , 过剩210 Pbex 的沉积通量为6 *10- 3Bq / ( cm2 a) [即0. 36dpm / ( cm2# a) ] . 用中子活化分析方法和火焰原子吸收法分析测定了沉积物岩芯12个层段的重金属Cu、Pb、Zn、Cd、Cr、Co、Fe、Mn和V 的含量, 发现各层段之间重金属含量没有显著的区别. 将本次分析结果和北冰洋其他一些陆架区的研究结果及页岩标准值相比较, 发现楚科奇海沉积物中大部分重金属含量都相对较低. 基于此可以推断, 楚科奇海沉积物中重金属是源于地球化学过程的作用, 没有表现出受到明显的人为重金属污染影响.

【Abstract】The vertical profile o f 210 Pb in the sediment of the Chukchi Sea was determined by Pb-Po isotopic technique. By using a two-layermodel to study the distribution of 210Pb, the sedimentary rate ( S ), accumulation flux of sediment (FM ) and sedimentary flux of excess 210 Pbex were estimated to be 0. 145cm /a, 78mg / ( cm2 # a) and 6*10- 3Bq / ( cm2 # a) [ 0. 36dpm / ( cm2 # a ) ], respectively. The changes in heavy metals ( Cu, Pb, Zn, Cd, Cr, C o,Fe, Mn and V) contents in 12 layers on the sedimentary corewere analyzed and determined by instrumenta lneutron activation analysis ( INAA ) and flame atomic absorption method. It was found that the concentrations of the heavy metals in varied layers had no significant difference. Comparing the results with those of other Arctic shelfregions and themain value o f the shale, the content of the heavymetals is lower. It was concluded that the source of heavy metals in the sediment of the Chukch i Sea was from natural geochemical process and no significant anthropogenic contribution was detected in the Chukchi Sea sediments.

【基金/项目】 国家海洋局海洋生态系统与生物地球化学重点实验室开放研究基金资助项目( LMEB200705) ; 黄河站邻近湖泊沉积物中有机碳同位素研究及其古气候环境意义初探

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