渤海湾表层沉积物的中子活化分析

NEUTRON ACTIVATION ANALYSIS OF SURFACE SEDIMENTS FROM BOHAI BAY

本文用中子活化技术分析了渤海湾表层沉积物的29种元素含量,根据地球化学分类法,将其分为6大类,分析结果是,其分布比较均匀,且同类元素的分布大都有相似的变化规律,表明原子结构的相似性对元素的地球化学行为有重要影响;4号站住多数元素的偏低值与沉积物含砂质较多和铁含量较低有关;该区8个稀土元素的分布模式与地壳中的相似;可以认为该区没有As和Cr的污染;该区沉积物化学组成与大陆地壳尤其与页岩相似,表明该区沉积物主要由大陆物质组成。

The contents of 29 elements in surface sediments from Bohai Bay were determined by neutron activation analysis. Based on a classification scheme, we divided these elements into six geochemical groups and discussed their distributions. Elements in the same group show similar distribution pattern. The chemical data of Bohai Bay sediments were compared with those of East China sediments, Okinawa Trough sediments, crust and continental shale. The correlation or difference were discussed with reference to their source terms and geochemical processer. The REE pattern based on eight rare earth elements we determined is very similar to the REE pattern of crustal materials. The presant data indicatethat the sediments are derived from continental materials carried and discharged by rivers.Based on As and Cr data, there is no noticeable contamination of the sediments.