渤海沉积物中的"活性铁"与其氧化还原环境的关系  

Relation of active iron and redox environments in the sediments of Bohai Sea

作　　者：李学刚[1] 吕晓霞[1] 孙云明[1] 李宁[1] 袁华茂[1] 詹天荣[1] 宋金明[1] 

机构地区：[1]中国科学院海洋研究所海洋生态与环境科学重点实验室

出　　处：《海洋环境科学》2003年第1期20-24,共5页Marine Environmental Science

基　　金：中国科学院创新重大项目(KZCX1 SW 01 08);国家杰出青年科学基金资助项目(49925614)

摘　　要：应用2001年12月航次所取得的渤海三个典型区域沉积物柱状样品,用5%HCl浸取溶解自然粒度下的沉积物,测定了其中的Fe3+、Fe2+、Fe3+/Fe2+值,探讨了其分布特征及其与沉积物氧化还原环境的关系。结果表明Fe3+在整个研究海域均是从表层向下逐渐递减的,Fe2+在辽东湾是从表层向下逐渐减小的,而在其他海域是逐渐增加的。沉积物的上层(约50cm厚)Fe2+含量变化复杂。一些柱状样Fe2+含量随深度的增加而降低,可能除与沉积物来源有关外,还与"活性铁"的总量有关,"活性铁"含量在垂直方向上随深度而降低。从"活性铁"与Fe3+/Fe2+判断,所研究的渤海区沉积环境以弱氧化环境为主,局部地区为还原环境。The distribution characteristics of Fe3+, Fe2+, Fe3+/Fe2+ ratio, and the relationship with redox environments were disscused by six core samples obtained in three typical regions of Bohai Sea in Dec. 2001.The results showed the vertical distributions of Fe3+ tend to decrease from surface to bottom in these zones. Fe2+ was decreased from surface to bottom in Liaodong Bay, but increased in other regions. The variation of Fe2+ in upper layer (0～50 cm) were very complicated,its contents alternate between high and low. The contents of Fe2+ in some core samples were decreased with depth, which may be related to the total content of active iron except its source, because the total contents of active iron were decreased with depth. Based on the results of active iron and Fe3+/Fe2+, the main redox environment characteristics in Bohai Sea is relatively weak oxidation, and is reduction in a little region.

关 键 词：活性铁 Fe^3+/Fe^2+值 氧化还原环境 渤海沉积物 

分 类 号：P736.4[天文地球—海洋地质]