沉积物中铁的化学相态分析进展

The Analytical Development of Low-Temperature Particulate Fe Speciation

元素铁因其在地球早期环境演化和在海洋初级生产力中的重要角色,是目前全球变化与地球化学研究的热点.铁元素的相态分析,对于深入了解其在环境中迁移、转化及生物的吸收利用,都具有重要意义.回顾沉积物中铁的化学相态分析方法发展过程,从早期的简单相态分析(degreeof pyritization,DOP),元素的顺序提取法(Tesser方法),到Raiswell和Poulton等学者提出针对Fe元素特定的相态分析法等.重点介绍较为常用的三步提取法和其在表生地球化学研究中的应用;结合目前国际上铁地球化学循环研究进展,提出Fe的化学相态分析的改进建议.

Iron geochemistry has rapidly attracted great interest for global change research over the last two decades due to its significant role in the evolution o{ earth environment and in marine primary productivity. The speciation o{ particulate iron is critical for better un- derstanding of iron transformation, transitivity and bioavailability. This paper systematically reviews the analytical development of low- temperature particulate Fe speciation, including the degree of pyritization （IX）P）, Tessier＇s sequential extraction method, and specific iron extraction procedure The application of three-step iron extraction is introduced, and some suggestions are given for the future iron speciation analysis based on the latest development of iron geochemical study.