Assessment of the Tessier and BCR sequential extraction procedures for elemental partitioning of Ca, Fe, Mn, Al, and Ti and their application to surface sediments from Chinese continental shelf
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摘要: 边缘海(黄、东海)沉积物可以提供水体中广泛的信息。Tessier和BCR方法被广泛的应用于沉积物中不同地球化学相的提取。为了选取适用于第四纪大陆架沉积物不同相态的提取方法,我们进行了两种方法提取典型单一矿物的有效性和选择性实验,并且对每种方法提取天然沉积物(沉积物标准品GSD-9和3个表层沉积物)进行了评价,分析了提取液中地球化学代表性元素Ca、Fe、Mn、Al、Ti。结果表明,两种方法提取不同的地球化学相均具有很好的选择性和有效性,并且给出了两种方法每个形态的提取试剂体积的最佳用量。考虑到实际研究中吸附-解吸过程的重要性,我们推荐Tessier方法,同时利用Tessier方法提取表层沉积物提供了生产力和沉积物环境方面的信息。以上结果进一步说明Tessier方法适用于中国大陆架沉积物元素形态的提取。Abstract: Surface sediments can integrate a wide variety of information of seawater in marginal seas, e.g., the Quaternary sedimentary shelf such as the East China Sea (ECS) and Yellow Sea (YS). The Tessier and BCR sequential extraction procedures (SEPs) have been widely applied for extraction of various geochemical phases from sediments. To choose a suitable SEP for phase extraction of sediments from the above Quaternary sedimentary shelf, efficiency and selectivity experiments were conducted on typical individual minerals and the applicability of each SEP was assessed for natural sediments (the natural sediment standard GSD-9 and three surface sediment samples). The geochemical represented elements (Ca, Fe, Mn, Al, and Ti) were measured using both SEPs. Both SEPs have good dissolution efficiency and selectivity for the targeted geochemical phases; the optimized extractant volume for each fraction was determined. The Tessier SEP is particularly recommended for the study of adsorption-desorption process. The application of the Tessier SEP to surface sediments can furnish valuable information, including the productivity conditions (via the reducible fraction Mn) and sedimentary environments (via the carbonate fraction Ca). These results confirm that the Tessier SEP is suitable for elemental fractionation in sediments from the Chinese continental shelf.
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Key words:
- elemental fractionation /
- surface sediments /
- Tessier SEP /
- BCR SEP /
- efficiency /
- selectivity
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