A new experimental setup for studying the formation of phosphate binding iron oxides in marine sediments. Preliminary results
A new experimental setup for studying the formation of phosphate binding iron oxides in marine sediments. Preliminary results
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用于研究海洋沉积物中磷酸盐结合铁氧化物形成的新实验装置。
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
M. Laima
中科院分区：
文献类型：
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作者：
H. Matthiesen;T. Leipe;M. Laima
摘要 介绍了一种新的实验室方法来研究海洋沉积物中氧化还原边界处磷酸盐结合铁（III）氧化物的形成。通过在沉积物和上覆水之间放置 0.45 µm 过滤器，可以为沉积物核心提供非常明确的含氧-缺氧界面。经过 1 段时间后
$$压裂{1}{2}$$
几个月后，过滤器上覆盖着一层新鲜的氧化铁，这是由沉积物孔隙水中向上扩散的 Fe2+ 氧化形成的。通过电子探针X射线微量分析（EXPMA）研究形成的氧化铁。对于来自咸水波罗的海的沉积物核心，788 个形成颗粒的平均摩尔组成为 Fe1.00±0.13P0.55±0.06Ca0.37±0.04 加上未知量的 O、H 和 C。结果表明，颗粒具有均匀的组成，并且钙在磷酸盐结合中起着重要作用。实验室方法是氧化铁研究中原位取样的有效补充。
AbstractA new laboratory method is introduced to study theformation of phosphate binding iron(III) oxides at theredox boundary in marine sediments. A sediment core isgiven a very well-defined oxic-anoxic interface byplacing a 0.45 µm filter between the sediment andthe overlying water. After a period of 1
$$frac{1}{2}$$
months thefilter is covered with a layer of fresh iron oxides,formed by the oxidation of upward diffusing Fe2+from the sediment pore water. The formed iron oxidesare investigated by electron probe X-ray microanalysis(EXPMA). With a sediment core from the brackish BalticSea the average molar composition of 788 formedparticles is Fe1.00±0.13P0.55±0.06Ca0.37±0.04 plus unknown amounts of O, H andC. The results show that the particles have a uniformcomposition, and that calcium plays an important rolein the phosphate binding. The laboratory method is auseful supplement to in situ sampling forstudies of iron oxides.