Marine polyphosphate: A key player in geologic phosphorus sequestration
Marine polyphosphate: A key player in geologic phosphorus sequestration
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DOI：
10.1126/science.1151751
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发表时间：
2008-05-02
期刊：
影响因子：
56.9
通讯作者：
Brandes, Jay A.
中科院分区：
文献类型：
--
作者：
Diaz, Julia;Ingall, Ellery;Brandes, Jay A.
海洋沉积物中钙磷矿物的原位或自生形成是重要营养磷的主要汇。然而，由于典型的沉积物化学在动力学上不利于这些矿物的沉淀，其形成背后的机制仍然是一个基本的谜。在这里，我们提出的证据，从高灵敏度的x射线和电渗析技术来描述一种机制，丰富的硅藻衍生的聚磷酸盐在海洋沉积物中的磷酸钙矿物的形成中发挥关键作用。这一机制可以解释在世界各地海洋沉积物中观察到的令人困惑的磷酸钙矿物分散分布。
The in situ or authigenic formation of calcium phosphate minerals in marine sediments is a major sink for the vital nutrient phosphorus. However, because typical sediment chemistry is not kinetically conducive to the precipitation of these minerals, the mechanism behind their formation has remained a fundamental mystery. Here, we present evidence from high- sensitivity x- ray and electrodialysis techniques to describe a mechanism by which abundant diatom- derived polyphosphates play a critical role in the formation of calcium phosphate minerals in marine sediments. This mechanism can explain the puzzlingly dispersed distribution of calcium phosphate minerals observed in marine sediments worldwide.