Phosphine from rocks: Mechanically driven phosphate reduction?
Phosphine from rocks: Mechanically driven phosphate reduction?
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DOI：
10.1021/es050682w
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发表时间：
2005-11-01
影响因子：
11.4
通讯作者：
Morgenstern, P
中科院分区：
文献类型：
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作者：
Glindemann, D;Edwards, M;Morgenstern, P
天然岩石和矿物样品在矿物酸溶解过程中释放出微量的磷化氢。从粉碎的岩石样品（玄武岩、片麻岩、花岗岩、粘土、石英石卵石或大理石）中释放出更多的磷化氢（平均1982 ng PH3/kg岩石，最高6673 ng PH3/kg岩石）。磷化氢与岩石的硬度和机械粉碎能相关。PH3的产率为溶岩总磷含量的0 ~ 0.01%。在石英和方解石/大理石包裹体中，通过机械化学或“摩擦化学”风化作用，磷酸盐在岩石中的还原得到了有力的间接证据。通过摩擦涂有磷灰石的石英棒到可见的摩擦发光点，人工再现了这一机制，导致检测到磷灰石中PH3超过7万ng/kg。这种反应途径可以被认为是雷电或放电还原磷酸盐的机械化学类似物，并可能通过构造力和岩石的加工作用产生磷化氢。
Natural rock and mineral samples released trace amounts of phosphine during dissolution in mineral acid. An order of magnitude more phosphine (average 1982 ng PH3/kg rock and maximum 6673 ng PH3/kg rock) is released from pulverized rock samples (basalt, gneiss, granite, clay, quartzitic pebbles, or marble). Phosphine was correlated to hardness and mechanical pulverization energy of the rocks. The yield of PH3 ranged from 0 to 0.01% of the total P content of the dissolved rock. Strong circumstantial evidence was gathered for reduction of phosphate in the rock via mechanochemical or "tribochemical" weathering at quartz and calcite/marble inclusions. Artificial reproduction of this mechanism by rubbing quartz rods coated with apatite-phosphate to the point of visible triboluminescence, led to detection of more than 70 000 ng/kg PH3 in the apatite. This reaction pathway may be considered a mechanochemical analogue of phosphate reduction from lightning or electrical discharges and may contribute to phosphine production via tectonic forces and processing of rocks.