Reduction and activation of phosphate on the primitive earth
Reduction and activation of phosphate on the primitive earth
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DOI：
10.1023/a:1006700512902
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发表时间：
2000-10-01
期刊：
影响因子：
--
通讯作者：
Schwartz, AW
中科院分区：
文献类型：
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作者：
De Graaf, RM;Schwartz, AW
在含有1-10%CH4的水饱和的N-2中，早先的电放电显示了将磷酸盐还原为亚磷酸盐。这一机制被认为是前生物地球上火山环境中水溶性含磷化合物的可能来源。现在我们将研究扩展到以CO2和N-2为主要组分的混合气体，并研究了引入少量H-2和CO的效果。我们发现，在还原混合物中，亚磷酸盐的转化率高得惊人，即使在H-2和CO各占1%的情况下，磷灰石也会发生几个百分点的还原。我们还证实了之前的一份报告，即由于在存在其他矿物的情况下加热矿物磷灰石而产生了聚磷酸盐。
Electrical discharges in water-saturated N-2 containing 1-10% CH4 were shown earlier to reduce phosphate to phosphite. This mechanism was suggested as a possible source of water-soluble phosphorus-containing compounds in volcanic environments on the prebiotic Earth. We have now extended our investigations to gas mixtures in which CO2 and N-2 are the main components, and studied the effect of introducing small amounts of H-2 and CO. We show that surprisingly high conversions to phosphite occur in reducing mixtures and that several percent reduction of apatite occurs even in the presence of as little as 1% each of H-2 and CO. We were also able to confirm a previous report of polyphosphate production as a result of heating the mineral apatite in the presence of other minerals.