Increased solubility of quartz in water due to complexing by organic compounds

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119

作者：

P Bennett，DI Siegel

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摘要：

Quartz is the most stable natural solid phase of silica. It weathers extremely slowly at the Earth's surface 1 and often resists weathering even after all other silicate minerals have been degraded. However, there is ample evidence from both ancient and modern environments indicating enhanced dissolution and mobility of silica under conditions that cannot easily be explained by the inorganic controls of quartz solubility 2 . Increased solubility of quartz has been observed particularly in soils rich in organic material; however, no direct link between dissolved organic carbon and dissolved silica has been identified 3 . Here we present evidence for an increase in the solubility of quartz in a natural water brought about by dissolved organic compounds. These compounds were produced by the biodegradation of petroleum and consist largely of a complex mixture of organic acids. We propose that silica is being complexed and mobilized by these organic acids in waters having close to neutral p H.

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关键词：

Experimental/ geochemistry groundwater hydrology minerals organic compounds quartz solubility water/ SiO 2 complexing silica complexing SiO 2 dissolution SiO 2 mobility organic-rich soils dissolved organic C petroleum-contaminated ground water system petroleum biodegradation compounds SiO 2 mobilisation N United States Berridji Minnesota USA water enhanced dissolution inorganic controls quartz solubility organic material dissolved silica natural water dissolved organic compounds organic acids pH SiO 2 H 2O / A8670E Water (environmental science) A9160 Physical properties of rocks, minerals and soil A9240K Groundwater A9240Q Water quality and water resources A9330H North America/ SiO2/bin O2 /bin Si/bin O/bin H2O/bin H2 /bin H/bin O/bin