Soluble Aluminum Silicates: Stoichiometry, Stability, and Implications for Environmental Geochemistry

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Science  19 Jun 1992:
Vol. 256, Issue 5064, pp. 1667-1670
DOI: 10.1126/science.256.5064.1667


Soluble aluminum silicate (Al-Si) complexes are critical species for the development and application of geochemical models. A fluorescence probe technique was used to show that Al-Si complexes account for up to 95% of the total inorganic mononuclear Al in natural waters. The presence of these soluble Al-Si species affects the solubility of Al-Si minerals. Soluble Al-Si species may be important intermediates in the weathering reactions of primary Al-Si minerals and should be considered in dissolution models. Soluble Al-Si species may be key components controlling the formation of metastable and new stable minerals during interactions between water and rocks or soils.