An assessment of complex formation between aluminium and silicic acid in acidic solutions

Details An assessment of complex formation between aluminium and silicic acid in acidic solutions An assessment of complex formation between aluminium and silicic acid in acidic solutions

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gecoa..58.3331f&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 58, Issue 16, pp.3331-3334

Physics

Scientific paper

The extent of the reaction A1 3+ + Si(OH) 4 AlOSi(OH) 3 2+ + H + has been assessed by measuring the shift in log[H + ] between solutions containing A1(ClO 4 ) 3 , HClO 4 , and NaClO 4 with and without added silicic acid. The observed shifts of 0.018-0.027 units are about one tenth of those predicted from the formation constant ( pK 110 = 1.07 ± 0.06) proposed for the monomeric aluminosilicate species by and (1992). An estimate of this formation constant on the basis of the shifts in log[H + ] ( pK 110 = 2.50 ± 0.05) indicates that the concentration of aluminosilicate species can be neglected in many natural waters.

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