The stability of aluminum silicate complexes in acidic solutions from 25 to 150 degrees C

被引：80

作者：

Pokrovski, GS ^{[1
]}

Schott, J ^{[1
]}

Harrichoury, JC ^{[1
]}

Sergeyev, AS ^{[1
]}

机构：

[1] ST PETERSBURG STATE UNIV,DEPT CHEM,ST PETERSBURG 199004,RUSSIA

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 1996年 / 60卷 / 14期

关键词：

D O I：

10.1016/0016-7037(96)00123-8

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The equilibrium constant of the reaction Al3+ + H4SiO40 (ag) = AlH3SiO42+ + H+ (K-1) has been determined at temperatures from 25 to 150 degrees C from the pH of aqueous solutions containing H4SiO4(aq), HCl, and KCl with and without added AlCl3. Log K-1 values obtained in this study at 25, 90, and 150 degrees C are -2.38 +/- 0.10, -0.35 +/- 0.20, and 1.07 +/- 0.30, respectively. These values are linearly related to the reciprocal temperature and yield an association enthalpy of 66.6 kJ/mol. The K-1 value derived at 25 degrees C is in close agreement with that determined by Farmer and Lumsdon (1994) and implies that aluminum silicate complexes do not play a significant role in most surficial natural waters. However, thermodynamic calculations indicate that these complexes form in significant amounts in acid (pH <3) hydrothermal solutions where they can affect the solubility of Al/Si-bearing minerals.

引用

页码：2495 / 2501

页数：7

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