Effect of sodium sulfite on the dissolution of amorphous silica in aqueous solution

Shuqin Bai, Shinji Urabe, Yoshihiro Okaue, Takushi Yokoyama

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Abstract

The dissolution rate and solubility of amorphous silica were determined in pure water, a sodium chloride solution and a sodium sulfite solution in the concentration range of 10 -3-10 -1 M. The initial dissolution rate (0-12 hours) was enhanced in the presence of Na +, while it was not. affected by Cl - and SO 3 2-. Although the solubility in pure water was the same as that in a NaCl solution, the solubility in a Na 2SO 3 solution increased depending on its concentration, suggesting the formation of complexes of silicic acid with sulfite ion. The conditional formation constants of the hypothetical 1:1 complex were estimated to be 105-1951 M -1 based on difference between the solubility of amorphous silica in the sodium sulfite solution and that in sodium chloride solution.

Original languageEnglish
Pages (from-to)767-773
Number of pages7
Journalbunseki kagaku
Volume54
Issue number9
DOIs
Publication statusPublished - Dec 1 2005

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All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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