Quantification method of size distribution of polysilicic acid in supersaturated silicic acid solution

Emi Otsu, Mayumi Etou, Hironori Ohashi, Ikuko Nishida, Shuquin Bai, Yoshihiro Okaue, Takushi Yokoyama

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In order to estimate the absolute size distribution of polysilicic acid particles in geothermal waters, the distribution coefficient (K av ) of gel permeation chromatography (GPC) for polysilicic acid particles and the hydrodynamic radius for the same polysilicic acid particles from Dynamic Light Scattering (DLS) are combined to quantify the particle size. From the combination, a quantitative relationship between the K av from GPC and the hydrodynamic radius for polysilicic acid from DLS was built up. Using this relationship, the change in particle size of polysilicic acid formed during the polymerization of silicic acid at pH 8 and 9 (initial silicic acid concentration: 800 ppm as SiO 2 ) was examined. The result showed that polysilicic acid grew to 500 and 1000 nm by 5 h at pH 9 and 8, respectively. It was found that aluminum affects the growth of polysilicic acid particles, and that the effect depends on the pH. The proposed method in this study has been proved to be valid to measure the size of polysilicic acid during the polymerization of silicic acid in solutions with relatively low silicic acid concentration, such as geothermal water.

Original languageEnglish
Pages (from-to)333-337
Number of pages5
Journalanalytical sciences
Volume29
Issue number3
DOIs
Publication statusPublished - Jan 1 2013

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

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