Solubility and standard Gibbs free energy of formation of natural imogolite at 25°c and 1 atm

Shin Ichiro Wada, Yasuko Kakuto

研究成果: Contribution to journalArticle査読

14 被引用数 (Scopus)

抄録

We carried out a dissolution experiment to determine the solubility and the Gibbs free energy of formation of natural imogolite at 25°C and 1 atm. Purified gelatinous film of natural imogolite, synthetic gibbsite, and imogolite plus gibbsite were equilibrated in 1 mmol L-1 HCI solutions and Si, Al concentrations and pH were monitored during 700 d. Imogolite plus gibbsite and gibbsite systems reached an equilibrium after 120 d. The logarithmic values of the equilibrium constants of dissolution reactions were 12.10±0.01 for imogolite and 8.01±0.01 for gibbsite. The calculated Gibbs free energy of formation was -2929.19±3.28 kJ mol-1 for imogolite and -1155.11 ± 1.42 kJ mol-1 for gibbsite. These values predict that the silicic acid concentration at the imogolite-gibbsite equilibrium would be 0.120 mmol L-1.

本文言語英語
ページ(範囲)947-953
ページ数7
ジャーナルSoil Science and Plant Nutrition
45
4
DOI
出版ステータス出版済み - 12 1999

All Science Journal Classification (ASJC) codes

  • 土壌科学
  • 植物科学

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