Solubility and Standard Gibbs Free Energy of Formation of Natural Imogolite at 25℃ and 1 atm

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概要

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• We carried out a dissolution experiment to determine the solubility and the Gibbs free energy of formation of natural imogolite at 25℃ and 1 atm. Purified gelatinous film of natural imogolite, synthetic gibbsite, and imogolite plus gibbsite were equilibrated in 1 mmol L^<-1> HCl 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 quilibrium 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>.

• 社団法人日本土壌肥料学会の論文

著者

• Wada Shin-ichiro

  Division Of Bioresource And Environmental Sciences Graduate School Of Kyushu University

• Kakuto Y

  Division Of Bioresources And Environmental Sciences Graduate School Of Kyushu University

• Kakuto Yasuko

  Division of Bioresources and Environmental Sciences, Graduate School of Kyushu University

関連論文

• Solubility and Standard Gibbs Free Energy of Formation of Natural Imogolite at 25℃ and 1 atm
• PREPARATION AND CHARACTERIZATION OF THICK AND STABLE SOL OF β-FeOOH NANO-PARTICLES
• Formation and Properties of Hydroxy Iron (III) Oligomer-Citrate Complex

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