A critical evaluation of 1 m kci-extraction method for determining exchangeable al ions in variable charge soils

Shin-Ichiro Wada

研究成果: ジャーナルへの寄稿記事

15 引用 (Scopus)

抄録

To explain why soils rich in variable charge materials often lack 1 M KCI-extractable Al ions, I proposed a mechanism, an “induced hydrolysis” of exchangeable Al ions in the presence of variable charge materials at high salt concentrations. I extracted exchangeable Al from mixtures of a montmorillonite saturated with Al and a synthetic goethite using a 1 M KCI solution. The amount of the extractable Al (per unit weight of the montmorillonite) decreased with increasing proportion of the goethite in the mixtures. I interpreted this experimental result as supporting the proposed mechanism, i.e., H+released in the hydrolysis of Al is adsorbed on the goethite in a concentrated KCI solution and this removal of H+induces further hydrolysis, resulting in the polymerization or precipitation of Al as hydroxides. I calculated the amount of monomeric, therefore extractable, Al as a function of the goethite content in the 1 M KCI-montmorillonite-goethite mixtures. The calculated amounts agreed well with the experimentally determined ones in the whole range of goethite content examined.

元の言語英語
ページ(範囲)153-160
ページ数8
ジャーナルSoil Science and Plant Nutrition
33
発行部数2
DOI
出版物ステータス出版済み - 1 1 1987

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variable charge soils
goethite
extraction method
ions
ion
montmorillonite
variable charge
hydrolysis
soil
methodology
hydroxides
salt concentration
polymerization
hydroxide
evaluation
salt

All Science Journal Classification (ASJC) codes

  • Soil Science
  • Plant Science

これを引用

A critical evaluation of 1 m kci-extraction method for determining exchangeable al ions in variable charge soils. / Wada, Shin-Ichiro.

:: Soil Science and Plant Nutrition, 巻 33, 番号 2, 01.01.1987, p. 153-160.

研究成果: ジャーナルへの寄稿記事

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AB - To explain why soils rich in variable charge materials often lack 1 M KCI-extractable Al ions, I proposed a mechanism, an “induced hydrolysis” of exchangeable Al ions in the presence of variable charge materials at high salt concentrations. I extracted exchangeable Al from mixtures of a montmorillonite saturated with Al and a synthetic goethite using a 1 M KCI solution. The amount of the extractable Al (per unit weight of the montmorillonite) decreased with increasing proportion of the goethite in the mixtures. I interpreted this experimental result as supporting the proposed mechanism, i.e., H+released in the hydrolysis of Al is adsorbed on the goethite in a concentrated KCI solution and this removal of H+induces further hydrolysis, resulting in the polymerization or precipitation of Al as hydroxides. I calculated the amount of monomeric, therefore extractable, Al as a function of the goethite content in the 1 M KCI-montmorillonite-goethite mixtures. The calculated amounts agreed well with the experimentally determined ones in the whole range of goethite content examined.

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