Ca2+ and Mg2+ adsorption by an allophanic and a humic Andisol

Osamu Nakahara, Shin Ichiro Wada

研究成果: ジャーナルへの寄稿記事

12 引用 (Scopus)

抄録

Measurements were made of Ca2+ and Mg2+ adsorption by an allophanic soil and a soil dominated by Al-humus complexes as a function of pH and ionic strength in a range from 21 to 150 mmol l-1. Both Ca2+ and Mg2+ adsorption by the two soils increased as the pH of the solution increased. Ca2+ and Mg2+ adsorption depended also on the ionic strength and it increased as the ionic strength increased. Under comparable solution conditions, the amount of Ca2+ adsorbed by the humic soil was, on a mole basis, 1.5 to 2 times that of Mg2+. The allophanic soil preferred Ca2+ over M2+, with a smaller Ca2+ adsorption/Mg2+ adsorption molar ratio of 1.4. Plotting M2+ adsorption against pH-1/2pM (M = Ca or Mg; pM is the negative logarithm of M2+ activity) yielded a single smooth curve for each soil. Based on this observation and the constancy of the total adsorbed cationic charge in monovalent-divalent cation exchange reactions in Andisols reported in the literature, it was concluded that one M2+ ion adsorbs on these soils occupying two surface functional groups.

元の言語英語
ページ(範囲)203-212
ページ数10
ジャーナルGeoderma
61
発行部数3-4
DOI
出版物ステータス出版済み - 3 1 1994

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Andisol
Andisols
adsorption
calcium
ionic strength
allophanic soils
soil
cation exchange
humus
constancy
functional group
ion exchange
ions
ion

All Science Journal Classification (ASJC) codes

  • Soil Science

これを引用

Ca2+ and Mg2+ adsorption by an allophanic and a humic Andisol. / Nakahara, Osamu; Wada, Shin Ichiro.

:: Geoderma, 巻 61, 番号 3-4, 01.03.1994, p. 203-212.

研究成果: ジャーナルへの寄稿記事

Nakahara, Osamu ; Wada, Shin Ichiro. / Ca2+ and Mg2+ adsorption by an allophanic and a humic Andisol. :: Geoderma. 1994 ; 巻 61, 番号 3-4. pp. 203-212.
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abstract = "Measurements were made of Ca2+ and Mg2+ adsorption by an allophanic soil and a soil dominated by Al-humus complexes as a function of pH and ionic strength in a range from 21 to 150 mmol l-1. Both Ca2+ and Mg2+ adsorption by the two soils increased as the pH of the solution increased. Ca2+ and Mg2+ adsorption depended also on the ionic strength and it increased as the ionic strength increased. Under comparable solution conditions, the amount of Ca2+ adsorbed by the humic soil was, on a mole basis, 1.5 to 2 times that of Mg2+. The allophanic soil preferred Ca2+ over M2+, with a smaller Ca2+ adsorption/Mg2+ adsorption molar ratio of 1.4. Plotting M2+ adsorption against pH-1/2pM (M = Ca or Mg; pM is the negative logarithm of M2+ activity) yielded a single smooth curve for each soil. Based on this observation and the constancy of the total adsorbed cationic charge in monovalent-divalent cation exchange reactions in Andisols reported in the literature, it was concluded that one M2+ ion adsorbs on these soils occupying two surface functional groups.",
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N2 - Measurements were made of Ca2+ and Mg2+ adsorption by an allophanic soil and a soil dominated by Al-humus complexes as a function of pH and ionic strength in a range from 21 to 150 mmol l-1. Both Ca2+ and Mg2+ adsorption by the two soils increased as the pH of the solution increased. Ca2+ and Mg2+ adsorption depended also on the ionic strength and it increased as the ionic strength increased. Under comparable solution conditions, the amount of Ca2+ adsorbed by the humic soil was, on a mole basis, 1.5 to 2 times that of Mg2+. The allophanic soil preferred Ca2+ over M2+, with a smaller Ca2+ adsorption/Mg2+ adsorption molar ratio of 1.4. Plotting M2+ adsorption against pH-1/2pM (M = Ca or Mg; pM is the negative logarithm of M2+ activity) yielded a single smooth curve for each soil. Based on this observation and the constancy of the total adsorbed cationic charge in monovalent-divalent cation exchange reactions in Andisols reported in the literature, it was concluded that one M2+ ion adsorbs on these soils occupying two surface functional groups.

AB - Measurements were made of Ca2+ and Mg2+ adsorption by an allophanic soil and a soil dominated by Al-humus complexes as a function of pH and ionic strength in a range from 21 to 150 mmol l-1. Both Ca2+ and Mg2+ adsorption by the two soils increased as the pH of the solution increased. Ca2+ and Mg2+ adsorption depended also on the ionic strength and it increased as the ionic strength increased. Under comparable solution conditions, the amount of Ca2+ adsorbed by the humic soil was, on a mole basis, 1.5 to 2 times that of Mg2+. The allophanic soil preferred Ca2+ over M2+, with a smaller Ca2+ adsorption/Mg2+ adsorption molar ratio of 1.4. Plotting M2+ adsorption against pH-1/2pM (M = Ca or Mg; pM is the negative logarithm of M2+ activity) yielded a single smooth curve for each soil. Based on this observation and the constancy of the total adsorbed cationic charge in monovalent-divalent cation exchange reactions in Andisols reported in the literature, it was concluded that one M2+ ion adsorbs on these soils occupying two surface functional groups.

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