Heterovalent cation exchange in two savanna soils of different lithogenic origin as described by the Rothmund–Kornfeld model

Yakubu, SE; Agbenin, John O.

doi:10.1016/j.geoderma.2010.04.016

Cited by 9 publications

(4 citation statements)

References 14 publications

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“…One method that can eliminate compositional incoherence is to use log-ratio models as used for illite previously (Reynolds, 2015). The Rothmund-Kornfeld model is also widely applied to ion-exchange thermodynamics and is a type of log-ratio model (Bond, 1995;Bond & Verberg, 1997;Rad & Towfighi, 2020;Reynolds, 2015;Escudey et al, 2002;Yakubu & Agbenin, 2010).…”

Section: Discussionmentioning

confidence: 99%

Compositional constraints to identifying ternary interactions in ion‐exchange equilibria

Reynolds

2021

Soil Science Soc of Amer J

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Cation exchange is one of the most important classes of reactions controlling the soil solution composition for major ions. Modeling ion-exchange equilibria is complicated by ternary solid-phase interactions. The present study alleges that spurious ternary-interactions can be reported when dilution of the exchanging ions by other ions on the solid-phase is not accounted for in models. Ion-exchange equilibria data from the NH 4 + -Ca 2+ -K + -vermiculite system is used to demonstrate that previous reports of ternary interactions in this system are an artifact of how solid-phase mole fractions are defined; what mathematicians call "compositional incoherence." A graphical method to distinguish the effects of dilution from real chemical interactions is presented using mole fractions renormalizing in the ternary system so that they are defined the same way as they are in binary systems. Potassium was shown to not influence NH 4 + -Ca 2+ exchange on vermiculite when these corrections for solid-phase dilution were used.

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Section: Discussionmentioning

confidence: 99%

Compositional constraints to identifying ternary interactions in ion‐exchange equilibria

Reynolds

2021

Soil Science Soc of Amer J

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“…Meanwhile, the low long-range correlations between Ex-K + and other variables suggest that Ex-K + did not fluctuate with slope topography. We speculate that Ex-K + was strongly retained in the clay minerals at each slope position compared to Ex-Ca 2+ (e.g., Agbenin and Yakubu, 2006;Appel et al, 2003;Yakubu and Agbenin, 2010).…”

Section: Factors Controlling Multi-scale Spatial Variability Of Soil mentioning

confidence: 93%

Seasonal changes in multi-scale spatial structure of soil pH and related parameters along a tropical dry evergreen forest slope

et al. 2011

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“…Most alkaline cation concentrations are found in groundwater. Calcium Magnesium Potassium and Sodium there are a major problem that can be anticipated in these areas [3] .The motion of elements and the rate of absorption are influenced by the soil's physical and chemical properties [4]. One of the most important factors in soil's chemical makeup is its capacity to hold onto ions on colloidal surfaces and swap them out for hydrolytic phases.…”

Section: Introductionmentioning

confidence: 99%

Binary exchange of calcium, magnesium, potassium and sodium in calcareous soils in Kurdistan region of Iraq

Al-Obaidi

Syan²

2022

IOP Conf. Ser.: Earth Environ. Sci.

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The objective of this research was to look into the binary exchange in four calcareous soils. The ion adsorption was carried by Batch equilibrium method used to saturate the soil samples with sodium, potassium, calcium and magnesium ions, separately, to get Sodium–Soil, Potassium–Soil, Calcium–Soil and Magnesium–Soil. The mean Kd (L kg–1) scores in various binary systems were arranged as follows: Calcium – Magnesium (18. 7) > Magnesium– Sodium(18.66) >Magnesium – Calcium (17.69) > Calcium – Sodium (15.59) > Magnesium – Potassium (14.31) > Calcium – Potassium (14.26) > Potassium – Sodium (6.5) >Potassium – Magnesium (6.32) > Potassium – Calcium (5.83) > Sodium – Magnesium (4.09) > Sodium – Calcium (4.01) > Sodium – Potassium (3.38).The average values of vanselow selectivity coefficients in different binary exchange systems of cation followed this order: Sodium – Potassium (9.88) > Sodium – Calcium (8.42) > Sodium – Magnesium (8.31) > Potassium – Sodium (5.92) > Potassium – Calcium (5.55) > Potassium – Magnesium (5.34) > Calcium – Potassium (3.17) > Magnesium – Potassium (3.07) > Calcium – Sodium (2.93) > Magnesium – Calcium (2.39) > Calcium – Magnesium (2.17)> Magnesium – Sodium (1.99).

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Heterovalent cation exchange in two savanna soils of different lithogenic origin as described by the Rothmund–Kornfeld model

Cited by 9 publications

References 14 publications

Compositional constraints to identifying ternary interactions in ion‐exchange equilibria

Compositional constraints to identifying ternary interactions in ion‐exchange equilibria

Seasonal changes in multi-scale spatial structure of soil pH and related parameters along a tropical dry evergreen forest slope

Binary exchange of calcium, magnesium, potassium and sodium in calcareous soils in Kurdistan region of Iraq

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