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RESEARCH ARTICLE
Contents Vol 46(8)

K–Ca–Mg binary cation exchange in saline soils from the north of Chile

Manuel Gacitúa A , Mónica Antilén A C and Margarita Briceño B
+ Author Affiliations
- Author Affiliations

A Pontificia Universidad Católica de Chile, Facultad de Química, Vicuña Mackenna 4860, 6904411, Santiago, Chile.

B Universidad Arturo Prat, Av. Arturo Prat 2120 Casilla 121, Iquique, Chile.

C Corresponding author. Email: mantilen@uc.cl

Australian Journal of Soil Research 46(8) 745-750 https://doi.org/10.1071/SR07228
Submitted: 6 December 2007  Accepted: 7 October 2008   Published: 2 December 2008

Abstract

The selectivities of the K–Ca and K–Mg cation exchange reactions were studied in batch experiments carried out with 7 Chilean saline sandy soils with low organic matter (OM) content, and rich in quartz and halite, by using the experimental Gaines and Thomas procedure and the semi-empirical Rothmund–Kornfeld approach.

The soils present high reactivity to the exchange process in terms of CEC and a preference order from the surface for the cation of K > Ca > Mg. In addition, the existence of different types of exchange sites was determined; some were specific for determined cations and others presented free competition. The proposed exchange reaction for both equilibria was thermodynamically possible and the studied cations presented a decreasing mobility order K > Ca > Mg, which follows the increasing order of hydrated ionic radii.

As for the Rothmund–Kornfeld semi-empirical approach, it can be employed on soils classified as Aridisol due to good fit with the experimental data. On the other hand, the Gaines and Thomas approach is only experimentally applicable since poses some restrictions concerning to salinity and carbonate contents in the studied soils.

Additional keywords: exchange equilibria, saline soils, thermodynamic models.


Acknowledgments

Support by PROYECTO LIMITE 2007 and DIPOG 2006 of the Pontificia Universidad Católica de Chile, and financial support under FONDECYT project 11060265, and by DI-L-02/2007 from the Universidad Arturo Prat, is gratefully acknowledged.


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