Binary K-Ca exchange on a clay separated from a soil with dominate illite (mica) mineralogy: 1-Effect of depletion-collapse of illite (mica) on the K-Ca selectivity

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TOWFIGHI HASSAN; Khalilirad Maryam

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Journal: Iranian Journal of Soil and Water Research Year:2017 | Volume:48 | Issue:1 Page(s): 149-163

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Title

Binary K-Ca exchange on a clay separated from a soil with dominate illite (mica) mineralogy: 1-Effect of depletion-collapse of illite (mica) on the K-Ca selectivity

Author(s)

TOWFIGHI HASSAN | Khalilirad Maryam | Issue Writer Certificate

Keywords

K-Ca exchangeQ1

K-depleted illiteQ1

Ionic strengthQ1

NaTPhBQ1

SelectivityQ2

Abstract

Effects of K-depletion on K-Ca exchange equilibiria were studied in a clay separated from a soil with dominant illite (mica) mineralogy. Treatment of clay with NaTPhB+NaCl for periods of 6, 25 and 150 hours resulted in release of 22. 1, 30. 8 and 40. 7% of total K, respectively. K release was much faster at first and then gradually decreased with the time. Cation exchange capacity (CEC) of the clay increased with K-depletion, indicating that at least some of the K was released from the interlayers of the clay. Mineral weathering contributed significantly to the total extracted Ca. Thus, exchangeable Ca values overestimated by 31. 2 to 76. 7% when weathering was neglected. Anion adsorption was found to be more than negative adsorption. Comparison of exchange isotherms of K-Ca with non-preference isotherm indicated that K was preferred over calcium up to Ẽ K≤ 0. 8 in non-depleted clay and up to Ẽ K≤ 0. 76 in depleted clays. Slight preference of Ca over K was observed on Ẽ K>0. 8. Comparison of K-depleted clay’ s exchange isotherms demonstrated that selectivities of exchangers were not affected by K-depletion. A study of XRD patterns of the K-depleted clays after treatment of the clay with a solution having 0. 05 equivalent fraction of potassium showed that during the K-Ca exchange, layers were collapsed, but CEC values of these clays indicated that the layer collapse of the clays were not complete. Apparent K preference was increased with Ionic strength, and with dilution of equilibrium solution, more Ca was absorbed. The difference between the two exchange isotherms at the two different Ionic strengths was a result of valence-dilution effect.

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APA: Copy

TOWFIGHI, HASSAN, & Khalilirad, Maryam. (2017). Binary K-Ca exchange on a clay separated from a soil with dominate illite (mica) mineralogy: 1-Effect of depletion-collapse of illite (mica) on the K-Ca selectivity. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, 48(1 ), 149-163. SID. https://sid.ir/paper/225772/en

Vancouver: Copy

TOWFIGHI HASSAN, Khalilirad Maryam. Binary K-Ca exchange on a clay separated from a soil with dominate illite (mica) mineralogy: 1-Effect of depletion-collapse of illite (mica) on the K-Ca selectivity. IRANIAN JOURNAL OF SOIL AND WATER RESEARCH[Internet]. 2017;48(1 ):149-163. Available from: https://sid.ir/paper/225772/en

IEEE: Copy

HASSAN TOWFIGHI, and Maryam Khalilirad, “Binary K-Ca exchange on a clay separated from a soil with dominate illite (mica) mineralogy: 1-Effect of depletion-collapse of illite (mica) on the K-Ca selectivity,” IRANIAN JOURNAL OF SOIL AND WATER RESEARCH, vol. 48, no. 1 , pp. 149–163, 2017, [Online]. Available: https://sid.ir/paper/225772/en

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