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Simulation of cation exchange involving hydrogen ion in soil

, : Simulation of cation exchange involving hydrogen ion in soil. Soil Science Society of America journal 58(4): 1086-1094

A computer program for simulating cation-exchange reactions in soil was developed and used for simulating the determination of exchangeable acidity with 1 M KCl and of hydrolytic acidity with 1 M NaOAc. The acidification process resulting from extraction of an initially base-saturated soil with a dilute solution of an acid having various dissociation constant may also be simulated. From the calculated pH-base saturation relationships for assumed K-H exchange coefficient [K(K-H)] varying from 1 X 10(1) to 1 X 10(-6), it is noted that for [K(K-H)] values of 1 X 10(-n), the inflection point of the pH-base saturation curve is at the pH value of n. Thus, the permanent charge sites of mineral soils appeared to have a K(K-H) value of 1 X 10(-1) and greater, while for the pH-dependent charge sites the K(K-H) values are smaller than 1 X 10(-2). The acidity extracted by 1 M KCl solution corresponded to the H+ on the permanent charge sites, with values of 1 X 10(-2) and greater, but it may also include some portions of H+ bound on exchange sites with K(K-H) values smaller than 1 X 10(-2). Exchangeable H+ from sites with K(K-H) smaller than 1 X 10(-5) were practically not displaced by 1 M KCl solution. The use of 1 M NaOAc instead of KCl could quantitatively displace the H+ held on the sites with K(Na-H) values > 1 X 10(-3) by a single extraction, while those of 1 X 10(-6) and greater may be displaced by repeated extractions. Calculations with K(na-H) values of 1 X 10(-7) did not converge, but available soil data indicate that the pH-dependent sites of soils have K(Na-H) values in the order of 1 X 10(-7). Use of a dilute acid solution in place of KCl or NaOAc solution simulates the acidification process of acid precipitations.


DOI: 10.2136/sssaj1994.03615995005800040012x

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