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한국토양비료학회 한국토양비료학회지 한국토양비료학회지 제26권 제3호
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피인용 2

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    초록·키워드

    Surface charge characteristics of Ultisol(Luisiana soil from Philippines), Alfisol(Maahas soil from Philippines), and Inceptisol(Yongji soil from Korea) were studied by way of potentiometric titration, backtitration technique, and ion adsorption method(or CEC-AEC method). The PZNC(point of zero net charge) values determined by ion adsorption method were much lower than the natural pHs in all soils, indicating that all soil samples bore net negative surface charge. The PZSE(point of zero salt effect) values determined by potentiometric titration and backtitration technique were identical in Luisiana and Yongji soils but not in Maahas soil. All soils showed higher PZSE values than PZNC values probably due to the influence of permanent negative charge. The permanent charge calculated by the theory of Uehara and Gillman(1980) occupied quite low portion of the CEC measured at pH 7 in all soils. Backtitration technique corrected errors of potentiometric titration at extreme pH. However, it still overestimate the surface charge compared with ion adsorption method. Therefore, the ion adsorption method was recommended for the surface charge measurement of the usual soils which have high negative charge components.

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      UCI(KEPA) : I410-ECN-0101-2014-521-000705016