POTENTIOMETRIC DETERMINATION OF POTASSIUM Q/I RELATIONSHIPS.

Document Type

Article

Publication Date

1-1-1988

Abstract

Methods of determining potassium quantity-intensity (Q/I) relationships with ion-selective electrodes (ISEs) were developed and evluated with three Iowa soils. In doing so, soil suspensions and their filtrates were characterized with single-ISE left bracket ISE(S) right bracket and dual-ISE left bracket ISE(D) right bracket procedures, the ISEs were calibrated in terms of ion concentrations to obtain Q/I relationships based on concentration ratios (CR) and the results were compared with those obtained by conventional analyses of the filtrates by atomic absorption spectrometry (AAS). By using ISEs with filtrates from soil suspensions that were equilibrated for 18 h, it was established that the ISE(S) and ISE(D) methods yield essentially the same Q/I curves and related parameters as the reference AAS method. The ISE methods provide a simple and rapid means of obtaining the necessary data.

Publication Source (Journal or Book title)

Soil Science Society of America Journal

First Page

657

Last Page

662

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