Determination of Potassium Ion Concentration

In order to determine wither potassium fertilization is needed or not, it is important to determine the exchangeable potassium in soil samples [53]. The ion-selective potassium electrode proved applicable for these measurements [54]. A potentiometric flow injection manifold and method was worked out for solving that task by Almeida and coworkers [55]. They used the ion-selective potassium electrode built in a flow through cell. 

Grygolowicz-Pawlak and coworkers [56] fabricated two different types of potassium electrodes using valinomycin as ionophore. One was a plasticized PVC matrix-based medium-sized electrode with hydroxyethylenecellulose (HEC)-based gel as an inner electrolyte and a silver/silver chloride inner electrode. 

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P7. Pioda, L. A. R., Simon, W., Bosshard, H.-R., and Curtius, H. C., Determination of potassium ion concentration in serum using a highly selective liquid membrane electrode. Clin. Chim. Acta 29, 289-293 (1970). 

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