Characterization of Potassium-Selective Optode Membranes Based on Neutral lonophores and Application in Human Blood Plasma

K. WANG; K. SEILER; W. E. MORF; U. E. SPICHIGER; W. SIMON; E. LINDNER; E. PUNGOR

doi:10.2116/analsci.6.715

K. WANG, K. SEILER, W. E. MORF, U. E. SPICHIGER, W. SIMON, E. LINDNER, E. PUNGOR

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Keywords: Chromoionophores, ion-selective membranes, optode membranes, potassium concentration in plasma

JOURNAL FREE ACCESS

1990 Volume 6 Issue 5 Pages 715-720

DOI https://doi.org/10.2116/analsci.6.715

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Abstract

Plasticized PVC membranes incorporating conventional potassium-selective neutral ionophores and a neutral H⁺- selective chromoionophore have been used as reversible sensing devices for an optical determination of K⁺ activities in pH-buffered solutions. Dynamic range, reproducibility, response time, and selectivity of the new optode membranes are discussed. With this potassium-selective membrane, the reversible optical determination of total K⁺ concentration in human blood plasma is available. Results are compared to measurements with ion selective electrodes and flame photometry.

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