Magnesium Ion Selective Electrodes Based on β-Diketone Compounds

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Abstract
The ion selectivities for poly(vinyl chloride) (PVC)-matrix membrane ion-selective electrodes based on seven lipophilic diketone compounds were examined. All the electrodes based on the tested five β-diketone cómpounds exhibited clear Mg2′-selectivity under high pH conditions (pH10). Especially, the electrode based on 2-acetyl-1-tetralone shows excellent Mg2+-selectivity, and the selectivity coefficients of the Mg2+ -electrode to Ca2+, K+ and K+ (log Kpot mg, ca log Kpol mg.k and log Kpot Mg.Na) in pH 10 solution were −2.2, −1.9 and −2.7, respectively. This elecrode gave a response slope of about 60 mV/pMg2+ ranging from 1 × 10−2 to 2 × 10−2, which corresponds to twice the usual Nernstian theoretical responce slope for the divalent cation. This phenomenon is advantageous for the acccurate determination of Mg2+.

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