Abstract
A variety of neutral carrier-type ionophores were employed to prepare cation-selective electrodes for use as a detector in single-column ion chromatography. A polymer membrane electrode doped with a new siloxane-based bis-crown ether exhibited similar selectivity to ammonium and all alkali metal ions except lithium. The lithium ion selectivity was induced by further incorporating an appropriate amount of lithium ionophore ETH 1810 into the bis-crown ether-doped membrane. A single-ionophore membrane electrode doped with monensin methyl ester, known as a sodium ionophore, was shown to exhibit the most comparable sensitivity towards all alkali metal ions and ammonium ion.
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