Abstract
It is shown that the improvement of the steric accessibility of exchange centers of higher quaternary ammonium salts by replacing three long-chain radicals (octadecyl) with three methyl radicals and the addition of a neutral carrier, p-trifluoroacetylbenzoic acid heptyl ester, significantly enhance the selectivity of an oxalate-selective electrode and lower the detection limit. An electrode reversible to oxalate ions is proposed. A procedure is developed for determining oxalate ions in green and black tea.
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