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The ammonium ion-selective electrodes (NH 4 +-ISEs) based on the tetrahydrofuran(THF)-containing-16-crown-4 derivatives, 1,4,6,9,11,14,16,19-tetraoxocycloeicosane (L 1 ) and 5,10,15,20,-tetramethyl-1,4,6,9,11, 14,16,19-tetraoxocycloeicosane (L 2 ), were prepared and the electrode characteristics were tested. The conditioned NH 4 +-ISES (E1) based on L 1 with TEHP as a plasticising solvent mediator gave best results with near-Nernstian slope of 53.9 mV/decade of activity, detection limit of 10 - 4 . 9 M, and enhanced selectivity coefficients for the NH 4 + ion with respect to an interfering K + ion (log K p o t NH 4 + , K + = -1.84). This result was compared to other ammonium ionophores reported previously, for example, that of nonactin (log K p o t NH 4 + , K + = -0.92). The proposed electrode showed no significant potential changes in the range of 3.0 < pH < 9.0.

Tetrahydrofuran-Containing Crown Ethers as Ionophores for NH+4-Selective Electrodes

Tetrahydrofuran-Containing Crown Ethers as Ionophores for NH⁺₄-Selective Electrodes