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KMID : 1059519910350020128
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Journal of the Korean Chemical Society
1991 Volume.35 No. 2 p.128 ~ p.134
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Characteristics and Preparation of Potassium Ion Selective Liquid Membrane Electrode Based on Polyurethane Matrix
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Yoo Kwang-Sik
Lee Yong-Tack
Kang Chul-Yong
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Abstract
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Previous matrices of potassium ion selective electrodes are generally based on PVC. In this study, however, the electrode membrane was prepared with polyurethane matrix containing potassium tetraphenyl borate as sensing materials and D-18-Crown-6 and 2-nitrophenyl-n-alkylethers as solvent mediator. The average life time of the K+-selective electrode based on polyurethane was 75 days which is significantly longer than PVC based one. The slope factor in linear dynamic range (1 × 10-1 ∼ 1 × 10-4 M) was 52 mV/decade. The electrode has been successfully applied to find end point in potentiometric titration of K+ with tetraphenyl borate solution in the sea water, even in the presence of several interfering cations(NH4+, Na+, Li+, Ca2+, Mg2+, Cu2+).
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