Abstract
Abstract A coated wire electrode (CWE) was prepared by use of a poly(vinyl chloride)-supported liquid membrane containing oxoethoxo(5,10,15,20-tetraphenylporphyrinato)molybdenum(V) as a carrier. CWE based on such a metallo-porphyrin complex exhibits near-Nernstian responses to varying concentrations of NaOH, NaF, and C2H5OH, especially to NaOH over a wide concentration range. The pOH response curve was influenced by certain anions other than OH− ion, but not by cations such as Li+, Na+, K+, and Cs+. The mixed solution method gave a selectivity sequence OH−>>ClO4−>NO2−>F−∼SCN−>I−>NO3−>SO3−>Br−>SO42−, with a preference for OH− over ClO4− by 104.6 and over F− (or SCN−) by 106.2. In addition, Cl− ion was found to have little interfering effect under conditions used in the measurements of selectivity coefficients. Both response-time profile and pOH-response curve scarcely varied even when CWE was stored in distilled water for 167 days.
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