Abstract
A coated-wire ion-selective poly(vinyl chloride) membrane electrode based on 2,c-8,c-14,c-20-tetrabutyl-4,6,10,12,16,18,22,24-octaacetyl-resorc[4]arene, as a neutral carrier, was successfully developed for detection of Ag(I) in aqueous solution. The electrode exhibited linear response with Nernstian slope of 58±1 mV per decade within the concentration range 1×10−5−0.1 M silver ion. The limit of detection as determined from the intersection of the extrapolated linear segments of the calibration plot, was 3×10−6 M. The electrode exhibited good selectivities for Ag(I) with respect to alkali, alkaline earth and several heavy metal ions. The response time of the electrode was <20 s over the entire concentration range. The coated-wire electrodes could be used for at least two months without a considerable divergence in their potential. The electrode is suitable for use in aqueous solutions in a wide pH range of 1.5–6.0. It was used as an indicator electrode in titration of Ag(I) with sodium chloride solution.
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