Mn(III)—porphyrin‐based thiocyanate‐selective membrane electrodes: Characterization and application in flow injection determination of thiocyanate in saliva

D. V. Brown, N. A. Chaniotakis, I. H. Lee, S. C. Ma, S. B. Park, M. E. Meyerhoff, R. J. Nick, John Taylor Groves

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

The response properties of a new thiocyanate‐selective solvent‐polymeric membrane electrode are reported. The membrane contains (5,10,15,20‐tetrakis(2,4,6‐triphenylphenyl)porphyrinato)manganese(III) chloride (Mn[TPPP]CI) in a plasticized polyvinyl chloride matrix. The electrode deviates from the Hofmeister selectivity pattern by responding to thiocyanate preferentially over inorganic anions (perchlorate, chloride, iodide, and bromide) and several organic anions often present in biological samples (ascorbate, citrate, urate, and salicylate). The performance of this electrode as an ion‐selective detector in a low‐dispersion, flow‐injection system is also evaluated. While selectivity in such a nonequilibrium flow arrangement is found to be somewhat different than that observed under equilibrium conditions, the electrode's response and selectivity is still adequate to allow for measurement of thiocyanate in biological samples. This application is demonstrated via the flow‐injection analysis (FIA) detection of thiocyanate in 22 human saliva samples with good correlation to a classical colorimetric method (r = 0.981).

Original languageEnglish (US)
Pages (from-to)477-484
Number of pages8
JournalElectroanalysis
Volume1
Issue number6
DOIs
StatePublished - Nov 1989

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Electrochemistry

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