Construction of a triphenyltetrazolium liquid membrane ion selective electrode and its analytical application to the assay of vitamin C (Journal article)

Veltsistas, P. G./ Sikalos, T. I./ Prodromidis, M. I./ Papadimitriou, C. D./ Karayannis, M. I.

The construction of a liquid triphenyltetrazolium cation (TT+) ion-selective electrode (ISE) based on [TT+](3)[P(W3O10)(4)] salt dissolved in 2-nitrotoluene is described. The liquid membrane electrode exhibits a rapid and almost Nernstian response to triphenyltetrazolium cations in the concentration range from 2 x 10(-4) to 1 x 10(-2) mol l(-1). The Nernstian slope is 56-58 mV decade(-1) which remains constant for at least two months. The response is virtually unaffected by pH changes in the range 3-12. Major interferents are periodate and malate. Deviation from linearity is also observed in the presence of bromide, iodide and thiocyanate, due to their precipitation with triphenyltetrazolium cations. Analytical applications such as direct potentiometry for the determination of TTS in aqueous solutions and indirect potentiometry for the assay of ascorbic acid (vitamin C) in pharmaceutical preparations are described. Ascorbic acid in the range of 150-500 mg l(-1), under specified experimental conditions, can be determined with mean relative error of 1.9%.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Keywords: triphenyltetrazolium chloride,liquid membrane ion-selective electrode,ascorbic acid,potentiometry
ISSN: 0026-3672
Link: <Go to ISI>://000089984900015
Publisher: Springer-Verlag
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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