Amperometric detection of periodate using a graphite electrode modified with a novel alpha-Keggin-type silicotungstic acid salt and determination of ethylene glycol in antifreeze fluids (Journal article)

Prodromidis, M. I./ Veltsistas, P. G./ Efstathiou, C. E./ Karayannis, M. I.

A novel, water-insoluble, salt of alpha -Keggin-type silicotungstic heteropolyacid with hexadecylpyridinium cation (SiW(12)Hex) was synthesized. The salt was immobilized onto the surface of spectroscopic graphite electrodes through physical adsorption from acetone solution to produce chemically modified electrodes (SiW(12)Hex-CMEs). Some preliminary electrochemical data of soluble silicotungstate salts as well as of the modified electrode are given. Parameters such as the roughness of the electrode surface, the surface coverage and pH effect were investigated. The modified electrode was employed for the amperometric detection of periodate through its electrocatalytic reduction to iodate at -0.40V (vs. Ag-/AgCl) at pH 4.5 and for the indirect determination of ethylene glycol in antifreezing fluids. Linear plots of cathodic current versus the ethylene glycol concentration in the range of 0.2-5 mM ethylene glycol were obtained. An accuracy better than 2.1% and a reproducibility (relative standard deviation) of 1.9% (n = 10) for a 5 x 10(-4) M standard solution of ethylene glycol were achieved. The recovery was 98-101 %.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας
Keywords: alpha-keggin-type silicotungstates salt,periodate electrocatalytic reduction,ethylene glycol,antifreeze fluids,electrochemical-behavior,polymeric matrices,oxidation,2,6-dichlorophenolindophenol,heteropolyanions,electrocatalysis,polyaniline,activation,reduction,sulfide
ISSN: 1040-0397
Link: <Go to ISI>://000170524600012<960::AID-ELAN960>3.0.CO;2-L/asset/960_ftp.pdf?v=1&t=h0dzx05j&s=025cc04e9028c27ef34dc0436a4f8e735093abc9
Publisher: WILEY-VCH Verlag
Appears in Collections:Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

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