Abstract
A novel, water-insoluble, salt of α-Keggin-type silicotungstic heteropolyacid with hexadecylpyridinium cation (SiW12Hex) was synthesized. The salt was immobilized onto the surface of spectroscopic graphite electrodes through physical adsorption from acetone solution to produce chemically modified electrodes (SiW12Hex-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 −0.40 V (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 5×10−4 M standard solution of ethylene glycol were achieved. The recovery was 98–101 %.
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