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首页> 外文期刊>Electroanalysis >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
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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

机译：使用新型α-Keggin型硅钨酸盐修饰的石墨电极对高碘酸盐进行安培检测，并测定防冻液中的乙二醇

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摘要

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 %. [References: 29]
机译：合成了一种新型的，不溶于水的，α-Keggin型硅钨杂多酸与十六烷基吡啶鎓阳离子的盐（SiW（12）Hex）。通过从丙酮溶液中进行物理吸附，将盐固定在光谱石墨电极的表面上，以生产化学修饰的电极（SiW（12）Hex-CMEs）。给出了可溶性硅钨酸盐以及修饰电极的一些初步电化学数据。研究了电极表面的粗糙度，表面覆盖率和pH值等参数。修饰的电极通过在pH值为4.5时于-0.40V（相对于Ag- / AgCl）的电催化还原为碘酸根，用于高碘酸盐的安培检测，并间接测定防冻液中的乙二醇。获得了在0.2-5 mM乙二醇范围内的阴极电流与乙二醇浓度的线性图。对于5 x 10（-4）M的乙二醇标准溶液，其准确度优于2.1％，重现性（相对标准偏差）为1.9％（n = 10）。回收率为98-101％。 [参考：29]

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