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首页> 外文期刊>Electroanalysis >Potentiometric sensor for L-ascorbic acid based on EVA membrane doped with copper(II)
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Potentiometric sensor for L-ascorbic acid based on EVA membrane doped with copper(II)

机译：基于铜掺杂的EVA膜的L-抗坏血酸电位传感器

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The development of a new potentiometric sensor for L-ascorbic acid based on the redox properties of copper(II) ions incorporated in a EVA membrane was carried out. The poly(ethylene-co-vinyl acetate) matrix (EVA 40 % wt.) was doped with CU2+ ions and dispersed on the surface of a graphite/epoxy electrode. The electrode displayed a Nernstian response (slope between 55 and 60 mV/decade), in the ascorbate concentration between 5.6 x 10(-6) and 3.7 x 10(-4) mol L-1, when 0.1 mol L-1 KH2PO4 buffer at pH 5.0 and 25.0 degrees C was employed. The sensor stability was assessed, allowing 280 determinations without significant decrease in the response. The relative standard deviation for vitamin C determination in pharmaceuticals samples by the proposed method was about 10%. Considering these deviations, the results obtained for both the methods (spectrophotometric and potentiometric) were similar. [References: 34]
机译：基于结合在EVA膜中的铜离子的氧化还原特性，开发了一种新的L-抗坏血酸电位传感器。聚（乙烯-乙酸乙烯酯-共-乙酸乙烯酯）基质（EVA 40重量％）掺杂有CU 2+离子，并分散在石墨/环氧树脂电极的表面上。当使用0.1 mol L-1 KH2PO4缓冲液时，电极在5.6 x 10（-6）和3.7 x 10（-4）mol L-1之间的抗坏血酸浓度下表现出Nernstian响应（斜率在55至60 mV / decade之间）。在pH 5.0和25.0℃下使用。评估了传感器的稳定性，可以进行280次测定而响应没有明显降低。通过该方法测定药物样品中维生素C的相对标准偏差约为10％。考虑到这些偏差，两种方法（分光光度法和电位法）获得的结果相似。 [参考：34]

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