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首页> 外文期刊>Electroanalysis >Voltammetric Determination of Nitrofurantoin at a Mercury Meniscus Modified Silver Solid Amalgam Electrode
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Voltammetric Determination of Nitrofurantoin at a Mercury Meniscus Modified Silver Solid Amalgam Electrode

机译：汞弯月面修饰的银固体汞合金电极上的伏安法测定呋喃妥因

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摘要

Electrochemical behavior of nitrofurantoin (NF) was studied by direct current voltammetry (DCV), differential pulse voltammetry (DPV), and cyclic voltammetry (CV) using a mercury meniscus modified silver solid amalgam electrode (m-AgSAE). Voltammetric behavior of NF was studied in cathodic region of potentials in dependence on pH. pH 7.0 was selected as an optimal medium for the determination of NF by both DCV and DPV, with the optimal methanol-water volume ratio of 1 : 9. In order to reduce the negative influence of electrode passivation, the suitable regeneration potentials were found (0 mV and -900 mV). The optimal conditions were found for the determination of NF in concentration ranges from 6 x 10(-6) mol L-1 to 1 x 10(-4) mol L-1 using DCV technique, and from 2 x 10(-7) mol L-1 to 1 x 10(-4) mol L-1 using DPV technique, both in the medium of methanol-Britton-Robinson buffer pH 7.0 (1 : 9). The attained limit of quantification (LOQ) of NF was 1.6 x 10(-6) mol L-1 for DCV and 8.1 x 10(-8) mol L-1 for DPV. The practical applicability of the newly developed DPV method was verified by direct determination of NF in model samples of drinking and river water, with LOQs 2.2 x 10(-7) mol L-1 and 2.5 x 10(-7) mol L-1, respectively.
机译：硝基呋喃妥因（NF）的电化学行为通过直流伏安法（DCV），微分脉冲伏安法（DPV）和循环伏安法（CV）使用汞弯月形修饰的银固体汞齐电极（m-AgSAE）进行了研究。研究了在电位的阴极区域中依赖于pH值的NF伏安行为。选择pH 7.0作为DCV和DPV测定NF的最佳介质，甲醇与水的最佳体积比为1：9。为减少电极钝化的负面影响，找到了合适的再生电位（ 0 mV和-900 mV）。发现了使用DCV技术测定NF浓度范围从6 x 10（-6）mol L-1到1 x 10（-4）mol L-1以及2 x 10（-7）的最佳条件使用DPV技术将mol L-1转换为1 x 10（-4）mol L-1，两者均在甲醇-Britton-Robinson缓冲液pH 7.0（1：9）的介质中进行。 DC的NF定量限（LOQ）为1.6 x 10（-6）mol L-1，DPV为8.1 x 10（-8）mol L-1。通过直接测定饮用水和河水模型样品中的NF，LOQ为2.2 x 10（-7）mol L-1和2.5 x 10（-7）mol L-1来验证新开发的DPV方法的实际适用性， 分别。

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