Abstract A new indirect voltammetric method for the determination of molybdenum in water samples and food supplements using various polymer film modified pencil graphite electrodes (PFMPGEs) was described. Poly Eriochrome black T film modified pencil graphite electrodes (p-EBT/PGE), poly xylenol orange modified pencil graphite electrodes (p-XO/PGE) and poly methyl red modified pencil graphite electrodes (p-MR/PGE) were used for this purpose. The electrodes were characterized by electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy. The method is based on measuring the oxidation current of Tiron in the Mo-Tiron complex at the PFMPGEs. The limits of detection and analytical ranges for p-EBT/PGE, p-XO/PGE, and p-MR/PGE were estimated to be 2.60, 3.50, and 1.56 μg/L and 8.66 to 100, 11.68 to 100, and 5.20 to 100 μg/L, respectively. The averages of relative standard deviation values for low, medium and high molybdenum content for p-EBT/PGE, p-XO/PGE and p-MR/PGE were 5.46%, 6.30%, and 4.69%, respectively. Selectivity studies were also performed for all electrodes. The method was applied to the determination of molybdenum in water and food supplement samples. The results were statistically evaluated, and the accuracy of the proposed method was demonstrated.

中文翻译：

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使用聚合物薄膜改性铅笔石墨电极伏安法测定钼

摘要 描述了一种使用各种聚合物膜改性铅笔石墨电极 (PFMPGE) 测定水样和食品补充剂中钼的新间接伏安法。聚铬黑T膜改性铅笔石墨电极（p-EBT/PGE）、聚二甲酚橙改性铅笔石墨电极（p-XO/PGE）和聚甲基红改性铅笔石墨电极（p-MR/PGE）目的。通过电化学阻抗谱和X射线光电子能谱对电极进行表征。该方法基于在 PFMPGE 处测量 Mo-Tiron 复合物中 Tiron 的氧化电流。p-EBT/PGE、p-XO/PGE 和 p-MR/PGE 的检测限和分析范围估计为 2.60、3.50 和 1.56 μg/L 和 8.66 至 100、11.68 至 100 和 5.20至 100 μg/L，分别。p-EBT/PGE、p-XO/PGE 和 p-MR/PGE 的低、中和高钼含量的相对标准偏差值的平均值分别为 5.46%、6.30% 和 4.69%。还对所有电极进行了选择性研究。该方法用于测定水和食品补充剂样品中的钼。结果进行了统计评估，并证明了所提出方法的准确性。