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首页> 外文期刊>International Journal of Electrochemical Science >Determination of Iron in Dietary Supplements by Voltammetric Analysis at an Iodine-Coated Polycrystalline Platinum Electrode
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Determination of Iron in Dietary Supplements by Voltammetric Analysis at an Iodine-Coated Polycrystalline Platinum Electrode

机译：碘涂层多晶铂电极上的伏安法测定膳食补充剂中的铁

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An iodine-coated polycrystalline platinum electrode was applied to analysis of iron in dietary supplements. The developed method is based on scanning the potential of the iodine-coated polycrystalline platinum electrode between the hydrogen evolution limit (-0.25 V) and a potential lower than the threshold of iodine desorption from the platinum surface (ca. +0.80 V). An anodic peak centered nearly at 0.56 V is assigned to Fe(II) oxidation to Fe(III). The anodic peak current (ip) showed an excellent linearity (R2= 0.995) with the concentration of Fe2+ within a concentration range from 4- 500 ppm Fe. The anodic peak current, as expected for a diffusion controlled process showed a linear relationship with the square root of the scan rate (R2 =0.999). The limit of detection (based on S/N = 3) for the developed method is 2.34 ppm while the limit of quantitation (based on S/N = 10) is 7.8 ppm. The effect of potential interferences like calcium, magnesium, zinc, selenium, copper, manganese, chromium, molybdenum, vanadium was investigated. Silver and copper were the only ones among the investigated elements which showed resolved peaks from those of Fe (II) within the accessible potential window of the iodine-coated platinum electrode. Analysis of real samples and application of statistical tests to the results indicated the absence of systematic error in the results and the validity of the null hypothesis, i.e., there is no significant difference between the nominal values reported by the manufacturers and our results at p=0.05.
机译：涂有碘的多晶铂电极用于分析膳食补充剂中的铁。所开发的方法基于在氢放出极限（-0.25 V）和低于从铂表面解吸碘的阈值（大约+0.80 V）之间的碘涂层多晶铂电极的电势扫描。中心在0.56 V附近的阳极峰归属于Fe（II）氧化为Fe（III）。当Fe 2+的浓度在4-500 ppm Fe的范围内时，阳极峰值电流（ip）表现出极好的线性（R2 = 0.995）。如扩散控制过程所预期的那样，阳极峰值电流与扫描速率的平方根呈线性关系（R2 = 0.999）。所开发方法的检出限（基于S / N = 3）为2.34 ppm，而定量限（基于S / N = 10）为7.8 ppm。研究了钙，镁，锌，硒，铜，锰，铬，钼，钒等潜在干扰的影响。银和铜是被调查元素中仅有的那些，在碘涂层铂电极的可及电位窗口内显示出与Fe（II）峰相比分辨出的峰。实际样本的分析和对结果的统计检验的应用表明，结果中没有系统误差，并且无效假设的有效性，即，制造商报告的名义值与我们的结果在p =时没有显着差异。 0.05。

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