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首页> 外文期刊>Electroanalysis >Heavy metals in matrices of food interest: Sequential voltammetric determination at trace and ultratrace level of copper, lead, cadmium, zinc, arsenic, selenium, manganese and iron in meals
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Heavy metals in matrices of food interest: Sequential voltammetric determination at trace and ultratrace level of copper, lead, cadmium, zinc, arsenic, selenium, manganese and iron in meals

机译：食品相关基质中的重金属：膳食中痕量铜，铅，镉，锌，砷，硒，锰和铁的痕量和超痕量含量的顺序伏安法测定

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摘要

The voltammetric methods are very suitable and versatile techniques for the simultaneous metal determination in complex matrices. The present work, regarding the sequential determination of Cu(II), Pb(II), Cd(II), Zn(II) by square-wave anodic stripping voltammetry (SWASV), As(III), Se(IV) by square-wave cathodic stripping voltammetry (SWCSV) and Mn(II), Fe(III) by square-wave voltammetry (SWV) in matrices involved in foods and food chain as wholemeal, wheat and maize meal, are an interesting example of the possibility to sequentially determine each single element in real samples. Besides the set up of the analytical method, particular attention is aimed either at the problem of possible signal interference or to show that, using the peak area A(p) as instrumental datum, it is possible to achieve lower limits of detection. The analytical procedure was verified by the analysis of the standard reference materials: Wholemeal BCR-CRM 189, Wheat Flour NIST-SRM 1567a and Rice Flour NIST-SRM 1568a. Precision, as repeatability, and accuracy, expressed as relative standard deviation and relative error, respectively, were lower than 6% in all cases. In the presence of reciprocal interference, the standard addition method considerably improved the resolution of the voltammetric technique. Once set up on the standard reference materials, the analytical procedure was transferred and applied to commercial meals sampled on market for sale. A critical comparison with spectroscopic measurements is also discussed.
机译：伏安法非常适合同时用于复杂基质中的金属测定的通用技术。关于通过方波阳极溶出伏安法（SWASV），As（III），Se（IV）的方形顺序测定Cu（II），Pb（II），Cd（II），Zn（II）的最新工作食品和食物链涉及的基质（全麦，小麦和玉米粉）中的方波伏安法（SWV）进行波阴极溶出伏安法（SWCSV）和Mn（II），Fe（III）是一个有趣的例子，顺序确定真实样本中的每个元素。除了设置分析方法外，还特别关注可能的信号干扰问题，或者表明，使用峰面积A（p）作为仪器数据，可以实现较低的检测限。通过分析标准参考物质：全麦BCR-CRM 189，小麦粉NIST-SRM 1567a和米粉NIST-SRM 1568a，验证了该分析方法。在所有情况下，分别表示为相对标准偏差和相对误差的精度（以重复性表示）和精度均低于6％。在存在相互干扰的情况下，标准添加方法极大地提高了伏安技术的分辨率。一旦建立了标准参考物质，分析程序便被转移并应用于在市场上出售的商业样品。还讨论了与光谱测量的关键比较。

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