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首页> 外文期刊>Electroanalysis >Bismuth film electrode as an alternative for mercury electrodes: determination of azo dyes and application for detection in food stuffs
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Bismuth film electrode as an alternative for mercury electrodes: determination of azo dyes and application for detection in food stuffs

机译：铋膜电极可替代汞电极：偶氮染料的测定及其在食品中的检测应用

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摘要

Bismuth electrodes were investigated and exhibit electrochemical properties similar to mercury electrodes but with much lower toxicity. An electrochemical application of bismuth film modified glassy carbon electrode for azo dyes determination was investigated. The plating step was optimized in order to achieve its analytical efficiency. A plating potential of -0.9 V in a solution of 200 mg/L Bi(NO3)(3), 0.5 M HNO3 for 100 s yields to a suitable electrode (in terms of stability and detection). Azo dyes such as azorubine (i.e., carmoisine, E122), amaranth (E123), ponceau 4R (i.e., new coccine, E124) and allura red (E129) were determined by differential pulse voltammetry in a NaCl solution in the concentration range of few ppm to 100 ppm. The reproducibility of the signal, characterized by the relative standard deviation, was found to be less than 5%, the detection and quantification limits were few mg/L. The influence of other food components on the signal was studied and the applicability was tested on real beverages samples.
机译：对铋电极进行了研究，并显示出与汞电极相似的电化学特性，但毒性低得多。研究了铋膜修饰玻碳电极在偶氮染料测定中的电化学应用。优化电镀步骤以实现其分析效率。在200 mg / L Bi（NO3）（3），0.5 M HNO3溶液中持续100 s的电镀电位为-0.9 V（就稳定性和检测而言）。偶氮染料，如偶氮红红霉素（即卡莫伊辛，E122），a菜红（E123），丽春红4R（即新球蛋白，E124）和诱惑红（E129），是通过微脉冲伏安法在NaCl溶液中以几个浓度范围测定的ppm至100 ppm。以相对标准偏差为特征的信号重现性小于5％，检测和定量限为mg / L。研究了其他食物成分对信号的影响，并测试了实际饮料样品的适用性。

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