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Cadmium yellow detection and quantification by voltammetry of immobilized microparticles

机译：固定化微粒的伏安法对镉黄的检测和定量

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摘要

Cadmium pigments (cadmium sulfide and cadmium sulfoselenide) produce intense colorings such as yellow, orange and red, and are well-known pigments in artists' colors, plastics, glasses, ceramics and enamels. This makes cadmium yellow a widespread pigment and hence is very interesting to develop a simple and fast procedure for its identification. Here we propose a straightforward procedure that is harmless to the sample allowing its application to valuable samples and also to very small samples. Three different electrochemical procedures were developed for the identification and quantification of CdS. They are based on voltammetry of immobilized microparticles that suffer a reductive scan at 60 mVs(-1) from +0.30 V to -1.00 V producing peaks whose potential allows identification of the pigment. For quantitative purposes a pretreatment of -1.50 V for 10 s was applied and then an oxidative scan was performed. The relative position of the Cd oxidation peak to the peak potential of an internal standard (AgCl) was used to proceed to the calibration.
机译：镉颜料（硫化镉和硫化硒化镉）产生强烈的着色，例如黄色，橙色和红色，并且是艺术家颜料，塑料，玻璃，陶瓷和搪瓷中众所周知的颜料。这使镉黄成为一种广泛的色素，因此开发一种简单快速的鉴定方法非常有趣。在这里，我们提出了一种对样品无害的简单方法，允许将其应用于有价值的样品以及非常小的样品。开发了三种不同的电化学程序用于CdS的鉴定和定量。它们基于固定化微粒的伏安法，固定化微粒在+0.30 V至-1.00 V的60 mVs（-1）下进行还原扫描，产生峰，其电位可识别颜料。为了定量，对-1.50 V进行了10秒钟的预处理，然后进行了氧化扫描。 Cd氧化峰相对于内标（AgCl）峰电位的相对位置用于进行校准。

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