Advantages and disadvantages of static mercury drop electrodes
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Mercury electrodes as a drop or a film prepared at surface of an inert subtract have been widely used in the last five decades for voltammetric (polarographic) determination of inorganic and organic species due its special characteristics like high cathodic hydrogen overpotential and its ability to dissolve many metals, aiding in the pre-concentration process . However, in the last years, due to the growth of green chemistry concepts and knowing problems related to mercury toxicity, researchers have been searching new materials for electroanalytical application with the same properties of mercury, but with lower toxicity.
Therefore, the demand for methods of determination and monitoring of trace amounts of hazardous compounds in environmental and clinical samples is continuously increasing. Many sensitive chromatographic methods for the determination of hazardous compounds in air, water, and biological matrices have been developed (Cvacka et al. 1998; Stokvis, Rosing, and Beijnen 2005) but polarographic and voltammetric methods offer less expensive and competitive alternatives (Barek et al. 2001; Barek, Moreira, and Zima 2005; Vyskocil and Barek 2009). Methyl violet 2B belongs to the group of triphenylmethane dyes.
Therefore, the demand for methods of determination and monitoring of trace amounts of hazardous compounds in environmental and clinical samples is continuously increasing. Many sensitive chromatographic methods for the determination of hazardous compounds in air, water, and biological matrices have been developed (Cvacka et al. 1998; Stokvis, Rosing, and Beijnen 2005) but polarographic and voltammetric methods offer less expensive and competitive alternatives (Barek et al. 2001; Barek, Moreira, and Zima 2005; Vyskocil and Barek 2009). Methyl violet 2B belongs to the group of triphenylmethane dyes.
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