Polarographic and Voltammetric Determination of N,N-Dimethyl-4-amino-2′-carboxyazobenzene

Abstract

1220 BAREK ET AL. its determination by tast polarography in the concentration range of 2-100 pmol I-', differential pulse polarography at a dropping mercury electrode in the concentration range of 0.2-100 pmol I-', Merentid pulse voltammetry at a hangmg mercury drop electrode in the concentration range of 0.02-10 pmol I-' and adsorptive stripping voltammetry in the concentration range of0.2-100 nmol I-'.

Voltammetric Determination of N,N‐Dimethyl‐4‐amine‐carboxyazobenzene at a Silver Solid Amalgam Electrode

“…The method of linear regression yielded the relationship E p (mV) À 66.5 pH 213.2 (correlation coefficient 0.9990) over the region of pH 3 À 11. This is in a good agreement with the relationship E p (mV) À 64.8 pH 186.7 (correlation coefficient 0.9984) over the region of pH 2 À 12 obtained for DPV at HMDE for N,Ndimethyl-4-amino-2'-carboxyazobenzene in our previous study on mercury electrodes [9]. The highest, best developed, and most easily evaluated peak was obtained at pH 5 (see Fig.…”

“…The aim of this work was to develop a differential pulse voltammetric (DPV) method for the determination of trace amounts of N,N-dimethyl-4-amino-2'-carboxy-azobenzene as a model genotoxic azo compound, using a non-toxic mercury meniscus-modified silver solid amalgam electrode and to compare the advantages and disadvantages of this electrode with those of a classical hanging mercury drop electrode [8,9]. It can bee seen from the structure of this substance (see Fig.…”

“…, which is higher than for differential pulse polarography on a dropping mercury electrode or differential pulse voltammetry on a hanging mercury drop electrode (0.4 mmol L À1 and 0.03 mmol L À1 , respectively, see [9]). However, it has been proved that m-AgSAE is a suitable sensor for the determination of micromolar concentrations of azo compounds.…”

“…Among other aspects, the solid amalgam electrodes provide good mechanical stability, simple handling and new fields of application in electrochemical techniques. It can be expected that in combination with a preliminary separation and preconcentration by means of extraction with diethyl ether [9], the limit of determination can be lowered even to nanomolar concentrations. As with polarographic and voltammetric methods on mercury electrodes, substances reducible at the same potential will interfere.…”

Derivative cathodic stripping voltammetry in the simultaneous determination of three textile dyes in aqueous solutions

“…Ultraviolet‐visible spectrophotometry has been widely employed owing to its low cost and availability . Recently, electroanalytical methods have been developed for the determination of dye concentrations that contain different chromophore groups , including anthraquinone , azo dyes, and reactive dyes .…”