Simultaneous Determination of Nickel, Cobalt, Cadmium, Lead and Copper by Adsorptive Voltammetry Using 1-Phenylpropane-1-Pentylsulfonylhydrazone-2-Oxime as a Chelating Agent

Abstract

A method for the simultaneous determination of Ni, Co, Cd, Pb, Cu by adsorptive voltammetry was developed using 1-phenylpropane-1-pentylsulfonylhydrazone-2oxime as a selective complexing agent. All five metals gave peaks that were distinctly separated by 120-220 mV, allowing their determination over a wide range of concentrations. The influence of pH, nature of the supporting electrolytes, preconcentration time and applied potential were investigated. The detection limits vary in the range 0.06-1.20 ppb, and the RSD at a concentration level of 7.81 ppb, varies in the range 2.7-5.2%. The method was applied to natural water samples.

Direct Determination of Cadmium Traces in Natural Water by Adsorptive Stripping Voltammetry in the Presence of Cupferron as a Chelating Agent

“…Additionally this work is characterised with the wide linearity range. Confronting the proposed procedure with the other AdSV procedures described in literature [19][20][21][22][23][24][25][26] it can be noticed that the obtained detection limit is comparable or lower.…”

“…Primary predominance of adsorptive stripping voltammetry (AdSV) over ASV is a potentiality to obtain lower limit detection. Only several procedures within the last 15 years have been reported for the determination of cadmium by AdSV using different complexing agents [19][20][21][22][23][24][25][26].This paper describes a novel adsorptive stripping voltammetric procedure for the determination of traces of cadmium in natural water in the presence of cupferron as a complexing ligand. Cupferron is a commonly used organic compound which can form stable complexes with many metal elements [27-31].…”

“…Unfortunately, in all AdSV procedures of cadmium determination [19][20][21][22][23][24][25][26] organic substances disturb or completely block voltammetric measurement and UV irradiation of samples before analysis is recommended. Also, in ASV procedures organic substances caused the significant interference with the distortion of stripping peaks and UV digestion of environmental samples is recommended too [10,12].…”

Simultaneous Determination of Iron, Copper, and Cadmium by Adsorptive Stripping Voltammetry in the Presence of Thymolphthalexone

“…Several chelating reagents such as pyrogallol red [6], morin [7], 1-phenylpropane-1-pentylsulfonylhydrazone-2-oxime [8], and ammonium 2-amino-cyclopentene dithiocarboxylate [9], cacein blue [ 10], already have been applied for the voltammetric determination of copper, and oxine [11], 1-(2-pyridylazo)-2,7-dihydroxy naphthalene [12], glyoxalin acid thiosemicarbazide [13], as chelating reagents for voltammetric determination of cadmium. The trace concentration of iron can be measured by AdSV using chelating reagents such as catechol [14], 1-nitroso-2-naphthol [15,16], solochrome violet RS [17,18], or 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol [19 ], PAR [20], cupferron [21], 2-(2-Thiazolylazo)-p-cresol (TAC) [22], 1,2-cyclohexanedione dioxime [23].…”

Differential Pulse Anodic Stripping Voltammetric Determination of Cadmium(II) withN-p-Chlorophenyl-cinnamohydroxamic Acid Modified Carbon Paste Electrode

“…Some of these have utilized ligands like 8-hydroxyquinoline [7], 2,5-dimercapto-1,3,4-thiadiazole [8] and 1-phenylpropane-1-pentylsulfonylhydrazone-2-oxime [9] as chelating agents.…”