Trace and selective determination of cobalt(II) in water and salt samples using cathodic adsorptive stripping voltammetry in the presence of pyrogallol red

A sensitive and selective procedure is presented for voltammetric determination of cobalt. The procedure involves an adsorptive accumulation of cobalt pyrogallol red (PGR) complex on stationary mercury drop electrode, followed by cathodic stripping voltammetry measurement of reduction current of ads...

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Bibliographic Details
Published inJournal of the Serbian Chemical Society Vol. 78; no. 5; pp. 717 - 724
Main Authors Hasanpour, Foroozan, Teimori, Hossein, Fouladgar, Masoud, Taei, Masoumeh
Format Journal Article
LanguageEnglish
Published Belgrade Journal of the Serbian Chemical Society 2013
Serbian Chemical Society
Subjects
Accumulation
adsorptive cathodic stripping voltammetry
Adsorptivity
Co determination
Cobalt
Mercury (metal)
pyrogallol red
Quality
Silver
Stripping
Voltammetry
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Summary:A sensitive and selective procedure is presented for voltammetric determination of cobalt. The procedure involves an adsorptive accumulation of cobalt pyrogallol red (PGR) complex on stationary mercury drop electrode, followed by cathodic stripping voltammetry measurement of reduction current of adsorbed complex at -1.17 V (vs. Ag/AgCl). The optimum conditions for determination of cobalt include pH 11.0, 35 ?M pyrogallol red, an accumulation potential of -0.9 V (vs. Ag/AgCl) and scan rate 80 mVs-1. The peak current is proportional to the concentration of cobalt over the concentration range of 5.0 to 280 ng mL-1 with a detection limit of 1 ng mL-1 with an accumulation time of 140 s. The method was applied for the determination of cobalt in analytical grade NaCl and water samples. nema
ISSN:0352-5139
1820-7421
DOI:10.2298/JSC120305070H