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Simultaneous Determination of Nickel and Cobalt Using a Solid Bismuth Vibrating Electrode by Adsorptive Cathodic Stripping Voltammetry
Author(s) -
Alves Georgina M. S.,
Magalhães Júlia M. C. S.,
Soares Helena M. V. M.
Publication year - 2013
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201200643
Subject(s) - dimethylglyoxime , cathodic stripping voltammetry , cobalt , nickel , chemistry , bismuth , stripping (fiber) , electrode , square wave , adsorptive stripping voltammetry , inorganic chemistry , metal , detection limit , voltammetry , analytical chemistry (journal) , electrochemistry , materials science , chromatography , physics , organic chemistry , voltage , quantum mechanics , composite material
A simple, fast, sensitive and greener voltammetric procedure for simultaneous analysis of nickel (Ni) and cobalt (Co) by square wave adsorptive cathodic stripping voltammetry (SW‐AdCSV) using a solid bismuth vibrating electrode is presented for the first time. The procedure enables to determine Ni together with Co, in ammonia buffer 0.1 M (pH 9.2) and in the presence of oxygen, and involves an adsorptive accumulation of metal‐dimethylglyoxime (Ni‐DMG and Co‐DMG) complexes on the electrode surface. For Ni and Co, the detection limits, obtained with 30 s of accumulation time, were 0.6 and 1.0 µg L −1 , respectively. The method was free of metals (Cd 2+ , Cr 3+ , Cr 6+ , Cu 2+ , Fe 3+ and Pb 2+ up to 50 µg L −1 , Al 3+ and Mn 2+ up to 500 µg L −1 ; Zn 2+ up to 300 µg L −1 ) interferences up to the concentrations mentioned in brackets. The proposed method was validated for simultaneous determination of Ni and Co in a certified reference surface and river waters with good results.