Mechanism for the electrochemical stripping reduction of the nickel and cobalt dimethylglyoxime complexes.
Anal Chem
; 69(9): 1782-4, 1997 May 01.
Article
em En
| MEDLINE
| ID: mdl-21639304
ABSTRACT
Reductive coulometric stripping potentiometry, a technique not hitherto described, has been used to establish that the reduction of Ni(II) and Co(II) dimethylglyoximates, adsorbed on a mercury film electrode, is a 10-electron process. Exhaustive adsorption of Ni(II) or Co(II) complexes, in the 0-4 µg L(-)(1) concentration range, was achieved by vibrationally promoted electrolysis for 3 min of â¼25 µL volume samples, hanging under the working electrode in a nitrogen atmosphere. The adsorbed complexes were reduced by means of a constant current of 50 µA. The technique was successfully used for the calibration-free determination of Ni(II) in certified seawater and river water reference samples.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
1997
Tipo de documento:
Article