title: Mechanism for the electrochemical stripping reduction of the nickel and cobalt dimethylglyoxime complexes.
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 ∼25 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.
authors.affiliation: Department of Analytical and Marine Chemistry, University of Göteborg, S-412 96 Göteborg, Sweden.
authors.forename: F
authors.initials: F
authors.lastname: Ma
authors.forename: D
authors.initials: D
authors.lastname: Jagner
authors.forename: L
authors.initials: L
authors.lastname: Renman