Amperometric determination of sulfide at a pre-oxidised nickel electrode in acidic media.
The electrochemical response of a pre-oxidised nickel electrode to increasing additions of sulfide has been examined and shown to produce a stripping-like voltammetric wave. A mechanism is described based on the formation of nickel sulfide at the electrode surface from a non-electroactive nickel oxide layer. The analytical utility of the approach has been examined and a linear range from 1 to 140 microM and a limit of detection of 0.8 microM is achievable, depending on the accumulation time.
Giovanelli
Debora
D
Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, UK OX1 3QZ.
Lawrence
Nathan S
NS
Jiang
Li
L
Jones
Timothy G J
TG
Compton
Richard G
RG
D000393:Air Pollutants / Q000032:analysis*; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D009532:Nickel; D013056:Spectrophotometry, Ultraviolet; D013440:Sulfides / Q000032:analysis*
D000393:Air Pollutants; D013440:Sulfides; D009532:Nickel