Abstract
Evaluation of different solid electrode systems for detection of zinc, lead, cobalt, and nickel in process water from metallurgical nickel industry with use of differential pulse stripping voltammetry has been performed. Zinc was detected by differential pulse anodic stripping voltammetry (DPASV) on a dental amalgam electrode as intermetallic Ni–Zn compound after dilution in ammonium buffer solution. The intermetallic compound was observed at −375 mV, and a linear response was found in the range 0.2–1.2 mg L−1 (r 2=0.98) for 60 s deposition time. Simultaneous detection of nickel and cobalt in the low μg L−1 range was successfully performed by use of adsorptive cathodic stripping voltammetry (AdCSV) of dimethylglyoxime complexes on a silver–bismuth alloy electrode, and a good correlation was found with corresponding AAS results (r 2=0.999 for nickel and 0.965 for cobalt). Analyses of lead in the μg L−1 range in nickel-plating solution were performed with good sensitivity and stability by DPASV, using a working electrode of silver together with a glassy carbon counter electrode in samples diluted 1:3 with distilled water and acidified with H2SO4 to pH 2. A new commercial automatic at-line system was tested, and the results were found to be in agreement with an older mercury drop system. The stability of the solid electrode systems was found to be from one to several days without any maintenance needed.
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Mikkelsen, Ø., Skogvold, S., Schrøder, K. et al. Evaluations of solid electrodes for use in voltammetric monitoring of heavy metals in samples from metallurgical nickel industry. Anal Bioanal Chem 377, 322–326 (2003). https://doi.org/10.1007/s00216-003-2102-z
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DOI: https://doi.org/10.1007/s00216-003-2102-z