Determination of cobalt in the presence of high concentrations of zinc by differential pulse polarography |
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| Authors: | Manfred Geiler and Rui Da Maia |
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| Affiliation: | (1) Division of the VEB Mansfeld Kombinat, Research Institute for Non-ferrous Metals, DDR-9200 Freiberg, German Democratic Republic;(2) Academy of Mining, DDR-9200 Freiberg, German Democratic Republic |
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| Abstract: | Summary Cobalt(II) can be determined in 0.1 mol/l Na3citrate + 0.1 mol/l NH4Cl + 0.08% dimethylglyoxime as supporting electrolyte in the presence of a 50 000-fold excess of zinc by differential pulse polarography. The limit of determination is 4.2×10–5 mol/l Co (2.5 mg/l). Linear calibration curves are obtained within the range of 1×10–7 to 5×10–6 mol/l cobalt without zinc and in the presence of 5×10–3 mol/l Zn. The analytical method developed is suitable for the determination of cobalt in zinc plant solutions.
Cobaltbestimmung in Gegenwart hoher Zinkkonzentrationen mit Hilfe der Differential-Puls-Polarographie |
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