Extraction systems for the flame atomic absorption spectrometric determination of trace amounts of impurities in high-purity cobalt salts

摘要: Various extraction systems including HCl-long-chain quaternary alkylammonium salts-ammonium pyrrolidine dithiocarbamate (APDC)-organic solvents were investigated in order to determine the optimum conditions for extractive separation and concentration of trace amounts Ag, Bi, Cd, Cu, Fe, Mo, Pb, Sb Zn from high-purity CoSO4, CoCl2, Co(OOCCH3)2, CoCO3 Co(NO3)2. The best results multi-element pre-concentration obtained with system 2 mol l–1 HCl-2% methyltrioctylammonium chloride-0.001 APDC-isobutyl methyl ketone. This mixed ligands permits flame atomic absorption spectrometric determination 5 × 10–6% Cd Zn, 1 10–5% Fe Pb Mo cobalt salts a single step.