Browsing by Author "Bubník, Jiří"

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    Polarographic determination of small amounts of nickel and cobalt in glasses and in some glass raw materials
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1992) Bubník, Jiří
    Two very sensitive methods for the determination of trace amounts of nickel and cobalt by means of adsorption stripping polarography using a hanging mercury drop electrode are described. For the accumulation the sorption properties of Ni(II) and Co(II) complexes with dimethylglyoxime or of the Co(III) complex with 1-nitroso-2-naphthol in the medium ammonia-ammonium chloride buffer was utilized. The current of the reduction of Ni(II) and Co(II) to metal or of Co(III) to Co(II) in the range from 1 to 20 μg/l was measured by fast-scan differential-pulse polarography. Using the methods described, the nickel and cobalt contents in the glass and in some glass raw materials of 0.001 to 0.00001 % can be determined with a relative error which does not exceed ± 10 %.