Summary
It was found that cobalt is strongly retained on silica treated with a mixture of Aliquat 336 and nitroso-R-salt and can be separated by column extraction chromatography from cadmium, lead, zinc, mangan, nickel, copper and iron (III) which were eluted with 0.05M solution of perchloric acid. Cobalt was quantitatively eluted with 1 M perchloric acid and subsequently determined by atomic absorption spectrophotometry Cobalt was also concentrated from very dilute aqueous solutions by frontal analysis on small columns packed with the same sorbent, eluted together with a stationary phase with methanol and subsequently determined spectrophotometrically at 466nm; in this way a 500 fold concentration of cobalt was achieved permitting the determination of cobalt at the ppb level.
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Przeszlakowski, S., Kocjan, R. Extraction chromatography of cobalt and some other metals an silica treated with a mixture of Aliquat 336 and nitroso-R-salt. Chromatographia 15, 717–722 (1982). https://doi.org/10.1007/BF02261892
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DOI: https://doi.org/10.1007/BF02261892