Colorimetric Determination of Cobalt with Beta-Nitroso-Alpha-Naphthol

The Distribution of Radioactive Cobalt in Pigs

“…Dr S. Ball determined the total cobalt in the liver from each pig by the /3-nitroso-anaphthol method (cf. Yoe & Barton, 1940) and obtained values of 2-3 and 3-2 pg./IoO g. respectively. These amounts are much less than those found in ox liver, but are higher than the figures (0.95 and 0.94 pg./Ioo g.) calculated from the radioactivity results on the assumption that there had been a complete turnover of cobalt during the experiment.…”

Cobalt Determination in Soils and Rocks with 2-Nitroso-1-naphthol

“…Interferences. Other metals which form complexes with 2-nitroso-l-naphthol include: copper, iron, manganese, and nickel (11), chromium and tin (4), and palladium and zirconium (7). Various metals were tested for possible interference effects.…”

“…This compound, formerly named ß-nitroso-a-naphthol, was reported by Ilinski (8) to give reddish brown cobalt precipitates. Yoe and Barton (11) described quantitative colorimetric studies with this reagent.…”

Separation by Paper Chromatography and Spectrophotometric Determination of Trace Amounts of Cobalt, Nickel, Copper, and Zinc

“…The potentialities as an analytical technique were pointed out by Reilley, Everett, and Johns (14). Nicholson and Karchmer obtained excellent results in routine determinations of lead ion (12). Gierst has recently reported on equipment for chronopotentiometry capable of very rapid results with high pre-cision (4).…”