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Determination of ammonium citrate-soluble cobalt in soils and sediments
Frank Cogswell Canney, G.A. Nowlan
1964, Open-File Report 64-30
A rapid field method for the determination of cold-extractable cobalt in soils and sediments has been developed for use in geochemical prospecting. Readily available cobalt is dissolved by treating the sample with an aqueous ammonium citrate-hydroxylamine hydrochloride solution; the filtered citrate extract is then treated with 2-nitroso1-naphthol to form a...