Extractive photometric determination of vanadium with catechol and a tertiary amine.
Metal catechol complexes can be extracted from aqueous solution with chloroform in the presence of tertiary amines, for example diphenylguanidine, tributylamine or collidine. Collidine can also be used for the determination of vanadium, titanium, molybdenum and niobium in the presence of a small amount of iron or tantalum. The method for determination of microgram amounts of vanadium is described.
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Central Geological Survey Prague, Czechoslovakia.