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Talanta. 1995 Dec;42(12):1905-11.

Spectrophotometric determination of scandium based on the cocoloration effect in scandium-cerium-p-acetylchlorophosphonazo (CPApA) system.

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Department of Chemistry, East China Normal University, 3663 Zhong Shan Road(N), Shanghai 200062, People's Republic of China.


Scandium in the presence of cerium(III) forms, with p-acetylchlorophosphonazo (CPApA), a heteropolynuclei ternary beta-complex of scandium-cerium-CPApA. The complex gives a very sensitive reaction for scandium with a molar absorptivity of epsilon(Sc) = 2.29 x 10(5) l mol(-1) cm(-1) due to the cocoloration effect. Most foreign ions can be tolerated in considerable amounts. The optimum conditions and the mechanism of the complex formation reaction are discussed. A simple method is proposed for the determination of scandium in alloys, with satisfactory results.

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