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Selective Spectrophotometric Determination of Copper in Milk with Phenanthraquinone Monothiosemicarbazone
Author(s) -
Sinha P. P.,
Kamil F.,
Sindhwani S. K.,
Singh R. P.
Publication year - 1982
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.198200028
Subject(s) - chemistry , molar absorptivity , copper , methanol , absorption (acoustics) , analytical chemistry (journal) , nuclear chemistry , chromatography , organic chemistry , physics , acoustics , optics
The red complex formed by copper (II) and phenanthraquinone monothiosemicarbazone has an absorption maximum at 530 nm with a molar absorptivity of 14000 cm −1 mole −1 . The p H range for the determination is 1.1–6.6. Optimum range of concentration for accurate determination is 0.50–3.47 ppm of copper (II) in 50% methanol medium. The limits of interference due to foreign ions have been studied. The method has been successfully employed for the determination of copper in various samples of milk.