Composition and stability constants of cerium-chromotrope 2R chelate and the spectrophotometric determination of cerium

The composition and stability of the pinkish violet chelate of cerium-CTR (λ max 550 mμ) have been established by (i) the method of continuous variation, and (ii) mole ratio method. The stoichiometric ratio was found to be 1:1 (metal: ligand) at pH 6.0. The conditional stability constant of the chel...

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Bibliographic Details
Published in:Microchemical journal 1970-01, Vol.15 (4), p.548-556
Main Authors: Shah, Vasant L., Sangal, Satendra P.
Format: Article
Language:English
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Summary:The composition and stability of the pinkish violet chelate of cerium-CTR (λ max 550 mμ) have been established by (i) the method of continuous variation, and (ii) mole ratio method. The stoichiometric ratio was found to be 1:1 (metal: ligand) at pH 6.0. The conditional stability constant of the chelate is determined by the method of Mukherji and Dey and the mole ratio method at pH 6.0 and at 28 °C. The value of log K by the method of Mukherji and by mole ratio method are 3.81 and 4.8, respectively. Suitable conditions for the determination of the metal in micro amounts have been worked out. The range for adherence to Beer's law is 0.56–10.16 ppm. The molar absorption coefficient is 6650. Sensitivity is 1.41 γ/cm 2. The pH range suitable for determination of metal ion is 5.6–6.4. Effect of the various forms of ions on the chelate has also been studied.
ISSN:0026-265X
1095-9149
DOI:10.1016/0026-265X(70)90096-2