A new kinetic fluorimetric method is proposed for the determination of trace cobalt, based on the catalytic oxidation of reduced fluoresceine with hydrogen peroxide in the presence of triethanolamine as activator in a basic medium. The detection limit for cobalt is 0.016 ng/ml and the linear range o
Spectrographic determination of traces of cobalt in vitamin B12 preparations
β Scribed by F. M. Farhan; M. Makhani
- Publisher
- John Wiley and Sons
- Year
- 1970
- Tongue
- English
- Weight
- 235 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0022-3549
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A spectrophotometric procedure has been developed for rapid and fairly accurate determination of vitamin BE in B complex and multivitamin preparations. Vitamin BE is determined by the measurement of difference in absorbance value (AA) in different solvents at 328 mp. HE PRESENT official U.S.P. meth
06 50.0 mg L β«1Χβ¬ (calibration graph: A β«Χ‘β¬ β«2310.0Χβ¬ β«Χβ¬ 0.0134 C, r β«Χ‘β¬ 0.9990, where A is the absorbance and C is the vitamin B 1 concentration in mg L β«1Χβ¬ ). Sucrose, glucose, fructose, lactose, citric acid, starch, vitamin B 2 , and vitamin B 6 do not interfere, even in concentrations five tim