Extraction-photometric determination of cobalt (II) with 5- (4-Hydroxybenzylidene) -2,4-tiazolidindion in different objects

Abstract

The possibility of using 5- (4-hydroxybenzylidene) -2,4-thiazolidinedione (L) for the photometric determination of cobalt (II) has been studied. Dichloromethane, chloroform forms and carbon tetrachloride were the best extract ants. With single chloroform extraction, 97.6% of the cobalt is recovered as a complex. The cobalt (II) complex is extracted with chloroform in the pH range 4.2-5.5. The maximum analytical signal by the complex formation of cobalt with L is observed at 528 nm. The molar absorption coefficient is 3.22 × 104. The ratio of the components in the complex is Co: L = 1: 2. The extract of the cobalt complex undergoes the basic law of light absorption at a concentration of 0.25-16 μg / ml. According to the results of a spectrometric photometric study of cobalt (II) With L, methods were developed for determining cobalt in various objects.