экстракционно-фотометрический метод

Physico-chemical methods investigated complexing Fe (II, III), Co (II) and Ni (II) with di mer kap tophenols (2,6-dimerkaptophenol, 2,6-dimercapto- 4-methylphenol, 2,6-dimercapto-4-ethy l phenol, 2,6-dimercapto-4-propylphenol and 2,6-dimercapto-4-tert-butylphenol), and hyd rophobic amines. The hydrophobic amine were used as heterocyclic diamine- 1,10-phenan thro line, 2,2’-bipyridyl and 4,7-diphenyl-1,10-phenanthroline (batofenantrolin). The optimal conditions for the formation and extraction mixedligand complexes and set the ratio of the components in the complexes.

The possibility of using hydroxythiophenols (HTP) for the photometric determination of cobalt (II) has been studied. Aminophenols (AP) were used as hydrophobic amine: 2- (N,N-methylamino methyl)-phenol (AP1) and 2- (N, N-methylaminomethyl) -4-methylphenol (AP2). Dichloroethane, chloroform and carbon tetrachloride turned out to be the best extractants. With a single extraction with chloroform, 97.5–99.5% of cobalt is recovered as a complex. The cobalt (II) complex is extracted into chloroform in the pH range of 3.6–6.3.