ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Some heterocyclic azo-compounds as analytical reagents .24. 2-(2-hydroxynaphthylazo)-7-oxo-5,5-dimethyl-4,5,6,7-tetrahydrobenzothiazole as a chelate-forming extraction reagent for copper(II), zinc(II), nickel(II), and cadmium(II)

M. Vačková and M. Petro

Department of Analytical Chemistry, Faculty of Natural Sciences, Komenský University, CS-842 15 Bratislava

Abstract: The chelates of 2-(2-hydroxynaphthylazo)-7-oxo-5,5-dimethyl-4,5,6,7-tet- rahydrobenzothiazole with Cu(II), Zn(II), Ni(II), and Cd(II) were studied spectrophotometrically. The molar absorption coefficients and stability con­ stants of chelates were calculated. The applicability of this reagent to extraction was examined. The region of optimum extraction as well as the constants of extraction into chloroform, carbon tetrachloride, and methyl isobutyl ketone was determined for the chelates of the investigated reagent with the above metal cations. The synergistic influence of trioctylphosphine oxide on the extraction of cadmium into chloroform and methyl isobutyl ketone was confirmed.

Full paper in Portable Document Format: 402a247.pdf

Chemical Papers 40 (2) 247–255 (1986)