STUDY OF INTERACTION OF RHODIUM (III) CHLORIDE ANIONS COMPLEX WITH THIAZINE RAW ORGANIC BASIC TRIMETHILTHIONINE

Abstract

Interaction between rhodim(III) chlorice acidocomplex and thiazine raw organic basic dye trimethylthionine has been studied. Compound forming in the system is extracted by dichloroetane–carbon tetrachloride–acetone tri-component mixture (correspondingly 2.5+2.5+5 mL) from pH 1.0 by hydrochloric medium. The maximal ligth absorption is observed at 638 nm wavelenght. The optimal concentration of dye may be provided by addition of 1.0–2.0 mL of 0.1% solution. Linear dependense of the ionic associate optimal absorption on the rhodium(III) concentration is observed within 4.04–50.8 mkg Rh per 10 mL solution range. The molar coefficient of extinction $\overline{\epsilon}_{638}=$ 1.8·10⁴ L·mol^–1·cm^–1. The influence of a series of interfering and accompanying elements on the determination of the rhodium(III) has been studied. The extraction-absorptiometric method for determination of rhodium by trimethylthionine has been elaborated.