Abstract:
The article is devoted to the extraction-photometric determination of osmium. The aim was to modify the
well known extraction-photometric determination of osmium by replacing chloroform, used as an organic
solvent in a traditional extraction system, on to water, which is the only liquid component in the layering system.
This made it possible to eliminate the toxic organic solvent from the system. The optimal conditions for
the osmium extraction were selected, taking with the fact that the consumption of thiopyrine, as an expensive
reagent, should be minimal. The results of the developed methodology for determining microgram amounts
of osmium with thiopyrine were presented by the example of a model mixture corresponding to the composition
of a platinum sponge. The interfering effect of Al (III), B (III), Bi (III), Fe (III), Au (III), Ir (II), Cd (II),
Co (II), Ca (II), Si (IV), Mg (II), Mn (II), Cu (II), Mo (VI), As (V), Ni (II), Sn (IV), Pd (II), Rh (II), Pb (II),
Ag (I), Sb (III), Te (IV), Cr (III), Zn (II) contained in a platinum sponge was investigated. The interfering effect
of copper has been established, which is eliminated by masking with ascorbic acid.
