Selection of reagents for voltammetric analysis of samples containing simultaneously Al(III),
Ga(III), In(III), Sc(²²²)
or REE(²²²)
Chem.
Met. Alloys 8 (2015) 10-15
https://doi.org/10.30970/cma8.0297
Liliya DUBENSKA, Sofija TVORYNSKA, Solomiya PYSAREVSKA, Julija RAK
The possibility of simultaneous polarographic determination of two metals with azo dyes (eriochrome blue SE, kalces, eriochrome red B, eriochrome black T) was studied. The following metals were
investigated: Al(III), Sc(III), Ga(III),
In(III), and REE(III).
The optimal conditions for the determination of different combinations of these
metals were established. The main factor determining the possibility of
simultaneous analysis is the pH of the medium, and appropriate values of pH for
the determination of different pairs of M(III) by linear sweep polarography
are proposed. Other factors, like the amount of azo
dye, were also analyzed. The polarographic methods
elaborated here were used in the analysis of alloys. The results obtained by
the polarographic method were in good agreement when
different azo dyes were used, and with the results
obtained by independent spectrophotometric methods.
The reported polarographic methods can be used for
precise and accurate simultaneous determination of two metals with similar
properties and is twice faster than known spectrophotometric
methods, which require a preliminary separation step.
Polarograms in EBSE solution with an aliquot of Ho−Zn−Al alloy (1) and with a standard solution of Ho(III) (2).
Keywords
Rare earth
elements / Alloy / Azo dye / Polarography
/ Spectrophotometry