Photometric determination of tantalum (1,0–5,0 wt. %) in refractory niobium alloys with a reagent pyrogallol

Titov V.I.
UDC
620.179
DOI
10.18577/2307-6046-2017-0-1-9-9
Article PDF (Russian) (469.73 KB)
How to cite
Titov V.I. Photometric determination of tantalum (1,0–5,0 wt. %) in refractory niobium alloys with a reagent pyrogallol // Proceedings of VIAM. 2017. No. 1. DOI: 10.18577/2307-6046-2017-0-1-9-9. URL: https://test.viam.ru/en/journal/2017/1/9
Keywords
niobium alloys, tantalum, pyrogallol, methodology.
Abstract

This paper presents researches on the development of a methodology of defining tantalum in refractory niobium alloys with a reagent pyrogallol. The publications on the subject from various sources are analyzed. Upon summary review of the data and performed work it has been revealed that determination of tantalum with pyrogallol in refractory niobium alloys is possible in the presence of matrix as niobium and alloying chemical elements (zirconium, hafnium, titanium). Only alloying molybdenum also forms a colored complex, the absorbance of which is proportional to the concentration of molybdenum. In order to mitigate molybdenum content interfering determination of tantalum content a curve for the determination of tantalum is constructed taking into account the influence of molybdenum. To prevent oxidation of pyrogallol by atmospheric oxygen (whereby it becomes dark) the color reaction is carried out in reducing medium. Thus, the developed method allows direct photometric determinatio

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