Spectrophotometric Determination of Tantalum in Iron, Steel, and Niobium Metal

Journal Article · Tue May 01 04:00:00 EDT 1962 · Analytical Chemistry

DOI:https://doi.org/10.1021/ac60186a009· OSTI ID:4782427

Kakita, Yachiyo; Goto, Hidehiro

A procedure for the determination of small amounts of tantalum in iron, steel, and niobium metal is described. Tantalum forms a complex salt with malachite green in the presence of hydrofluoric acid, and this salt is extracted with benzene or xylene. Usually boron is the only element present in the sample which undergoes a color reaction similar to that of tantalum, and it can be removed easily by fuming with sulfuric acid to volatilize it as boron trifluoride. After dissolution of the sample with sulfuric acid, the solution is diluted with ammonium oxalate solution. Hydrofluoric acid is added to a part of this solution, the sulfuric acid concentration is adjusted to about 0.1N with sodium hydroxide, and malachite green is added. The complex salt is extracted with benzene, and tantalum is determined by measuremunt of the absorbance of the benzene layer at 635 M mu . From 0.005 to 0.5% of tantalum can be determined with good accuracy without any preliminary separation of tantalum. This method should also be applicable to a somewhat wider range (from 0.001 to 5%) of tantalum.

• Research Organization: Tohoku Univ., Sendai
• Sponsoring Organization: USDOE
• NSA Number: NSA-16-016313
• OSTI ID: 4782427
• Journal Information: Analytical Chemistry, Journal Name: Analytical Chemistry Journal Issue: 6 Vol. 34; ISSN 0003-2700
• Publisher: American Chemical Society (ACS)
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
AMMONIUM COMPOUNDS
BENZENE
BORON
BORON FLUORIDES
CHEMISTRY
COPPER CARBONATES
EVAPORATION
HYDROFLUORIC ACID
IMPURITIES
IRON
MALACHITE
MINERALS
NIOBIUM
OXALATES
PHOTOMETRY
QUANTITATIVE ANALYSIS
SODIUM HYDROXIDES
SOLUTIONS
SOLVENT EXTRACTION
SPECTROSCOPY
STEELS
SULFURIC ACID
TANTALUM
TANTALUM COMPLEXES
TRACE AMOUNTS
XYLENE