SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION OF NIOBIUM AND TUNGSTEN. APPLICATION TO COMPLEX ALLOY AND STAINLESS STEELS

Journal Article · Sat Aug 01 00:00:00 EDT 1959 · Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed.

DOI:https://doi.org/10.1021/ac60152a018· OSTI ID:4240991

McDuffie, B; Bandi, W R; Melnick, L M

A thiocyanate method has been developed for the siniultaneous spectrophotometric determination of niobium and tungsten. After preliminary reduction of tungsten(VI) to tungsten(V) by stanuious chloride in hydrochloric acid solution, the total absorbance of the niobium(V) and tungsten(V) thiocyanates is measured at 400 m mu in a 0.30M thiocyanate, 20 volume% acetone medium. Oxalate is added to bleach the niobium color, and the absorbance due to tungsten alone is then meas ured. The difference in absorbances gives the niobium concentration. The method is applicable in the presence of tantalum, titanium, and molybdenum, elements which may be found with niobium and tungsten in the mixed oxide precipitate from the acid-hydrolysis treatment of steel and alloy samples. The method has been tested with various National Bureau of Standards stainless steels and cobalt-base alloys. (auth)

• Research Organization: U.S. Steel Corp., Monroeville, Penna.
• Sponsoring Organization: USDOE
• NSA Number: NSA-13-016806
• OSTI ID: 4240991
• Journal Information: Analytical Chemistry (U.S.) Formerly Ind. Eng. Chem., Anal. Ed., Vol. Vol: 31; Other Information: Orig. Receipt Date: 31-DEC-59
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CHEMISTRY
ABSORPTION
ACETONE
ACIDITY
ALLOYS
CHEMICAL REACTIONS
COBALT ALLOYS
COLOR
CYANATES
HYDROCHLORIC ACID
HYDROLYSIS
MEASURED VALUES
MOLYBDENUM
NIOBIUM
OXALATES
OXIDES
PHOTOMETRY
PRECIPITATION
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
REDUCTION
SPECTROSCOPY
STAINLESS STEELS
SULFUR COMPOUNDS
TANTALUM
TESTING
TIN CHLORIDES
TITANIUM
TUNGSTEN
USES