Standard methods for chemical analysis of reactor and commercial niobium

Journal Article · Wed Jan 01 04:00:00 EST 1975 · Annu. Book ASTM Stand.; (United States)

OSTI ID:7353119

Photometric methods are described for the determination of N, Mo, W, and Fe in Nb. The limits of the concentration ranges for 15 other impurities in the Nb are specified. N is determined in concentrations from 20 to 1000 ppM by separation as NH/sub 3/ by steam distillation followed by development of the yellow color with Nessler reagent for measurement at 430 nm. Mo and W are determined in concentrations from 50 to 1000 ppM. The Mo-dithiol complex is extracted with CCl/sub 4/ from a H/sub 2/SO/sub 4/ solution for measurement at 680 nm. W is measured as the dithiol complex at 640 nm in a CCl/sub 4/ medium after reduction of the W with TiSO/sub 4/. Concentrations of Fe in the range from 150 to 1000 ppM are measured as the orange-red complex with 1,10-phenanthroline at 508 nm. (BLM)

• OSTI ID: 7353119
• Journal Information: Annu. Book ASTM Stand.; (United States), Journal Name: Annu. Book ASTM Stand.; (United States) Vol. 45; ISSN ASTSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
CARBON TETRACHLORIDE
CHEMICAL ANALYSIS
CHLORINATED ALIPHATIC HYDROCARBONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
IMPURITIES
IRON
METALS
MOLYBDENUM
NIOBIUM
NITROGEN
NONMETALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHENANTHROLINES
REFRACTORY METALS
SENSITIVITY
SPECTROPHOTOMETRY
TRANSITION ELEMENTS
TUNGSTEN