ABSORPTIOMETRIC DETERMINATION OF NIOBIUMV WITH 4-(2)PYRIDYLAZO)-RESORCINOL AS REAGENT

Journal Article · Sun Sep 01 04:00:00 EDT 1963 · Talanta (England)

DOI:https://doi.org/10.1016/0039-9140(63)80133-2· OSTI ID:4634432

Belcher, R; Ramakrishna, T V; West, T S

4-(2-Pyridylazo)-resorcinol forms a 1; 1 purple-colored complex ( lambda /sub max/= 550 m mu ) with niobium(V) in an acetatetartrate medium as pH 5.8. This is suitable for the spectrophotometric determination of niobium down to 0.1 ppm. The color is formed within 45 min, and is stable thereafter for several days; the molecular extinction coefficient, epsilon /sub 550m mu / = 38,700, is as high as that reported for the wellknown thiocyanate procedure, and the stability is very much superior. The interference of over 40 ions was examined at the 1000- mu g level in the presence of excess of cyanide and EDTA; only uranium(VI), vanadium(V), and phosphate interfere. Vanadium may be masked by addition of zinc ions and uranium by ammonium oxalate. 1000 mu g of tartalum exhibit weak color formation with the reagent, but this can be eliminated by the addition of larger amounts of tartrate, with only a slight decrease in the sensitivity of the niobium reaction. The new procedure does not necessitate an extraction, and is easier to operate than the standard methods. (auth)

• Research Organization: Univ. of Birmingham, Eng.
• NSA Number: NSA-17-038960
• OSTI ID: 4634432
• Journal Information: Talanta (England), Journal Name: Talanta (England) Vol. Vol: 10; ISSN TLNTA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
ACETIC ACID
ACIDITY
CHEMISTRY
COLOR
CYANIDES
EDTA
INTERFERING ELEMENTS
NIOBIUM
NIOBIUM COMPLEXES
ORGANIC ACIDS
ORGANIC NITROGEN COMPOUNDS
PHENOLS
PHOSPHATES
PHOTOMETRY
QUALITATIVE ANALYSIS
QUANTITATIVE ANALYSIS
RESORCINOL
SPECTROSCOPY
STABILITY
TARTARIC ACID
URANIUM COMPOUNDS
VANADIUM COMPOUNDS