Determination of traces of vanadium in molybdenum metal and compounds by ion exchange chromatography-spectrophotometry

Journal Article · Sat Aug 01 04:00:00 EDT 1987 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00142a004· OSTI ID:6114235

Strelow, F W.E.

Down to sub-parts-per-million concentrations of vanadium have been determined in up to 5 g of molybdenum metal or 10 g of its compounds. The vanadium has been separated by cation exchange chromatography in citric acid on 3-g AG50number-X8 resin columns, followed by spectrophotometry of the 4-(2-pyridylazo)resorcinol (PAR) complex in the presence of CDTA (cyclohexanediaminetetraacetic acid) to complex possible interfering trace elements. Separations are quite satisfactory, leaving only between 5 and 30 ..mu..g of molybdenum in the vanadium fraction when 10 g of H/sub 2/MoO/sub 4/ was present originally. Recoveries of vanadium from synthetic mixtures are quantitative, and 5-..mu..g amounts of vanadium in 10 g of H/sub 2/MoO/sub 4/ have been determined with a standard deviation of 0.05 ..mu..g. Distribution coefficients of vanadium(IV) and iron(III) in citric and citric-nitric acid mixtures as well as in mixtures containing phosphoric acid are presented together with elution curves showing that even large amounts of vanadium can be retained effectively on a 3-g column. Results for the analysis of synthetic mixtures and some actual samples are included, and the influence of the concentrations of nitric, citric, and phosphoric acid on the separation is discussed.

• Research Organization: CSIR, Pretoria, South Africa
• OSTI ID: 6114235
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 59:15; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
400105 -- Separation Procedures
CARBOXYLIC ACIDS
CATIONS
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHROMATOGRAPHY
CITRIC ACID
DATA
DISTRIBUTION FUNCTIONS
ELEMENTS
EXPERIMENTAL DATA
FUNCTIONS
HYDROGEN COMPOUNDS
HYDROXY ACIDS
INFORMATION
INORGANIC ACIDS
ION EXCHANGE CHROMATOGRAPHY
IONS
METALS
MOLYBDENUM
NITRIC ACID
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHOSPHORIC ACID
POLYMERS
QUANTITATIVE CHEMICAL ANALYSIS
RESINS
SEPARATION PROCESSES
SPECTROPHOTOMETRY
TRACE AMOUNTS
TRANSITION ELEMENTS
VANADIUM