Determination of traces of titanium down to sub-part-per-million levels in molybdenum metal and compounds by ion exchange chromatography/spectrophotometry

Journal Article · Wed Oct 01 04:00:00 EDT 1986 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00125a012· OSTI ID:5345808

Strelow, F W.E.

Traces and up to 10 mg of titanium can be determined in large samples of molybdenum or molybdenum compounds (up to 10 g) by cation exchange chromatography with columns containing only 2 or 4 g of AG50W-X4 resin followed by determination using spectrophotometry of the Tiron complex in the presence of complexing agents. Separations are very satisfactory, leaving only between 5 and 30 /sup +/g of molybdenum in the titanium fraction when 10 g of MoO/sub 3/ is present originally. Recoveries of titanium from synthetic mixtures are quantitative and 5 ..mu..g of titanium (0.5 ppm) in 10 g of MoO/sub 3/ can be determined with a standard deviation of 0.2 ..mu..g (0.02 ppm). Relevant elution curves and results for the analysis of synthetic mixtures and some actual samples are presented and the influences of nitric and phosphoric acid concentrations on the separation are discussed. In addition a method is presented to avoid excessive catalytic decomposition of H/sub 2/O/sub 2/, which can interfere with the column separation.

• Research Organization: CSIR, Pretoria, South Africa
• OSTI ID: 5345808
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 58:12; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
400104 -- Spectral Procedures-- (-1987)
CATIONS
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHROMATOGRAPHY
DATA
ELEMENTS
ELUTRIATION
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
ION EXCHANGE CHROMATOGRAPHY
IONS
METALS
MOLYBDENUM COMPOUNDS
NITRIC ACID
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC POLYMERS
PETROCHEMICALS
PETROLEUM PRODUCTS
PHOSPHORIC ACID
POLYMERS
QUANTITATIVE CHEMICAL ANALYSIS
REFRACTORY METAL COMPOUNDS
RESINS
SEPARATION PROCESSES
SPECTROPHOTOMETRY
TITANIUM
TRACE AMOUNTS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS