Spectrophotometric determination of zirconium and hafnium with 4-(2-pyridylazo)resorcinol

Journal Article · Thu Dec 01 04:00:00 EST 1983 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00264a010· OSTI ID:6857603

Kalyanaraman, S; Fukasawa, T

Reaction behavior of zirconium and hafnium with 4-(2-pyridylazo)resorcinol is established under various conditions. Optimum conditions for a very sensitive spectrophotometric procedure are outlined for the determination of zirconium and hafnium. Zirconium and hafnium react quantitatively with the reagent in alkaline pH from 8 to 9.2 and 8 to 9.8, respectively, to form 1:2 water-soluble complexes. The molar absorptivity for zirconium and hafnium is 66,000 and 77,400, respectively. The order of addition of the reagent, metal ion, and buffer solution is evaluated. It is concluded that both zirconium and hafnium solutions must be maintained at higher acidities to react quantitatively with the reagent. A number of foreign ions are tested for their interference and the use of masking agents and selective extractive agents is outlined. The relative standard deviations are +/-0.5% and +/-0.7 for the determination of 30 ..mu..g of zirconium and 40 ..mu..g of hafnium, respectively. 3 figures, 3 tables.

• Research Organization: Yamanashi Univ., Kofu, Japan
• OSTI ID: 6857603
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 55:14; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
ABSORPTION SPECTRA
ALKALI METAL COMPOUNDS
AQUEOUS SOLUTIONS
AROMATICS
AZINES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COMPLEXES
DATA
DIAZO COMPOUNDS
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
HAFNIUM
HAFNIUM COMPLEXES
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
INFORMATION
INORGANIC ACIDS
INTERFERING ELEMENTS
METALS
MIXTURES
NITRIC ACID
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
PHENOLS
POLYPHENOLS
PYRIDINES
PYRIDYLAZORESORCINOL
QUANTITATIVE CHEMICAL ANALYSIS
REAGENTS
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SOLUTIONS
SPECTRA
TRACE AMOUNTS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
ZIRCONIUM
ZIRCONIUM COMPLEXES