Metal chelate fluorescence enhancement in micellar media and its applications to niobium and tantalum ultratrace determinations

Conference · Mon Jul 01 04:00:00 EDT 1985 · Anal. Chem.; (United States)

OSTI ID:5488724

Sanz-Medel, A; Alonso, J I.G.; Gonzalez, E B

The fluorescence intensities of niobium and tantalum complexes with several fluorimetric organic reagents enhanced by micellar solutions have been examined. Flavone derivatives (morin and quercetin) produced the more intense fluorescing reactions in a cationic micellar medium and are studied in detail. Effects upon fluorescence of the nature of the tensoactive material used have been investigated. The charge of the micelle, presence of homomicelles in solution, and chemical structure of the cationic surfactant and lumophoric reagent proved to be the decisive factors which influence enhancement of fluorescence of a metal chelate by a surfactant. The dramatic effects of the appropriate organizing medium and of sulfate ions on fluorescence of the Nb(V) and Ta(V) complexes with morin and quercetin are discussed in an effort to elucidate what trends may exist in the fluorescence enhancement of metal chelates by micelles. A general reaction mechanism, for those systems studied, is proposed. Analytical applications of such micelle-enhanced reactions to the fluorimetric determination of ultratraces of Nb(V) and Ta(V) are also shown. 24 references, 10 figures, 3 tables.

• Research Organization: Univ. of Oviedo, Spain
• OSTI ID: 5488724
• Report Number(s): CONF-8408162-
• Conference Information: Journal Name: Anal. Chem.; (United States) Journal Volume: 57:8
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
AROMATICS
CHELATES
CHELATING AGENTS
CHEMICAL ANALYSIS
CHEMICAL REACTION KINETICS
COMPLEXES
DATA
DISPERSIONS
DYES
ELEMENTS
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
FLAVENOIDS
FLAVONES
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
KINETICS
LUMINESCENCE
METALS
MICELLAR SYSTEMS
MIXTURES
MORIN
NIOBIUM
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHENOLS
POLYPHENOLS
PYRANS
QUANTITATIVE CHEMICAL ANALYSIS
QUERCETIN
REACTION KINETICS
REAGENTS
SOLUTIONS
SPECTROSCOPY
SURFACTANTS
TANTALUM
TRACE AMOUNTS
TRANSITION ELEMENTS