Micelle-stabilized room-temperature liquid phosphorimetry of metal chelates and its application to niobium determination

Journal Article · Sat Feb 28 23:00:00 EST 1987 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00132a020· OSTI ID:6971771

Sanz-Medel,; A,; Garcia, P L.M.; Garcia, M E.D.

A detailed examination of 8-hydroxyquinoline and some of its derivatives as potential complexing reagents for the room-temperature phosphorescence determination of Nb(V) in micelles of different charge-type surfactants has been conducted. Enhanced fluorescence was observed in most cases. To observe analytical room-temperature phosphorescence (RTP), however, several essential requirements were identified: (1) charged micelles allowing electrostatic interaction with the oppositely charged binary complex have to be present, (2) external heavy atoms, ideally bromoform, should be added, (3) oxygen has to be expelled out of micelles, which is accomplished by Na/sub 2/SO/sub 3/ addition. Experimental conditions, including sunlight exposure, are optimized for the formation of the phosphorescent complex niobium(V)-ferron in micelles of cetyltrimethylammonium bromide. Two complexes of metal-ferron with stoichiometries of 1:1 and 1:3 are formed. The last complex constitutes the basis of a RTP method for the determination of Nb (detection limit, 4 ppb; +/-2% relative standard deviation at 500 ppb of Nb level). Therefore, the first example of the determination of a metal ion by micelle-stabilized RTP is reported along with an insight into possible mechanisms of these micellar reactions.

• Research Organization: Univ. of Oviedo, Spain
• OSTI ID: 6971771
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 59:5; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
ALKALI METAL COMPOUNDS
AROMATICS
AZAARENES
AZINES
BROMINATED ALIPHATIC HYDROCARBONS
BROMOFORM
CHELATES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COMPLEXES
DATA
ELEMENTS
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
FERRON
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
HALOGENATED ALIPHATIC HYDROCARBONS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
INFORMATION
LUMINESCENCE
MEDIUM TEMPERATURE
METALS
MICELLAR SYSTEMS
NIOBIUM
NIOBIUM COMPLEXES
NONMETALS
NUMERICAL DATA
ORGANIC ACIDS
ORGANIC BROMINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN
OXYGEN COMPOUNDS
PHOSPHORESCENCE
PYRIDINES
QUANTITATIVE CHEMICAL ANALYSIS
QUINOLINES
REAGENTS
SODIUM COMPOUNDS
SODIUM SULFATES
SPECTROSCOPY
SULFATES
SULFONIC ACIDS
SULFUR COMPOUNDS
SURFACTANTS
TRACE AMOUNTS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS