Abstract
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.
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