University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Inorganic compound

Citations 1

"Determination Of Trace Amounts Of Thorium In Aluminum Nitride By Fluorimetric FIA Using Flavonol"
Bunseki Kagaku 1992 Volume 41, Issue 1 Pages 1-4
Mikasa, H.;Hori, Y.

Abstract: Sample was dissolved by heating with 9 M H2SO4 in a sealed PTFE vessel. The aqueous phase was adjusted to pH 1.0±0.2 and Th was extracted into thenoyltrifluoroacetone in benzene and back-extracted into 3 M HCl. The Th(IV) was treated with flavonol containing 0.1% β-cyclodextrin in a flow injection system in which the fluorescence was measured at 462 nm (excitation at 394 nm). The calibration graph was rectilinear for up to 30 ng mL-1 of Th and the detection limit was 3 ng mL-1. The sampling rate was 20 h-1. Interference was minimal; down to 24 ng g-1 of Th was determined in aluminum nitride. Flow injection analysis (FIA) and sample decomposition methods were examined for the determination of trace amounts of Th in Al nitride. High recovery of Th was obtained in dissolution of Al nitride in hot 9 M H2SO4 under pressure and Th was extd. with thenoyltrifluoroacetone in PhH from an acidic aqueous solution and back-extd. into 3 M HCl. A fluorescent complex was formed between flavanol and the Th (IV) ion and the fluorescence was detected in the FIA. A linearity was obtained in calibration curve at diluted condition by addition of β-cyclodextrin. The detection limit of Th was 3 ng/mL and the sample throughput was 20h-1. Trace Th (24 ng/g) in Al nitride was determined.
Thorium-232 Sample preparation Fluorescence Interferences Complexation