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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Classification: Geological -> ore -> pitchblende

Citations 1

"Diode-array Detectors In Flow Injection Analysis. Simultaneous Determination Of Rare Earth Metals With Arsenazo III"
Fresenius J. Anal. Chem. 1990 Volume 338, Issue 7 Pages 831-835
M. Blanco, J. Coello, J. Gené, H. Iturriaga and S. Maspoch

Abstract: Ore (1 g) was treated with 20 mL of concentrated HNO3 and heated to dryness. The residue was treated with 20 mL of concentrated HCl and heated to dryness. The residue was resuspended in 0.1 M HCl, filtered, washed and the filtrate was diluted to 100 mL with 0.1 M HCl. A 25 mL aliquot was treated with 0.1 M NH3 and the ppt. was filtered off, washed and dissolved in 0.1 M HCl. The solution was mixed with 10 mL of tartaric acid and diluted to 100 mL with 0.1 M HCl. A portion of this solution was injected into a carrier stream of 1 M acetic acid - sodium acetate buffer (pH 4; 1.2 mL min-1), mixed with a reagent stream containing 0.3 mM arsenazo III and the absorbance of the solution was measured between 600 and 720 nm with use of a diode array detector. Binary mixtures of 0.5 to 2.5 µg g-1 of tervalent rare-earth-metal cations and 1.4 to 4.3 µg g-1 of U were accurately resolved with use of univariate calibration. The presence of Th (2.8 to 7.0 µg g-1) required use of multivariate calibration. Results obtained for the determination of Th and U in pitchblende agreed well with the certified values.
Metals, rare earth Uranium Thorium-232 Spectrophotometry Buffer Reference material Multivariate calibration Interferences