Ultraviolet Spectrophotometric Determination of Uranium

Ultraviolet Spectrophotometric Determination of Uranium
Author: Arno H. A. Heyn
Publisher:
Total Pages: 26
Release: 1959
Genre: Extraction (Chemistry)
ISBN:

An ultraviolet spectrophotometric method for the determination of uranium has been developed which is based on the ultraviolet absorption of the complex of uranium(VI) with tris-(2-ethylhexyl)phosphine oxide. The complex is formed by extracting uranium(VI) from an aqueous 6M sodium nitrate solution in the pH range 2.5-3.0 into 0.1M solution of tris-(2-ethylhexyl)phosphine oxide (TEHPO) in an inert diluent, cyclohexane.

Quantitative Separation of Small Amounts of Rare Earths from Thorium, Uranium, and Zirconium by Ion Exchange

Quantitative Separation of Small Amounts of Rare Earths from Thorium, Uranium, and Zirconium by Ion Exchange
Author:
Publisher:
Total Pages:
Release: 1956
Genre:
ISBN:

A successful method has been developed for the determination of certain rare earths in thorium in the fractional ppm range. The procedure is based on the ionexchange chromatographic separation of the rare earths plus added yttrium carrier from the thorium, followed by emission spectrometric determination of the rare-earth impurities in the yttrium carrier. A simultaneous separation from the rare earths of the common element impurities present in the thorium has been accomplished. A nigh degree of compensation for procedural errors is achieved by the use of a pure rare earth as both the carrier in the separation and purification procedure and the matrix material in the spectrographic determination. The method fulfills the requirements of accuracy, sensitivity, and speed necessary for use in the routine analysis of reactor-grade thorium metal. It can find application, in its present form, also for the simultaneous determination of part-per-billion amounts of common element impurities in thorium. (auth).

The Quantitative Ion Exchange Separation of Uranium from Impurities

The Quantitative Ion Exchange Separation of Uranium from Impurities
Author: Usha Narayanan
Publisher:
Total Pages: 65
Release: 1995
Genre:
ISBN:

Two methods were tested for the quantitative separation of uranium from elemental impurities using commercially available resins. The sorption and elution behavior of uranium and the separation of it from a variety of other elements was studied. The first method utilized an anion exchange resin while the second method employed an extraction resin. The first method, the anion exchange of uranium (VI) in an acid chloride medium, was optimized and statistically tested for quantitative recovery of uranium. This procedure involve adsorption of uranium onto Bio-Rad AG 1X8 or MP-1 ion exchange resins in 8 M HCl, separation of uncomplexed or weakly complexed matrix ions with an 8 M HCl wash, and subsequent elution of uranium with 1 M HCl. Matrix ions more strongly adsorbed than uranium were left on the resin. Uranium recoveries with this procedure averaged greater than 99.9% with a standard deviation of 0.1%. In the second method, recovery of uranium on the extraction resin did not meet the criteria of this study and further examination was terminated.