PART I. EXTRACTION OF URANIUM, THORIUM, HAFNIUM AND THE ALKALINE EARTH ELEMENTS WITH BIS(DI-n-HEXYLPHOSPHINYL) METHANE FROM PERCHLORIC ACID SOLUTIONS. PART II. SIMULTANEOUS SPECTROPHOTOMETRICDETERMINATION OF TRACE AMOUNTS OF CALCIUM AND MAGNESIUM WITH CHLOROPHOSPHONAZO III

Technical Report · Fri Nov 01 04:00:00 EST 1963

OSTI ID:4070814

Ferguson, J W; Banks, C

The extraction of hafnium, thorium, uranium, magnesium, calcium, barium, and strontium with HDPM in 1,2-dichlorobenzene from perchloric acid solutions in a three to one molar ratio of HDPM to metal ion was studied. Most of the hafnium formed a precipitate between the phases. Thorium was nearly quantitatively extracted from all concentrations of perchloric acid. Uranium was quantitatively extracted from all concentrations of perchloric acid. The alkaline earth elements were not well extracted from any concentration of perchloric acid. The extraction of calcium was increased by using sodium perchlorate solutions rather than perchloric acid solutions. A rapid and sensitive spectrophotometric procedure for determining calcium and magnesium with Chlorophosphonazo III is described. Either calcium or magnesium may be determined at pH 7.0 in the range of 0.1 mu g per 25 ml (0.004 ppm) to 10 mu g per 25 ml (0.4 ppm). In mixtures of calcium and magnesium, calcium is determined at pH 2.2 at a wave length of 667.5 m mu . The magnesium is then determined by difference at pH 7.0 and 669 m mu where the absorbances of the two metal complexes are additive. Milligram amounts of the alkali metals can be tolerated, but most other metals interfere. (auth)

• Research Organization: Ames Lab., Ames, Iowa
• DOE Contract Number: W-7405-ENG-82
• NSA Number: NSA-18-009970
• OSTI ID: 4070814
• Report Number(s): IS-777
• Country of Publication: United States
• Language: English

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CHEMISTRY