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Download PDF by Alfred J. Moses: Analytical Chemistry of the Actinide Elements

By Alfred J. Moses

ISBN-10: 0080099157

ISBN-13: 9780080099156

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HC1, F - cat. 5 min 1min 20 20 20 * Aeration may be necessary to oxidize U +3 to U +4 . 24 — — — SEPARATIONS 25 Because of large differences in extraction coefficients between the actinides, it is not feasible to extract them as a group. A similar situation exists with ion exchange separations. 2 U N I T PROCESSES FOR THE SEPARATION OF ACTINIDES Step Procedure Separation of Extraction hexavalent actinides Precipitation ( 1 ) 0 · 5 Μ Η Ν 0 3 , 2 M Mg(N0 3 ) 2 , ethyl ether ( 2 ) 0 · 1 Μ H N 0 3 , 3 M Ca(N0 3 ) 2 , hexone (3)pH 1-5, 3 M acetylacetone in hexone (1) 1 M C H 3 C 0 2 H , 0-5 M CH 3 C0 2 Na, 5 M N a N 0 3 , U + e carrier Joint separa- Extraction tion of tetraand hexavalent actinides Precipitation (1)8M (2) 1 M (3) pH (4) 2 M (1) pH H N 0 3 , ethyl ether H N 0 3 , 4 M Ca(N0 3 ) 2 , hexone ~ 4, 3 M acetylacetone in chloroform H N 0 3 , tributyl phosphate ~ 1, excess H 2 O a Separation of Extraction tetravalent actinides ( l ) p H 1-0, 1*5M cupferron in chloroform (2)pH 1-0, 0-1 M T T A in benzene (3)pH 2 0 , 2 M acetylacetone in benzene (only U and Pu) Precipitation ( 1 ) 0 · 2 Μ I03~, 3 M H + , Ce + 4 or Zr+ 4 carrier ( 2 ) 0 · 3 Μ H 3 P 0 4 , 3 M H+, Zr+ 4 or Bi+3 carrier (3) m-nitrobenzoic acid, p H ~ 3, T h + 4 carrier Joint separa- Precipitation (1) 1-3 M H F , 1 M H+, La+ 3 carrier tion of tri( 2 ) 0 1 M H 2 C 2 0 4 , I M H+, Ce+4 or Th+ 4 and tetracarrier valent Ion (1) Sorption on cation exchange resin, eluactinides Exchange tion with complexing agent Separation of No satisfactory process for the selective separation of trivalent trivalent actinides actinides 26 THE ACTINIDE ELEMENTS oxidation states of 4, 5 and 6.

REFERENCES 1. Handbook of Chemical Methods for the Determination of Uranium in Minerals and Ores, H . M . Stationery Office, London, 1950. 2. C. J. RODDEN and J. J. TREGONING, Manual of Analytical Methods for the Determination of Uranium and Thorium in their Ores, revised edition, New Brunswick Laboratory, U . S . Government Printing Office, Washington, 1955. 3. F . S. GRIMALDI, I. M A Y , M . H . FLETCHER and J. S. Geo. Surv. Bull. No. 1006, Washington, 1954. 4. W. F . HILLEBRAND and G. E. F .

EMULSION TECHNIQUES Very low levels of alpha activity can be determined by exposure of the separated material to a nuclear track emulsion. This technique is particularly useful in health physics analyses, where urine specimens must be analyzed for rather low levels of plutonium and other elements. Following is an outline of the analytical method, recommended by Schwendiman and Healy13 for the determination of plutonium in urine. Procedure for the determination ofplutonium in urine. Coprecipitate Pu on L a F 3 and dissolve the precipitate.

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Analytical Chemistry of the Actinide Elements by Alfred J. Moses


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