By Alfred J. Moses
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Dilute to 20ml, add 1 ml of 1 % KCN solution and adjust to pH 10 by addition of NH 4 OH. Add 2 ml of 0 1 % PAN solution (01 g of PAN dissolved in 100 ml of methanol) to the sample solution and allow to stand 10 min. Then add 10-0 ml of o-dichlorobenzene, shake for 5 min and centrifuge. Fill the spectrophotometer cell with extract (heavy layer) and read absorbance against a reagent blank at 570 πιμ. Note: According to Shibata,6 little or no interference was encountered by the addition of milligram amounts of Ag, As, (AI), Ce, Cd, Ca, Cu+8, Fe+S, Ga, Hg+a, Mn+2, Mo, Ni, Zn, Pb, Mg, In, Th, V and W.
4. , Richmond, California) source, whose 60 keV gamma-rays were partially absorbed by uranium or plutonium-containing solutions. The transmission of radiation was measured by a gamma scintillation counter. An ionization chamber was used by Broderick and Whitmer 16 » 17 to measure the gamma radiation from an Am 241 source, which was transmitted through aqueous and organic solutions containing uranium. A typical absorption cell has a solution depth of 4-1 cm and contains a uranium concentration of 30 mg/ml.
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 . , John Wiley, New York, 1953. 5. C. J. RODDEN and J. C. ), Analytical Chemistry of the Manhattan Project, McGraw-Hill, New York, 1950.
Analytical Chemistry of the Actinide Elements by Alfred J. Moses