By Alfred J. Moses
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Additional resources for Analytical Chemistry of the Actinide Elements
1 However, measurement in nitric acid medium at a single wavelength is unsatisfactory owing to the strong dependence of the spectrum on nitrate concentration. 2 The determination of uranium in hydrochloric acid solution has been reported by Callahan,3 who measured the absorbance of a chloride complex at 246 m/x and observed adherence to Beer's law in the range of 1-60 ppm. Because many materials absorb in acid solution around 246 m/z,4 a prior separation by solvent extraction is recommended. A procedure for the solvent extraction of uranium into ethyl acetate is given in Chapter IX under " Fluorimetry ".
2 is based on their observations, the author's experience in the analysis of neutronirradiated materials, and reports by a number of workers in this field. The chemist is cautioned about the following hazards: (1) pyrophoricity of finely divided U, T h and Pu metals; (2) danger of explosion when zirconium is treated with nitric acid in the absence of fluoride; (3) possible violent reaction between U and perchloric acid; (4) radioactivity, criticality and other hazards, described in Chapter I. Q U A L I T A T I V E ANALYSIS OF A C T I N I D E S Actinides are not members of the usual schemes for the qualitative analysis of the elements.
Peroxides of Pu+4, Th+4, Ce+4, Zr+4, Np+4 and Pa+5 can be precipitated from slightly acid solution by addition of hydrogen peroxide. 3 provides information concerning the coprecipitation of actinides on various carriers. It is to be noted that by adjustment of the oxidation state of an element, it can frequently be coprecipitated. S E P A R A T I O N BY E L E C T R O L Y S I S The following elements can be separated by the mercury cathode from sulfuric acid or perchloric acid solution2»3: Ag, As, Au, Bi, Cd, Co, Cr, Cu, Fe, Ga, Ge, Hg, In, Ir, Mo, Ni, Os, Pb, Pd, Po, Pt, Re, Rh, Se, Sn, Tl and Zn.