Dicesium Plutonium Hexachloride, a Proposed Primary Standard for Plutonium.

Abstract

EXPERIMENTALReagents and Apparatus.Plutonium metal, 99.8 + % purity. Average atomic weight, 239.12. Cesium chloride, American Potash and Chemical Corp., technical grade,

Synthesis and trace metal characterization of potassium plutonium sulphate: working reference material for plutonium

“…Figure 1 depicted the scheme for the preparation of K 4 Pu(SO 4 ) 4 . Similar type of method was also reported in the literature [36,37]. The synthesis of K 4 Pu(SO 4 ) 4 can be expressed by the following equations…”

Method for Estimating Acidity Changes in Plutonium Solutions

“…Substituting these values into Eqs. (1), (2), (5), and (12) shows that they satisfy the conditions of equilibrium required by these equations. The average oxidation number of the valence state distributions is 4.0 as required by the condition of "pure tetravalent plutonium" as starting material, and the sum of the fractional parts of all oxidation states is unity.…”

“…Then the terms "HF" and "HO" may be interpreted as the final and original hydrogen ion concentrations of the plutonium solution. Equation (5) states that, if a tenth molar plutonium solution equilibrates in such a manner that at equilibrium there are 10°/o more of the species Pu(V) and Pu(VI) taken If the effects of ionic strength may be neglected, then all terms in Eq. (6) except "M" are constants characterized by the initial and final solution conditions.…”

“…For ease, let the hydrolysis of all plutonium cations be neglected. Suppose that one mole of pure tetra valent plutonium (as Cs 2 PuCl e , for example [5]) were introduced into a liter of water (initial acidity, HO, is 10 -7 M). In this imagined circumstance, [Pu(V) + Pu(VI)]i is zero, and terms referencing PuOH 3+ may be neglected.…”

Plutonium and Plutonium Compounds

“…The trichloride is an emerald-green solid and can be prepared from the reaction of Pu metal or PuO 2 with HCl gas at elevated temperatures, and can be purified by sublimation and zone melting. The yellow complex chloride, Cs 2 PuCl 6 , is stoichiometric, stable, and can be used as a primary analytical standard for plutonium (122).…”