Gas Chromatographic Characteristics of Polytrifluoro- monochloroethylene Columns as applied to Analysis of Uranium Hexafluoride and other Volatile Inorganic Fluorides

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A gas chromatographic assembly for analyzing UF6 and other volatile inorganic fluorides was constructed. Column packings were consisted of polytrifluoronaonochloroethylene oil as partition liquid, and moulding powder as supporting solid, both substances being inert to UF6 if the operation temper-ature is not too high. Through examination of the curves for peak height ratio between elution and inlet, it was found that, to obtain reproducible results, it was necessary to pretreat the columns by fluorine, use purified carrier gas, and establish a definite time schedule for sample introduction. Dependence of HETP on (1) flow rate of carrier gas, (2) operation temperature, (3) degree of polymerization of polytrifluoromonochloroethylene oils, and (4) liquid phase loading were studied, and conditions for obtaining small HETP are discussed. Gas chromatography of TeF6 and MoF6 were studied, and the possibility of separating these gases from UF6 has been demonstrated.