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

Abstract

A gas chromatographic assembly for analyzing UF 6 and other volatile inorganic fluorides was constructed, Column packings were consisted of polytrifluoromonochloroethylene oil as partition liquid, and moulding powder as supporting solid, both substances being inert to UF 6 if the operation temperature is not too high.Through examination of the curves for peak height ratio between elution and inlet, it was found that, to obtain raproducible 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 (l) 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 TeF, and MoF 6 were studied, and the possibility of separating these gases from UF 6 has been demonstrated.

Highly fluorinated polymers with sulfonate, sulfamide and N,N‐diethylamino groups for the capillary electromigration separation of proteins and steroid hormones

“…Nowadays, application of HiFP in chromatographic separation methods is commonly limited to the preparation of thermally and chemically stable stationary phases designed for the separation of highly reactive (UF 6 or interhalogens ) compounds and hydrocarbon compounds from fluorinated ones. An attempt of using such fluoropolymers as dynamic modifiers of BGE or fused‐silica capillary walls in CE separations for a rapid variation of surface characteristics would not lead to any success.…”