Gas-Chromatographic Determination of C1-C4 Hydrocarbon Trace Impurities in Silicon Tetrafluoride

A procedure was developed for the gas-chromatographic determination of hydrocarbons in silicon tetrafluoride of natural and isotopically enriched compositions. For improving the efficiency of the chromatographic determination of impurities, it was proposed that the major compound be removed from the test sample with the subsequent cryofocusing of impurity hydrocarbons. The detection limits of C1-C4 hydrocarbons were 2 × 10−6−6 × 10−6 vol %.