Study of the impurity composition of isotope enriched german 70GeH4 by the method of gas chromatography-mass spectrometry

For the first time, the impurity composition of isotopically enriched germane 70GeH4 has been studied by gas chromatography-mass spectrometry. To separate impurities, we used a GS-GasPro capillary adsorption column 60 m × 0,32 mm with silica gel as a sorbent, GS-CarbonPLOT 25 m × 0,32 mm × 0,25 μm with a carbon sorbent and 25 m × 0,26 mm × 0,25 μm with sorbent polytrimethylsilylpropine. It has been shown that their use makes it possible to achieve a high resolution of the chromatographed substances. The identification of impurities was carried out by comparing their mass spectra with the data of the NIST library. Gases are found in germane, which are part of the atmosphere, C1 – C7 hydrocarbons, chlorine and oxygenated hydrocarbons, sulfur-containing substances, homologues and alkyl derivatives of germane. As a result of studying the composition of their mass spectra, the mass spectra of impurities 70GeC3H10 and 70GeC4H12, which are absent in the literature sources, were obtained and described for the first time. Concentrations of impurities in high-purity germane, as well as their distribution over fractions isolated during its rectification purification, have been determined. The detection limits of the identified substances were 2·10–7 – 1·10–4 mol. %.