Abstract
A procedure is proposed for the cryogenic preconcentration of hydrogen, argon, oxygen, and nitrogen in the gas chromatographic determination of their impurities in volatile inorganic hydrides. It is shown that the recovery of impurity gases approaches 100%. The limits of determination of impurity gases in hydrides with the use of the proposed procedure and a helium ionization detector are 2 × 10–6–3 × 10–5mol %, which is 5–100 times lower than the results published previously. The results are given for the determination of hydrogen, argon, oxygen, and nitrogen in silane, germane, arsine, phosphine, hydrogen sulfide, hydrogen selenide, and ammonia samples.
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