Хроматомасс‑спектрометрическая идентификация примесей в изотопно‑обогащенном силане

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Хроматомасс-спектрометрическое определение примесей

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Хроматомасс-спектрометрическая идентификация примесей

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Impurities in high-purity carbon tetrachloride were identifi  ed by gas chromatography/ mass spectrometry.  The identifi  cation was accomplished by comparison of experimental mass spectra with the spectra in  NIST-2005 database. For concentrations, close to the limit of detection, the nature of impurities was  determined using selective ion monitoring and retention times of the corresponding substances. For the  fi  rst time sulfur, 2 bromochloromethanes, hexachlorocyclopropane, saturated hydrocarbons C6–C18 and  some aromatic impurities were identifi  ed. Totally 41 impurity substances were found.

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Анализ фармацевтических субстанций

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