Investigation on deep oxidation products of UDMH by gas chromatography-mass spectrometry

1,1-dimethylhydrazine, unsymmetrical dimethyl hydrazine (UDMH) is one of the compounds to be utilized owing to the liquidation of strategic weapons. Unsymmetrical dimethyl hydrazine can be easily oxidized, so the oxidation products of dimethyl hydrazine during tank storage should be concerned. A gas chromatography - mass spectrometric method for determination of oxidation derivatives of unsymmetrical dimethyl hydrazine has been developed. The method is based on the separation of gas chromatography and structure analysis by mass spectrometry. The research results showed that the oxidation sample contains many species oxidation products when dimethyl hydrazine in air or oxygen for a long times. Ten species oxidation structures were identified. The content of the middle product dimethyl amine was decreased and of N-nitrosodimethyl amine were increased quickly, while forming new oxidation substances in the further process.