|关键词: 低温浓缩 气质联用 环氧氯丙烷
|Determination of Epichlorohydrin Emissions from Stationary Sources Using Cryogenic Pre concentration Followed by GC/MS
ONG Xiaojuan， LI Haiyan， YIN Mingming， MA Yuqin
Lianyungang Environmental Monitoring Center， Lianyungang，Jiangsu 222001， China
|A method based on cryogenic pre concentration followed by GC/MS was established for the determination of epichlorohydrin emissions from stationary sources. A cryogenic pre concentrator， which acts as autosampler， was used to concentrate epichlorohydrin collected in gas bags. Relevant parameters for cryogenic pre concentration were optimized. After pre concentrated， epichlorohydrin was introduced into GC/MS to undergo qualitative and quantitative analysis， and appraisal of the whole method was then carried out from different respects. Good linearity was obtained within 10~500μg/m3， and the correlation coefficient was greater than 0.999. The average recoveries ranged from 72.1%~85.7%. Meanwhile， the method was stable enough to realize extensive use with RSD lower than 5%. The detection limit was 4.37μg/m3 based on an injection volume of 5 mL， which was sensitive enough to realize waste gas monitoring.
|Key words: Cryogenic pre concentration GC/MS Epichorohydrin