【摘要】 建立了气袋采样-液氮低温浓缩-气质联用分析污染源废气中环氧氯丙烷的方法,优化了相关监测参数。优化后的方法在环氧氯丙烷质量浓度10~500μg/m~3范围内线性良好,相关系数>0.999,加标回收率为72.1%~85.7%,相对标准偏差<5%,气体进样量为5.0 mL时,检出限为4.37μg/m~3,可以满足废气中环氧氯丙烷监测的要求。更多还原

【Abstract】 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 ~ 500 μg/m~3,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. 37 μg/m~3 based on an injection volume of 5 mL,which was sensitive enough to realize waste gas monitoring.更多还原