气相色谱/质谱法测定空气中硝基苯类化合物

Detection of aromatic nitrocompounds in air by gas chromatography/mass spectrometry

目的：建立空气中硝基苯类化合物的气相色影质谱法测定方法。方法：利用硅胶采样管采集空气中气态硝基苯类化合物，二氯甲烷解析后注入气相色谱／质谱，根据其浓度在全扫描方式（Scan）或选择离子扫描方式（Sim）下用内标标准曲线法进行定量分析。结果：本方法操作简便，检测范围较宽（0．050～40μg），回收率均大于93％，相对标准偏差小于5％。结论：方法适合环境空气及工作场所空气中硝基苯类化合物的测定。

Objective：To establish a method for the determination of aromatic nitrocompounds in air by gas chromatography/ mass spectrometry. Methods：Aromatic nitrocompounds in air were absorbed by the silica gel, and then desorbed by CH2Cl2 and analyzed by GC/MS. Scan or Sim modes was selected according to the real concentration. Results：The operation was simple. The detection range was 0. 05 -40μg. Every compound recovery was higher than 93%. The relative standard deviation was less than 5%. Conclusion：The method is suitable to measure aromatic nirtocompounds in environment and workplace air.