电子制冷浓缩-气相色谱-质谱法测定废气中挥发性有机物

Determination of volatile organic compounds in waste gas by electronic refrigeration concentration gas chromatography-mass spectrometry

用化学惰性优良的氟聚合物薄膜气袋采集固定污染源废气样品,经电子制冷冷冻浓缩、热解析后,进入气相色谱分离,用质谱检测器进行检测,根据保留时间、质谱图或特征离子定性,外标法定量测定废气中挥发性有机物。方法检出限为0.10nmol/mol,实验相对标准偏差范围在2.01%—7.89%,相对误差范围在0.2%—14.0%,同时具有较高的回收率。

Fluoropolymer film gas bag with excellent chemical inertia was used to collect the waste gas samples from station.ary pollution sources.After freezing concentration and thermal analysis by electronic refrigeration,the samples were sepa.rated by gas chromatography and detected by mass spectrometry detector.Volatile organic compounds(VOCs)in waste gas.es were quantitatively determined by external standard method according to retention time,mass spectra or characteristic ions.The detection limit was 0.10 nmol/mol.The relative standard deviation ranged from 2.01%to 7.89%and the relative error ranged from 0.2%to 14.0%with high recovery.