在线气相色谱-质谱联用技术在定性定量监测水中挥发性有机物的应用

Study on Application of On-line GC-MS in Determining Volatile Organic Compounds in Surface Water

通过将动态吹扫捕集气相色谱-质谱联用技术在线化,实现了全自动在线测定地表水中的54种挥发性有机物(VOCs),并能对其他VOCs进行定性半定量监测。54种VOCs的方法检出限为0.05~0.74μg/L,在0~10μg/L范围内线性良好;加标回收率为69.6%~107.2%;除1,2,4-三氯苯等5种VOCs外,其余49种VOCs的测定标准偏差均<10%。该方法检出限、线性、准确度和精密度都能满足水质自动监测的需要。

By taking purge and trap gas chromatography/mass spectrometry% P＆T-GC/MS） o n - l in e, it achieved fully automatic on-line monitoring of 54 kinds of volatile organic compounds% V 0C s） in surface water, and it can alsodetermine other unusual V0Cs. The method detection limits for 54 kinds of V0Cs were 0. 05 ？0relationship within the ccnccntration range of 0 ] 10 ! / /L . 49 kinds of V0Cs ’ standard deviations were less than 1 0% ,except for 5kinds of compounds,such as 1, 2 , ^-trichlorobenzene. The standard addition recoveries were 69 . 6% ] 107. 2% . In a l l, it can meet the need of water automatic monitoring in terms of metliod detection limit, linear relationship, accuracy and