科研之友
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摘要
A method was established for the simultaneous determination of 23 volatile organic compounds( VOCs)in ambient air with combination of thermal desorption( TD)and gas chro-matography-triple quadrupole tandem mass spectrometry( GC-MS/MS). The air samples were collected by active sampling method using Tenax-TA sorbent tubes,and desorbed by thermal desorption. The analytes were determined by GC-MS/MS in selected reaction monitoring ( SRM)mode,and internal standard method was applied to quantify the VOCs. The results of all the 23 VOCs showed good linearities in low level(0. 01-1 ng)and high level(1-100 ng) with all the correlation coefficients(r2)more than 0. 99. The method quantification limits were between 0. 000 08-1 μg/m 3 . The method was validated by means of recovery experiments( n=6)at three spiked levels of 2,10 and 50 ng. The recoveries between 77% and 124% were gener-ally obtained. The relative standard deviations( RSDs)in all cases were lower than 20%,except for chlorobenzene at the low spiked level. The developed method was applied to determine VOCs in ambient air collected at three sites in Shanghai. Several compounds,like benzene,tol-uene,ethylbenzene,m-xylenes,p-xylenes,styrene,1,2,4-trimethylbenzene and hexachloro-butadiene were detected and confirmed in all the samples analyzed. The method is highly accu-rate,reliable and sensitive for monitoring the VOCs in ambient air.
- 出版日期2016
- 单位环境科学与工程学院; 上海交通大学
