Citation: ZHU Xiaoping, MA Huilian, ZHU Xiuhua, CHEN Jiping. Determination of 67 volatile organic compounds in ambient air using thermal desorption-gas chromatography-mass spectrometry[J]. Chinese Journal of Chromatography, ;2019, 37(11): 1228-1234. doi: 10.3724/SP.J.1123.2019.04043 shu

Determination of 67 volatile organic compounds in ambient air using thermal desorption-gas chromatography-mass spectrometry

1.
School of Environmental and Chemical Engineering, Dalian Jiaotong University, Dalian 116028, China;
2.
Chinese Academy of Sciences(CAS) Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China

Received Date: 28 April 2019

Fund Project: National Natural Science Foundation of China (No. 21707139).

A method based on thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS) was developed for the simultaneous analysis of 67 volatile organic compounds (VOCs) in ambient air. In this study, the adsorption effects of five kinds of stainless steel sorbent tubes for 78 VOCs were compared. The results revealed that a multisorbent bed with Carbograph 1TD and Tenax TA shows good adsorption effect for the 67 target compounds. The breakthrough rates of all the target compounds were less than 10% when high-purity helium gas was continuously purged for 45 min at 30 mL/min. The analytes included aromatic hydrocarbons, aliphatic hydrocarbons, halogenated hydrocarbons, and oxygen-containing volatile organic compounds. The thermal desorption conditions for the determination of the target substances were optimized. In the range 5-100 ng, the chromatographic response of the target compounds had a good linear relationship with their corresponding amounts, and the correlation coefficient (r) was between 1.0000 and 0.9977. The method detection limits (MDLs) were 0.3-2.4 ng or 0.3-2.4 μg/m³, as calculated by a 1 L sampling volume. The method was validated by means of recovery experiments (n=7) with the addition of 20 ng standard samples. The recoveries of all the target compounds were in the range of 81.6%-114.9%, and their relative standard deviations (RSDs) were in the range of 1.2%-10.2%. The VOCs present in the air in a carriage were detected using this method. The 19 target compounds included esters, halogenated alkanes, halogenated olefins, and aromatic substances, whose concentrations ranged from 1.1 to 84.1 μg/m³. These results indicated that our method is accurate, reliable, and sensitive, and can allow for accurate quantification of the 67 target pollutants in ambient air.
- thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS),
- volatile organic compounds (VOCs),
- sorbent tube,
- ambient air,
- breakthrough
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沈阳化工大学材料科学与工程学院沈阳 110142