| Title: | [Determination of 104 volatile organic compounds in air by double column gas chromatography-mass spectrometry/flame ionization detector coupled with electronically controlled cryo-focusing unit] |
| Author(s): | Zhang T; Zhang Y; Du Z; Dao X; Zhang X; Cao G; Jia Y; Du S; Tang K; Shan D; Zhou H; Zhou R; |
| Address: | "National Research Center for Environmental Analysis and Measurements(CNEAC), Beijing 100029, China. China National Environmental Monitoring Center(CNEMC), Beijing 100012, China. Beijing Branch, Shimadzu(China) Co. Ltd, Beijing 100020, China" |
| DOI: | 10.3724/SP.J.1123.2018.12022 |
| ISSN/ISBN: | 1872-2059 (Electronic) 1000-8713 (Linking) |
| Abstract: | "A method for the determination of 104 volatile organic compounds (VOCs) in ambient air based on double column multi dean switching gas chromatography-mass spectrometry/flame ionization detector (GC-MS/FID) coupled with sorbent assisted electronically controlled cryo-focusing unit was developed and evaluated. The sorbent assisted electronically controlled cryo-focusing unit was used for trapping, dehydration and focusing of VOCs sampled in summa canisters. The VOCs were split into two parts by the multi dean switching unit in GC-MS/FID. The C(2)-C(3) components were determined in a PLOT capillary column with an FID detector, while the C(4)-C(12) components were determined in an Intercap-624 capillary column with a MS detector. The C(2)-C(3) components were qualitatively confirmed from the retention time and quantified by the calibration curves, while the C(4)-C(12) components were qualitatively confirmed from the retention time and the relative abundance ratio of characteristic ions, and quantified by the internal standard calibration curves. The major factors influencing the cryo-focusing performance including the type of sorbent tube, the pressure employed in assisted pressure control unit (APC), and the split point in multi dean switching unit were investigated. The chromatographic and MS parameters were optimized. Under optimum conditions, a linear relationship was observed with the content of VOCs ranging from 0.0446 to 0.892 mumol/m(3), and correlation coefficients (r) no less than 0.9984. The average spiked recoveries of the six VOCs at two levels of 0.0446 mumol/m(3) and 0.223 mumol/m(3) were 86.4%-116.1%, with relative standard deviations in the range of 0.9%-11.3% The method detection limits (MDLs) and the limits of quantification (LOQs) were 0.145-1.90 mug/m(3) and 0.435-5.70 mug/m(3), respectively. The method is accurate, sensitive and simple, and is suitable for the determination of the 104 VOCs in ambient air" |
| Keywords: | ambient air double column gas chromatography-mass spectrometry/flame ionization detector (double column GC-MS/FID) electronically controlled cryo-focusing multi dean switching volatile organic compounds; |
| Notes: | "PubMed-not-MEDLINEZhang, Ting Zhang, Yixiang Du, Zhenyu Dao, Xu Zhang, Xiulan Cao, Guan Jia, Yueqing Du, Shijuan Tang, Ka Shan, Danying Zhou, Hao Zhou, Rui chi English Abstract China 2019/04/13 Se Pu. 2019 Apr 8; 37(4):418-425. doi: 10.3724/SP.J.1123.2018.12022" |
