| Title: | An in-source stretched membrane inlet for on-line analysis of VOCs in water with single photon ionization TOFMS |
| Author(s): | Hou K; Li F; Chen W; Chen P; Xie Y; Zhao W; Hua L; Pei K; Li H; |
| Address: | "Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. hli@dicp.ac.cn" |
| ISSN/ISBN: | 1364-5528 (Electronic) 0003-2654 (Linking) |
| Abstract: | "An in-source, stretched, hollow fiber membrane (HFM) inlet has been developed to improve the sensitivity of on-line time-of-flight mass spectrometry (TOFMS) with a vacuum ultraviolet (VUV) lamp based single photon ionization (SPI) source for the direct analysis of liquid samples. A 2-cm HFM was stretched to 8 cm in length, and placed in the ion source and directly under the VUV lamp window with a distance of 15 mm. Compared with the conventional flow-through configuration under the same experimental conditions, the signal intensities of selected volatile organic compounds (VOCs) of methyl tert-butyl ether (MTBE), ethyl tert-butyl ether (ETBE), benzene, toluene and p-xylene were increased over 5-fold in magnitude, and the response time was shortened to one-third. The limits of detection (LOD) of MTBE, ETBE, benzene, toluene and p-xylene ranged from 0.25 to 1.3 mug L(-1) with a measurement time of 60 s, and three orders of linear range were obtained with correlation coefficients of 0.9972-0.9992. The present results suggest that the in-source stretched HFM is a simple and effective way to increase the sensitivity and shorten response time of the membrane inlet, and we believe that it will also be beneficial to other types of on-line mass spectrometer for the on-line analysis of VOCs in water with a VUV lamp based SPI ion source" |
| Notes: | "PubMed-not-MEDLINEHou, Keyong Li, Fanglong Chen, Wendong Chen, Ping Xie, Yuanyuan Zhao, Wuduo Hua, Lei Pei, Kemei Li, Haiyang eng England 2013/08/03 Analyst. 2013 Oct 7; 138(19):5826-31. doi: 10.1039/c3an00659j" |
