Issue 19, 2013
From the journal:

Analyst

An in-source stretched membrane inlet for on-line analysis of VOCs in water with single photon ionization TOFMS†

Keyong Hou,a   Fanglong Li,b   Wendong Chen,ac   Ping Chen,ac   Yuanyuan Xie,ac   Wuduo Zhao,ac   Lei Hua,a   Kemei Peib  and  Haiyang Li*a  

* Corresponding authors

a Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
E-mail: hli@dicp.ac.cn
Fax: +86-411-84379517
Tel: +86-411-84379509

b Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, China

c University of Chinese Academy of Sciences, Beijing 100049, China

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 μg 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.

Graphical abstract: An in-source stretched membrane inlet for on-line analysis of VOCs in water with single photon ionization TOFMS

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Article information

DOI
https://doi.org/10.1039/C3AN00659J
Article type
Paper
Submitted
02 Apr 2013
Accepted
09 Jul 2013
First published
10 Jul 2013

Analyst, 2013,138, 5826-5831

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An in-source stretched membrane inlet for on-line analysis of VOCs in water with single photon ionization TOFMS

K. Hou, F. Li, W. Chen, P. Chen, Y. Xie, W. Zhao, L. Hua, K. Pei and H. Li, Analyst, 2013, 138, 5826 DOI: 10.1039/C3AN00659J

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