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Huan Jing Ke Xue

Title:		[Development of a membrane inlet-single photon ionization/chemical ionization-mass spectrometer for online analysis of VOCs in water]
Author(s):		Hua L; Wu QH; Hou KY; Cui HP; Chen P; Zhao WD; Xie YY; Li HY;
Address:		"Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China. lhua@dicp.ac.cn"
Journal Title:		Huan Jing Ke Xue
Year:		2011
Volume:		32
Issue:		12
Page Number:		3628 - 3634
DOI:
ISSN/ISBN:		0250-3301 (Print) 0250-3301 (Linking)
Abstract:		"A home-made membrane inlet- single photon ionization/chemical ionization- time-of-flight mass spectrometer has been described. A vacuum ultraviolet (VUV) lamp with photon energy of 10.6 eV was used as the light source for single photon ionization (SPI). Chemical ionization (CI) was achieved through ion-molecule reactions with O2- reactant ions generated by photoelectron ionization. The two ionization modes could be rapidly switched by adjusting electric field in the ionization region within 2 s. Membrane inlet system used for rapid enrichment of volatile organic compounds (VOCs) in water was constructed by using a polydimethylsiloxane (PDMS) membrane with a thickness of 50 microm. A purge gas was added to accelerate desorption of analytes from the membrane surface. The purge gas could also help to prevent the pump oil back-streaming into the ionization region from the analyzer chamber and improve the signal to noise ratio (S/N). Achieved detection limits were 2 microg x L(-1) for methyl tert-butyl ether (MTBE) in SPI mode and 1 microg x L(-1) for chloroform in SPI-CI mode within 10 s analysis time, respectively. The instrument has been successfully applied to the rapid analysis of MTBE in simulated underground water nearby petrol station and VOCs in disinfected drinking water. The results indicate that the instrument has a great application prospect for online analysis of VOCs in water"
Keywords:		"Equipment Design Online Systems/*instrumentation Photons Spectrometry, Mass, Secondary Ion/*instrumentation/methods Volatile Organic Compounds/*analysis Water Pollutants, Chemical/*analysis;"
Notes:		"MedlineHua, Lei Wu, Qing-Hao Hou, Ke-Yong Cui, Hua-Peng Chen, Ping Zhao, Wu-Duo Xie, Yuan-Yuan Li, Hai-Yang chi English Abstract Research Support, Non-U.S. Gov't China 2012/04/04 Huan Jing Ke Xue. 2011 Dec; 32(12):3628-34"