title: Development of a Portable Single Photon Ionization-Photoelectron Ionization Time-of-Flight Mass Spectrometer.
abstract: A vacuum ultraviolet lamp based single photon ionization- (SPI-) photoelectron ionization (PEI) portable reflecting time-of-flight mass spectrometer (TOFMS) was designed for online monitoring gas samples. It has a dual mode ionization source: SPI for analyte with ionization energy (IE) below 10.6 eV and PEI for IE higher than 10.6 eV. Two kinds of sampling inlets, a capillary inlet and a membrane inlet, are utilized for high concentration and trace volatile organic compounds, respectively. A mass resolution of 1100 at m/z 64 has been obtained with a total size of 40 × 31 × 29 cm, the weight is 27 kg, and the power consumption is only 70 W. A mixture of benzene, toluene, and xylene (BTX), SO2, and discharging products of SF6 were used to test its performance, and the result showed that the limit of quantitation for BTX is as low as 5 ppbv (S/N = 10 : 1) with linear dynamic ranges greater than four orders of magnitude. The portable TOFMS was also evaluated by analyzing volatile organic compounds from wine and decomposition products of SF6 inside of a gas-insulated switchgear.
authors.affiliation: Electric Power Research Institute, Guangxi Power Grid Corporation, Nanning 530023, China.
authors.forename: Yunguang
authors.initials: Y
authors.lastname: Huang
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
authors.forename: Jinxu
authors.initials: J
authors.lastname: Li
authors.affiliation: Electric Power Research Institute, Guangxi Power Grid Corporation, Nanning 530023, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Tang
authors.affiliation: Electric Power Research Institute, Guangxi Power Grid Corporation, Nanning 530023, China.
authors.forename: Liping
authors.initials: L
authors.lastname: Zhu
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
authors.forename: Keyong
authors.initials: K
authors.lastname: Hou
authors.affiliation: Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
authors.forename: Haiyang
authors.initials: H
authors.lastname: Li