Development of microwave plasma proton transfer reaction mass spectrometry (MWP-PTR-MS) for on-line monitoring of volatile organic compounds: Design, characterization and performance evaluation

被引:9
作者
Zhao, Zhongjun [1 ]
Dai, Jianxiong [2 ]
Wang, Tianzhi [3 ]
Niu, Guanghui [4 ]
He, Feiyao [3 ]
Duan, Yixiang [5 ]
机构
[1] Coll Chem Engn, Chengdu 610064, Sichuan, Peoples R China
[2] Northwest Univ, Coll Chem & Mat Sci, Xian 710069, Shaanxi, Peoples R China
[3] Coll Life Sci, Chengdu 610064, Sichuan, Peoples R China
[4] Sch Aeronaut & Astronaut, Chengdu 610064, Sichuan, Peoples R China
[5] Sichuan Univ, Coll Mfg Sci & Engn, Chengdu 610064, Sichuan, Peoples R China
基金
美国国家科学基金会;
关键词
Microwave plasma; Proton transfer reaction mass spectrometry; Ion source; Volatile organic compounds; TRANSFER REACTION-TIME; IONIZATION; TRACE;
D O I
10.1016/j.talanta.2019.120468
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Proton transfer reaction mass spectrometry (PTR-MS) is a revolutionary on-line VOCs monitoring method. In this study, a new microwave plasma-based proton transfer reaction mass spectrometry (MWP-PTR-MS) is developed. The MWP consists of a surfatron type resonator and a cooperative ion extraction device to achieve high efficiency production of hydronium ions. Non-local thermodynamic equilibrium water plasma is generated in a quartz tube at 200 Pa with 2.45 GHz microwave. Characters of MWP, such as emission spectroscopy, input power, dirty ion suppressing and ion extraction, are explored systematically. With the same test platform, MWP has a 7-fold increment of hydronium ion production rate than glow discharge source. The counts rate of hydronium ion is 8 x 10(6) cps with abundance of NO+ and O-2(+) is less than 0.4% and 5% respectively. The performance of MWP-PTR-MS is validated by analysis of several chemicals and demonstration application is conducted. The instrument showed good linearity above 99% in the range of 4.5 x 10(-11) to 4.5 x 10(-9) mol/L. Benefited from the character of surface wave and 2.45 GHz microwave, MWP has high potential in improving the performance and reliability of current PTR-MS.
引用
收藏
页数:7
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