期刊
TALANTA
卷 235, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.talanta.2021.122722
关键词
In-vehicle air; Volatile organic compounds; Aldehydes and benzenes; Rapid measurement; ionization; Time-of-flight mass spectrometry
资金
- National Natural Science Foundation of China [21927804, 21904124]
- Liaoning Revitalization Talents Program [XLYC1808022]
- Natural Science Foundation of Liaoning Province [2020-MS-017]
- Dalian High-Level Talents Innovation Support Project [2019RQ101]
- Science and Technology Innovation Foundation of Dalian [2020JJ27SN102]
- Dalian Institute of Chemical Physics [DICP ZZBS201701, DICP ZZBS201801]
The newly developed PNCI-TOFMS technology enables real-time and continuous monitoring of aldehydes and benzenes in vehicles, with detection limits down to sub-ppbv levels. This technology has broad potential applications in air pollutants monitoring and in-vehicle air quality analysis.
In-vehicle air pollution has become a major concern to public health in recent years. The traditional analytical methods for detection of volatile organic compounds (VOCs) pollutants in air are based on gas chromatography mass spectrometry (GC-MS) or high-performance liquid chromatography (HPLC), including complicated pretreatment and separation procedures, which are not only time-consuming and labor-intensive, but also incapable of simultaneously measuring both aldehydes and benzenes. In this work, a new photoionization-induced NO+ chemical ionization time-of-flight mass spectrometry (PNCI-TOFMS) was developed for real-time and continuous measurement of aldehydes and benzenes in vehicles. High-intensity NO+ reactant ions could be generated by photoionization of NO reagent gas, and efficient chemical ionization between NO+ reactant ions and analyte molecules occurred to produce adduct ions M.NO+ at an elevated ion source pressure of 800 Pa. Consequently, the achieved LODs for aldehydes and benzenes were down to sub-ppbv within 60 s. The analytical capacity of this system was demonstrated by continuous and online monitoring of in-vehicle VOCs in a used car, exhibiting broad potential applications of the PNCI-TOFMS in air pollutants monitoring and in-vehicle air quality analysis.
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