Abstract
The single-photon ionization time-of-flight mass spectrometer (SPI-TOFMS), which has high sensitivity, high accuracy, and a short response time, is effective for the real-time monitoring of volatile organic compounds (VOCs). In this study, the theory and structural composition of the SPI-TOFMS are described. Its detection limit can reach parts per billion by volume (ppbv), the dynamic range is better than three orders of magnitude, and the response speed can reach milliseconds. The distribution of VOCs and the ozone generation contribution rate in the Hefei Economic Development Zone are analyzed using this instrument with a vehicle platform for online navigation detection. The experimental results showed that aromatics were the primary components of the total volatile organic compounds (TVOCs), and aromatics and alkenes contributed more to ozone formation in an industrial manufacturing area. This research indicates that the SPI-TOFMS can rapidly and accurately conduct online monitoring of VOCs in industrial development zones. In addition, it has been applied in the fields of atmospheric composition observation, environmental monitoring, and industrial VOC leakage monitoring.
Highlights
Volatile organic compounds (VOCs) are a type of organic pollutant with a boiling point of50–260 ◦ C
It should be noted that that 5 shows thethe distribution usingthe theSPI-TOFMS. It should be noted the single-photon ionization (SPI)-TOFMS cannot distinguish isomers; they were quantified under the assumptions of the SPI-TOFMS cannot distinguish isomers; they were quantified under the assumptions of being fragmentation-free and containing no other contaminants that would contribute to the signal being fragmentation-free and containing no other contaminants that would contribute to the signal intensities of the total volatile organic compounds (TVOCs)
The top 11 VOCs that contributed the most to the Figure 5b shows the distribution of VOCs in the area, with a high VOC content observed near the Naxin Daily Necessities premises
Summary
Volatile organic compounds (VOCs) are a type of organic pollutant with a boiling point of. Tonokura et al [22], Gao et al [15], and Huo et al [23] researched a compact portable SPI-TOFMS to monitor aromatic compounds in the laboratory and VOCs in car engines, passenger decks, and benzene series, such as benzene, toluene, xylene, and chlorobenzene. These studies indicated that SPI-TOFMS has great application value in environmental research and monitoring, such as for atmosphere and smog chambers, combustion and pyrolysis off-gases, off-gases from food roasting, and other VOC sources [24]. Anthropogenic emissions of VOC pollution sources primarily originate from enterprises. A mobile detection device equipped with SPI-TOFMS is built to trace VOC distributions and emission sources over a large area. The SPI-TOFMS with mobile detection technology will play a vital role in VOC pollution control in the future
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