Development of portable single photon ionization time-of-flight mass spectrometer combined with membrane inlet

Gao, Wei; Tan, Guobin; Hong, Yi; Li, Mei; Nian, Huiqing; Guo, Changlei; Huang, Zhengxu; Fu, Zhong; Dong, Jun; Xu, Xiaojun; Cheng, Ping; Zhou, Zhen

doi:10.1016/j.ijms.2012.09.003

Cited by 44 publications

(26 citation statements)

References 18 publications

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“…This TOF-MS has a LOD of approximately 1 ppb for most of the trace gases. 51 The average air exchange rate calculated from the decay of CO2 was ca. 0.6 h -1 , in agreement with UV light (330 nm # l # 400 nm) penetrates indoors, which can allow the photochemistry to occur.…”

mentioning

confidence: 99%

Assessing indoor gas phase oxidation capacity through real-time measurements of HONO and NO_xin Guangzhou, China

Liu

Zeng

et al. 2019

Environ. Sci.: Processes Impacts

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confidence: 99%

Assessing indoor gas phase oxidation capacity through real-time measurements of HONO and NO_xin Guangzhou, China

Liu

Zeng

et al. 2019

Environ. Sci.: Processes Impacts

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“…Six alkenes are analyzed in this study, i.e., including propylene, butylene, butadiene, isoprene, pentene and hexene, which 110 were detected by a single photon ionization time-of-flight mass spectrometer (SPI-MS 3000, Guangzhou Hexin Instrument Co., Ltd., China) (Gao et al, 2013). It should be mentioned that this instrument cannot distinguish conformers, and therefore the pentene and haxene could also be cyclopentane and cyclohexane, respectively.…”

Section: Measurement Of Alkenes With Spi-msmentioning

confidence: 99%

Formation of Nighttime Sulfuric Acid from the Ozonolysis of Alkenes in Beijing

Guo¹,

Yan²,

Li³

et al. 2020

Preprint

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Abstract. Gaseous sulfuric acid (SA) has received a lot of attention for its crucial role in atmospheric new particle formation (NPF), and for this reason, studies until now have mainly focused on daytime SA when most NPF events occur. While daytime SA production is driven by SO2 oxidation of OH radicals from photochemical origin, the formation of SA during night and its potential influence on particle formation remains poorly understood. Here we present evidence for significant nighttime SA production in urban Beijing during winter, yielding concentrations between 1.0 and 3.0 × 106 cm−3. We found a high frequency (~ 30 %) of nighttime SA events, which are defined by the appearance of a distinct SA peak observed between 20:00 and 04:00 local time, and with the maximum concentration exceeding 1.0 × 106 cm−3. These events mostly occurred during unpolluted nights with low vapor condensation sink. Furthermore, we found that under very clean conditions (visibility > 16.0 km) with abundant ozone (concentration > 2.0 × 1011 cm−3, ~ 7 ppb), the overall sink of SA was strongly correlated with the products of O3, alkenes and SO2 concentrations, suggesting that the ozonolysis of alkenes played a major role in nighttime SA formation under such conditions. This is in light with previous studies showing that the ozonolysis of alkenes can form OH radical and stabilized Criegee intermediate (sCI), both of which are able to oxidize SO2 leading to SA formation. However, we also need to point out that there exist additional sources of SA under more polluted condition, which are not investigated in this study. Moreover, there was a strong correlation between SA concentration and the number concentration of sub-3 nm particles in both clean and polluted nights. Different from forest environments, where oxidized biogenic vapors are the main driver of nighttime clustering, our study demonstrates that the formation of nighttime cluster mode particles in urban environments is mainly driven by nighttime SA production.

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“…The design of the TOF MS took a full consideration of the characteristics of this kind of ion source, such as dense ion beam density, wildly distribution of kinetic ion energies and so on. Unlike previous TOF MS developed by our team [18][19][20][21][22], a small extraction hole was set in the orthogonal acceleration region, and an ion detector with a large rectangular effective area was set for the TOF MS, cooperating with dual anodes.…”

Section: Instrumentationmentioning

confidence: 99%

“…The standard curves of samples, with good linearity, can be obtained by external standard method. In other words, the MCP output is proportional to ion current of sample [18,21,22,30,31].…”

Section: Single Impulses and Mass Resolutionmentioning

confidence: 99%

Development of a miniature time-of-flight mass/charge spectrometer for ion beam source analyzing

Huang

Tan

Zhou

et al. 2015

International Journal of Mass Spectrometry

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Development of portable single photon ionization time-of-flight mass spectrometer combined with membrane inlet

Cited by 44 publications

References 18 publications

Assessing indoor gas phase oxidation capacity through real-time measurements of HONO and NO_xin Guangzhou, China

Assessing indoor gas phase oxidation capacity through real-time measurements of HONO and NO_xin Guangzhou, China

Formation of Nighttime Sulfuric Acid from the Ozonolysis of Alkenes in Beijing

Development of a miniature time-of-flight mass/charge spectrometer for ion beam source analyzing

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Development of portable single photon ionization time-of-flight mass spectrometer combined with membrane inlet

Cited by 44 publications

References 18 publications

Assessing indoor gas phase oxidation capacity through real-time measurements of HONO and NOxin Guangzhou, China

Assessing indoor gas phase oxidation capacity through real-time measurements of HONO and NOxin Guangzhou, China

Formation of Nighttime Sulfuric Acid from the Ozonolysis of Alkenes in Beijing

Development of a miniature time-of-flight mass/charge spectrometer for ion beam source analyzing

Contact Info

Product

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Assessing indoor gas phase oxidation capacity through real-time measurements of HONO and NO_xin Guangzhou, China

Assessing indoor gas phase oxidation capacity through real-time measurements of HONO and NO_xin Guangzhou, China