Real-time monitoring of respiratory absorption factors of volatile organic compounds in ambient air by proton transfer reaction time-of-flight mass spectrometry

Huang, Zhi‐Zhen; Yan, Qiong; Zhang, Zhou; Wang, Xinming

doi:10.1016/j.jhazmat.2016.08.064

Cited by 29 publications

(21 citation statements)

References 90 publications

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“…The basic principles of PTR-ToF-MS have been described elsewhere in detail (Jordan et al, 2009;Huang et al, 2016). Briefly, the instrument consists of a hollow cathode ion source that generates a pure H3O + reagent ion stream, a drift tube is used to ionize VOCs, and a high resolution time-of-flight mass spectrometer separates the ions according to their mass-to-charge ratio (m/z).…”

Section: Instrument Setupmentioning

confidence: 99%

Vertical profiles of biogenic volatile organic compounds as observed online at a tower in Beijing

Zhang

Huang

Acton

et al. 2020

Journal of Environmental Sciences

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Vertical profiles of isoprene and monoterpenes were measured by a proton transfer reaction-time of flight-mass spectrometry (PTR-ToF-MS) at heights of 3, 15, 32, 64, and 102 m above the ground on the Institute of Atmospheric Physics (IAP) tower in central Beijing during the winter of 2016 and the summer of 2017. Isoprene mixing ratios were larger in summer due to much stronger local emissions whereas monoterpenes were lower in summer due largely to their consumption by much higher levels of ozone. Isoprene mixing ratios were the highest at the 32 m in summer (1.64 ± 0.66 ppbV) and at 15 m in winter (1.41 ± 0.64 ppbV) with decreasing concentrations to the ground and to the 102 m, indicating emission from the tree canopy of the surrounding parks. Monoterpene mixing ratios were the highest at the 3 m height in both the winter (0.71 ± 0.42 ppbV) and summer (0.16 ± 0.10 ppbV) with a gradual decreasing trend to 102 m, indicting an emission from near the ground level. The lowest isoprene and monoterpene mixing ratios all occurred at 102 m, which were 0.71 ± 0.42 ppbV (winter) and 1.35 ± 0.51 ppbV (summer) for isoprene, and 0.42 ± 0.22 ppbV (winter) and 0.07 ± 0.06 ppbV (summer) for monoterpenes. Isoprene in the summer and monoterpenes in the winter, as observed at the five heights, showed significant mutual correlations. In the winter monoterpenes were positively correlated with combustion tracers CO and acetonitrile at 3 m, suggesting possible anthropogenic sources.

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Section: Instrument Setupmentioning

confidence: 99%

Vertical profiles of biogenic volatile organic compounds as observed online at a tower in Beijing

Zhang

Huang

Acton

et al. 2020

Journal of Environmental Sciences

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“…In their study, biomass burning took place in a 3000 m 3 combustion chamber, and the smokes were then injected into another chamber for aging experiments with a dilution ratio of ∼ 25. Previous studies have demonstrated that levoglucosan is a semi-volatile compound with a saturation concentration of ∼ 8 µg m −3 at 293 K (Grieshop et al, 2009b;Huffman et al, 2009;Hennigan et al, 2011). As a result, the high dilution conditions used in our study would cause levoglucosan to evaporate, and this may at least partly explain the low f 60 observed in the POA from straw burning.…”

Section: Oa Mass Spectrum Evolutionmentioning

confidence: 67%

Open burning of rice, corn and wheat straws: primary emissions, photochemical aging, and secondary organic aerosol formation

Zheng¹,

Deng²,

Zhang³

et al. 2017

Preprint

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Abstract. Agricultural residues are among the most abundant biomass burned globally, especially in China. However, there is rare information on primary emissions and photochemical evolution of agricultural residues burning. In this study, indoor chamber experiments were conducted to investigate primary emissions from open burning of rice, corn and wheat straws and their photochemical aging as well. Emission factors of NOx, NH3, SO2, 67 non-methane hydrocarbons (NMHCs), particulate matter (PM), organic aerosol (OA) and black carbon (BC) under ambient dilution conditions were determined. Olefins accounted for >&#8201;50&#8201;% of the total NMHCs emission (2.47 to 5.04&#8201;g&#8201;kg&#8722;1), indicating high ozone formation potential of straw burning emissions. Emission factors of PM (3.73 to 6.36&#8201;g&#8201;kg&#8722;1) and primary organic carbon (POC, 2.05 to 4.11&#8201;gC&#8201;kg&#8722;1), measured at dilution ratios of 1300 to 4000, were lower than those reported in previous studies at low dilution ratios, probably due to the evaporation of semi-volatile organic compounds under high dilution conditions. After photochemical aging with OH exposure range of (1.97&#8211;4.97)&#8201;&#215;&#8201;1010&#8201;molecule&#8201;cm&#8722;3&#8201;s in the chamber, large amounts of secondary organic aerosol (SOA) were produced with OA mass enhancement ratios (the mass ratio of total OA to primary OA) of 2.4&#8211;7.6. The 20 known precursors could only explain 5.0&#8211;27.3&#8201;% of the observed SOA mass, suggesting that the major precursors of SOA formed from open straw burning remain unidentified. Aerosol mass spectrometry (AMS) signaled that the aged OA contained less hydrocarbons but more oxygen- and nitrogen-containing compounds than primary OA, and carbon oxidation state (OSc) calculated with AMS resolved O&#8201;/&#8201;C and H&#8201;/&#8201;C ratios increased linearly (p&#8201;<&#8201;0.001) with OH exposure with quite similar slopes.

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“…In einer Studie, in der 3 weibliche und 3 männliche Probanden über 4 h gegenüber 169-202 mg/m 3 exponiert waren, wurde stündlich der aufgenommene, ausgeatmete und im Körper verbliebene Benzol-Anteil bestimmt [38] [21]. Auch eine dermale Aufnahme von Benzol bei Exposition gegenüber kontaminierter Luft ist grundsätzlich möglich, wird aber als vernachlässigbar eingeschätzt.…”

Section: Toxikokinetikunclassified

Vorläufiger Leitwert für Benzol in der Innenraumluft

2020

Bundesgesundheitsbl

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Real-time monitoring of respiratory absorption factors of volatile organic compounds in ambient air by proton transfer reaction time-of-flight mass spectrometry

Cited by 29 publications

References 90 publications

Vertical profiles of biogenic volatile organic compounds as observed online at a tower in Beijing

Vertical profiles of biogenic volatile organic compounds as observed online at a tower in Beijing

Open burning of rice, corn and wheat straws: primary emissions, photochemical aging, and secondary organic aerosol formation

Vorläufiger Leitwert für Benzol in der Innenraumluft

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