Mid carbon (C6+-C29+) in refractory black carbon aerosols is a potential tracer of open burning of rice straw: Insights from atmospheric observation and emission source studies

Fujitani, Yuji; Fushimi, Akihiro; Saitoh, Katsumi; Sato, Kei; Takami, Akinori; Kondo, Yoshinori; Toko, Kiyoshi; Kobayashi, Shinji

doi:10.1016/j.atmosenv.2020.117729

Cited by 11 publications

(1 citation statement)

References 77 publications

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“…Online measurements of SP-AMS and PTR-QiTOF were acquired for 15 min at each DF (total DF = 24−642). Calibrations of flow rate, particle size, and ionization efficiency of AMS were performed following the procedure of Fujitani et al, 33 and the organic aerosol concentration (C OA ) was corrected for interferences from CO 2 . 34 The AMS C OA was 1.7 times those of offline C OA , assuming unity collection efficiency; therefore, the AMS data were scaled to the offline data to calculate EFs.…”

Section: ■ Experimental Setupmentioning

confidence: 99%

Volatility Distribution of Organic Compounds in Sewage Incineration Emissions

Fujitani

Sato

Toko

et al. 2020

Environ. Sci. Technol.

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Intermediate volatility and semivolatile organic compounds (IVOC/ SVOC) are important precursors of secondary organic aerosol (SOA) while SVOC is an important contributor to primary organic aerosol (POA). However, combustion emissions data for volatility classes are limited. This study reports the gas and particle emissions that were sampled with various dilution factors from a sewage sludge incinerator burning fuel oil. Volatility distributions were determined using measurements from online mass spectrometry and offline organic compound analyses. In the low volatility organic compound (LVOC) to IVOC range, volatility bins with organic saturation concentrations of 10−100 μg m −3 were most abundant, which was due to organic acids generated from sludge burning. Organic aerosol (OA) emission factors (EF OA ) increased 1.4 times after cooling to ambient temperatures in comparison to those of the samples from the hot stack. Upon further isothermal dilution at 25 °C, the EF OA decreased while organic gas phase EFs increased with increasing dilution. Phase partitioning in volatility bins with saturation concentrations of 10−100 μg m −3 was sensitive to isothermal dilution that influenced the EFs. Therefore, gas-and particle-phase measurements alone cannot constrain EFs for these volatility classes. Low dilution factors may overestimate the particle phase and underestimate the gas phase EFs compared with real-world emission conditions.

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Section: ■ Experimental Setupmentioning

confidence: 99%