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High Loadings of Water-soluble Oxalic Acid and Related Compounds in PM_(2.5) Aerosols in Eastern Central India: Influence of Biomass Burning and Photochemical Processing
摘要
Water-soluble organic compounds are important constituents of atmospheric aerosols and have been recognized as unique fingerprints to identify atmospheric processes. Fine aerosol samples (PM_(2.5)) were collected at Ambikapur (23.1°N and 83.2°E) in eastern central India from March to June 2017. The samples were analyzed for water-soluble dicarboxylic acids (C_2-C_(12)), glyoxylic acid (ωC_2), glyoxal (Gly), methylglyoxal (MeGly), organic carbon (OC), elemental carbon (EC) and water-soluble OC (WSOC). Oxalic acid (C_2) was detected as the most abundant species, followed by succinic (C_4) and malonic (C_3) acids. Temporal variation in concentrations of C_2 diacid and related compounds was pronounced from early to late April when biomass burning (BB) was dominant in eastern central India. Strong positive correlations of C_2 diacid and related compounds with levoglucosan (r = 0.83-0.99) further demonstrate that organic aerosols (OAs) were affected by BB in eastern central India. Strong positive correlations of C_2 with saturated diacids (C_3-C_9: r = 0.78-0.97), ωC_2 (r = 0.98), Gly (r = 0.96) and MeGly (r = 0.84) suggest that their sources and formation processes were similar and oxalic acid might be produced via the photochemical degradation of precursor compounds. The relatively high ratios of WSOC to OC (avg. 0.69) and C_3 to C_4 diacid (avg. 0.95) suggest that water-soluble OAs were photochemically processed during the campaign. The total water-soluble organic compounds detected in Ambikapur PM_(2.5) samples accounted for an average of 1.9% (1.1-3.1%) of OC. Our results demonstrate that BB and photochemical processing caused high levels of water-soluble organic compounds over eastern central India.
延伸閱讀
- Lin, C., Huo, T., Yang, F., Wang, B., Chen, Y., & Wang, H. (2021). Characteristics of Water-soluble Inorganic Ions in Aerosol and Precipitation and their Scavenging Ratios in an Urban Environment in Southwest China. Aerosol and Air Quality Research, 21(5), 1-13. https://doi.org/10.4209/aaqr.200513
- Chomanee, J., Tekasakul, S., Tekasakul, P., Furuuchi, M., & Otani, Y. (2009). Effects of Moisture Content and Burning Period on Concentration of Smoke Particles and Particle-Bound Polycyclic Aromatic Hydrocarbons from Rubber-Wood Combustion. Aerosol and Air Quality Research, 9(4), 404-411. https://www.airitilibrary.com/Article/Detail?DocID=16808584-200912-200912020027-200912020027-404-411
- Kandula, N., Vakacherla, S., Bade, M., & Kiranmayi, S. (2017). Diurnal variations in the aerosol physical, optical and altitude distributional characteristics over three locations in eastern India: Implications to black carbon radiative forcing. Terrestrial, Atmospheric and Oceanic Sciences, 28(3), 315-325. https://doi.org/10.3319/TAO.2016.09.29.01
- 溫敬峰（2013）。Study on the concentration and composition variations of polycyclic aromatic hydrocarbons (PAHs) in aerosols and dry depositions in Yunlin County〔碩士論文，中山醫學大學〕。華藝線上圖書館。https://doi.org/10.6834/CSMU.2013.00021
- 李文昭、宋憶青（2006）。Effect of Synthesis Conditions on the Thermosetting Properties of Phenol-India Charcoal Bark Extractives-Formaldehyde Copolymer Resins。林產工業，25(1)，41-48。https://doi.org/10.6561/FPI.2006.25(1).5