Molecular Chemistry of Atmospheric Brown Carbon Inferred from a Nationwide Biomass Burning Event | Zendy

Peng Lin | Zendy; Nir Bluvshtein | Zendy; Yi Rudich | Zendy; Sergey A. Nizkorodov | Zendy; Julia Laskin | Zendy; Alexander Laskin | Zendy

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Molecular Chemistry of Atmospheric Brown Carbon Inferred from a Nationwide Biomass Burning Event

Author(s) -

Peng Lin,

Nir Bluvshtein,

Yi Rudich,

Sergey A. Nizkorodov,

Julia Laskin,

Alexander Laskin

Publication year - 2017

Publication title -

environmental science and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.851

H-Index - 397

eISSN - 1520-5851

pISSN - 0013-936X

DOI - 10.1021/acs.est.7b02276

Subject(s) - chromophore , chemistry , biomass burning , aerosol , absorption (acoustics) , solvent , absorption spectroscopy , photochemistry , environmental chemistry , molar absorptivity , analytical chemistry (journal) , organic chemistry , materials science , optics , physics , composite material

Lag Ba'Omer, a nationwide bonfire festival in Israel, was chosen as a case study to investigate the influence of a major biomass burning event on the light absorption properties of atmospheric brown carbon (BrC). The chemical composition and optical properties of BrC chromophores were investigated using a high performance liquid chromatography (HPLC) platform coupled to photo diode array (PDA) and high resolution mass spectrometry (HRMS) detectors. Substantial increase of BrC light absorption coefficient was observed during the night-long biomass burning event. Most chromophores observed during the event were attributed to nitroaromatic compounds (NAC), comprising 28 elemental formulas of at least 63 structural isomers. The NAC, in combination, accounted for 50-80% of the total visible light absorption (>400 nm) by solvent extractable BrC. The results highlight that NAC, in particular nitrophenols, are important light absorption contributors of biomass burning organic aerosol (BBOA), suggesting that night time chemistry of •NO 3 and N 2 O 5 with particles may play a significant role in atmospheric transformations of BrC. Nitrophenols and related compounds were especially important chromophores of BBOA. The absorption spectra of the BrC chromophores are influenced by the extraction solvent and solution pH, implying that the aerosol acidity is an important factor controlling the light absorption properties of BrC.

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