Molecular Characterization of Nitrogen-Containing Organic Compounds in Humic-like Substances Emitted from Straw Residue Burning

• DOI: 10.1021/acs.est.7b00248
• Publication Date: 2017-05-10T18:30:37Z
• Authors: Yujue Wang; Min Hu; Peng Lin; Qingfeng Guo; Zhijun Wu; Mengren Li; Limin Zeng; Yu Song; Liwu Zeng; Yusheng Wu; Song Guo; Xiaofeng Huang; Lingyan He
• Keywords: Levoglucosan; Crop Residue; Residue (chemistry)

The molecular composition of humic-like substances (HULIS) in different aerosol samples was analyzed using an ultrahigh-resolution mass spectrometer to investigate the influence biomass burning on ambient composition. HULIS background aerosols were characterized with numerous formulas similar biogenic secondary organic aerosols. abundance nitrogen-containing compounds (NOC), including bases (N-bases) and nitroaromatics, increased dramatically affected by crop residue farm field. distribution N-bases these exhibited patterns those observed smoke particles freshly emitted from lab-controlled straw residues but significantly wood burning. Signal intensity major correlated well atmospheric concentrations potassium levoglucosan. These can serve as markers distinguishing More nitroaromatics detected than fresh aerosols, indicating that many them are formed oxidation processes plumes evolve atmosphere. This study highlights significant contribution NOC. Further is warranted evaluate roles NOC climate human health.