Atmospheric nitrate (NO) produced by photochemical oxidation in the atmosphere has high oxygen isotope ratios (δO values). Recently, the primary NO emitted from combustion sources was found to have much lower δO values. However, it is unclear how and to what extents the low δO signatures were controlled by major O sources during the primary NO formation of combustion processes. Here, we first measured concentrations and δO values of NO from burning five biomass materials (bb-NO and δO, respectively) in China. Distinctly higher concentration levels of the bb-NO emissions (42.1 ± 8.1 μmol m) than ambient NO suggest it is a potential source of atmospheric NO pollution. Much lower δO signatures (27.6 ± 2.7 ‰) than ambient NO support it as a primary emission source with different O sources and formation mechanism from secondary NO. Isotope mass-balance modeling revealed that atmospheric O and the biomass O dominated the O of bb-NO (53 ± 7 % and 40 ± 4 %, respectively) over the aqueous vapor (7 ± 3 %). Besides, we found increasing δO values with the biomass N contents and relatively lower δO values for biomasses with higher carbon (C) and lower O contents, indicating that biomass C, N, and O contents may influence the source O contributions of the bb-NO. This work provides a novel isotope analysis on the O source contribution of the bb-NO, which is useful for understanding the formation mechanism of combustion-related NO sources and evaluating the primary NO emissions.
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