Metallic and Crustal Elements in Biomass-Burning Aerosol and Ash: Prevalence, Significance, and Similarity to Soil Particles

作者：Leif G. Jahn, Lydia G. Jahl, Garret D. Bland, Bailey B. Bowers, Luke Monroe, Ryan C. Sullivan · 发表于：ACS Earth and Space Chemistry · 年份：2020 · DOI：10.1021/acsearthspacechem.0c00191 · 被引用次数：41 · 研究领域：Atmospheric chemistry and aerosols、Air Quality and Health Impacts、Coal and Its By-products

The morphology and composition of laboratory-generated biomass-burning aerosol (BBA) and bottom ash particles from authentic fuels were determined using transmission and scanning electron microscopies (TEM/SEM) and single-particle inductively coupled plasma time-of-flight mass spectrometry (sp-ICP-ToF-MS). BBA particles with mineral material identified through elemental analysis using SEM represented 3–25% of the individual BBA particle numbers analyzed. This percentage varied depending on the fuel, with BBA from grass fuels containing more mineral particles than BBA from ponderosa pine wood. TEM analysis showed that these particles typically consist of carbonaceous material and a small (50–500 nm) region rich in nonvolatile elements. We also performed SEM/EDX analysis on soil, mineral BBA, and ash particles to measure Si:Al:Fe ratios and show that each of these particle classes possesses a different average bulk composition. However, individual particles within each population possess varying Si:Al:Fe ratios that may not be sufficiently unique to consistently determine particle sources from single-particle analysis. Mineral regions in BBA particles were similar in composition to residual bottom ash particles but were more likely to contain mixtures of nonvolatile elements, suggesting that ash particles typically underwent more complete combustion and mineralization. Multielement sp-ICP-ToF-MS analysis confirmed the presence of mineral particles in BBA, ash, and soil samples,...