Formation of insoluble brown carbon through iron-catalyzed reaction of biomass burning organics

Abstract

Biomass burning organic aerosol (BBOA) is one of the largest sources of organics in the atmosphere. Mineral dust and biomass burning smoke frequently co-exist in the same atmospheric environment. Common...

Formation of nitrogen-containing gas phase products from the heterogeneous (photo)reaction of NO2 with gallic acid

“…These processed Fe-containing particles can act as a sink for semivolatile organics from biomass burning and undergo mixing with biomass burning organic aerosol. The role of Fe in the aqueous phase formation of water-soluble and insoluble secondary light-absorbing organic products was reported in a number of lab studies using standard organic compounds 22 – 24 or acidic extracts of biomass burning organic aerosol 24 . These studies highlighted the effect of Fe-catalyzed reactions on the morphology, hygroscopic, and ice nucleation properties of insoluble products and standard dust samples.…”

Iron content in aerosol particles and its impact on atmospheric chemistry

“…The results from LDI-ToF-MS mass spectral analyses in the range of m/z 200–600 suggested the presence of dimers, trimers, and tetramers of catechol (MW 110), guaiacol (MW 124), and coniferaldehyde (MW 178). Mass spectral shapes for the secondary particles in the 500–700 °C samples 48 were comparable indicating that at these three pyrolysis temperatures, similar products were formed. The fast spectral collection following the addition of Fe( iii ) in Fig.…”

“…These studies were followed by systematic investigations of the effect of the burning temperature on BBOA. 48 In these experiments, the pyrolysis of dried pine needles took place in a tube furnace under an inert atmosphere and the emitted organic aerosol (OA) was collected on filters as a function of temperature. Fig.…”

“…9,47 In Section 2, the effect of pyrolysis temperature in producing BBOA is presented, whose acid extracts vary in their reactivity with soluble Fe to produce secondary BrC. 48 In Section 3, the focus is on NOC produced from Fe-catalyzed reactions with water soluble aminophenols 49 and from the heterogeneous uptake of NO 2 with gallic acid 50 in the dark and under simulated solar irradiation. In Section 4, the dissolution of Fe-containing AZTD and fly ash due to simulated atmospheric aging and human exposure experiments is presented, where the aqueous phase levels of trace elements Cu, Mn, As, and Pb are also compared to Fe and correlated with measured physical properties of the solids.…”

Photolytic aging of organic aerosol from pyrolyzed urban materials

“…Experiments were conducted similarly to our previous work on biomass pyrolysis. 50 Pyrolysis is the thermal decomposition of biomass under oxygen limited conditions with temperatures between 300 and 800 °C. 51 Fires often transition between smoldering (450–700 °C) and flaming (1500–1800 °C) combustion with their genesis process being pyrolysis.…”