title: Measurements of the HO2 uptake coefficients onto single component organic aerosols.
abstract: Measurements of HO2 uptake coefficients (γ) were made onto a variety of organic aerosols derived from glutaric acid, glyoxal, malonic acid, stearic acid, oleic acid, squalene, monoethanol amine sulfate, monomethyl amine sulfate, and two sources of humic acid, for an initial HO2 concentration of 1 × 10(9) molecules cm(-3), room temperature and at atmospheric pressure. Values in the range of γ < 0.004 to γ = 0.008 ± 0.004 were measured for all of the aerosols apart from the aerosols from the two sources of humic acid. For humic acid aerosols, uptake coefficients in the range of γ = 0.007 ± 0.002 to γ = 0.09 ± 0.03 were measured. Elevated concentrations of copper (16 ± 1 and 380 ± 20 ppb) and iron (600 ± 30 and 51 000 ± 3000 ppb) ions were measured in the humic acid atomizer solutions compared to the other organics that can explain the higher uptake values measured. A strong dependence upon relative humidity was also observed for uptake onto humic acid, with larger uptake coefficients seen at higher humidities. Possible hypotheses for the humidity dependence include the changing liquid water content of the aerosol, a change in the mass accommodation coefficient or in the Henry's law constant.
authors: †School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, U.K.
authors: P S J
authors: PS
authors: Lakey
authors: ‡National Risk Management Research Laboratory, U.S. Environmental Protection Agency, T.W. Alexander Drive, Research Triangle Park, Durham, North Carolina 27711, United States.
authors: I J
authors: IJ
authors: George
authors: †School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, U.K.|§National Centre for Atmospheric Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, U.K.
authors: L K
authors: LK
authors: Whalley
authors: ∥Escuela de Ingeniería Industrial de Toledo, Universidad de Castilla la Mancha, Avenida Carlos III s/n Real Fábrica de Armas, Toledo, 45071, Spain.
authors: M T
authors: MT
authors: Baeza-Romero
authors: †School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, U.K.|§National Centre for Atmospheric Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, U.K.
authors: D E
authors: DE
authors: Heard
mesh_terms: D000336:Aerosols / Q000737:chemistry*; D000393:Air Pollutants / Q000737:chemistry; D001274:Atmospheric Pressure; D003300:Copper / Q000032:analysis / Q000737:chemistry; D006812:Humic Substances; D006813:Humidity; D007501:Iron / Q000032:analysis / Q000737:chemistry; D010545:Peroxides / Q000737:chemistry*; D013696:Temperature
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D006812:Humic Substances; D010545:Peroxides; D003300:Copper; D007501:Iron