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Measurements of the HO_2 Uptake Coefficients onto Single Component Organic Aerosols

机译：单组分有机气溶胶中HO_2吸收系数的测量

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摘要

Measurements of HO_2 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 HO_2 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.
机译：测量了戊二酸，乙二醛，丙二酸，硬脂酸，油酸，角鲨烯，硫酸单乙醇胺，硫酸单甲胺和两种腐殖酸来源的各种有机气溶胶的HO_2吸收系数（γ）。在室温和大气压下，初始HO_2浓度为1×10〜9分子cm〜（-3）。除来自两个腐殖酸来源的气溶胶外，所有气溶胶的γ值都在γ＜0.004到γ= 0.008±0.004的范围内。对于腐殖酸气雾剂，测量的吸收系数在γ= 0.007±0.002至γ= 0.09±0.03的范围内。与其他有机物相比，在腐殖酸雾化器溶液中测得的铜离子（16±1和380±20 ppb）和铁离子（600±30和51 000±3000 ppb）的浓度升高，这可以解释所测得的较高吸收值。还观察到对腐殖酸的吸收强烈依赖于相对湿度，在较高湿度下观察到较大的吸收系数。关于湿度依赖性的可能假设包括气雾剂中液态水含量的变化，质量容纳系数或亨利定律常数的变化。

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  • 来源
    《Environmental Science & Technology》 |2015年第8期|4878-4885|共8页
  • 作者

    P. S. J. Lakey; I. J. George; L. K. Whalley; M. T. Baeza-Romero; D. E. Heard;

  • 作者单位

    School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, U.K.;

    National Risk Management Research Laboratory, U.S. Environmental Protection Agency, T.W. Alexander Drive, Research Triangle Park, Durham, North Carolina 27711, United States;

    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.;

    Escuela de Ingenieria Industrial de Toledo, Universidad de Castilla la Mancha, Avenida Carlos Ⅲ s Real Fabrica de Armas, Toledo. 45071, Spain;

    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.;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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