Measurements of the HO2 uptake coefficients onto single component organic aerosols.
Measurements of the HO2 uptake coefficients onto single component organic aerosols.
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DOI：
10.1021/acs.est.5b00948
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发表时间：
2015-04
影响因子：
11.4
通讯作者：
P. Lakey;I. George;L. Whalley;M. Baeza_Romero;D. Heard
中科院分区：
文献类型：
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作者：
P. Lakey;I. George;L. Whalley;M. Baeza_Romero;D. Heard
对源自戊二酸、乙二醛、丙二酸、硬脂酸、油酸、角鲨烯、单乙醇胺硫酸盐、单甲胺硫酸盐和两种腐殖酸来源的各种有机气溶胶进行了 HO2 吸收系数 (γ) 的测量，初始 HO2 浓度为 1 × 10(9) 分子 cm(-3)，室温 温度和大气压下。除了来自两种腐殖酸来源的气溶胶之外，对所有气溶胶测量了 γ < 0.004 至 γ = 0.008 ± 0.004 范围内的值。对于腐殖酸气溶胶，测量的吸收系数在 γ = 0.007 ± 0.002 至 γ = 0.09 ± 0.03 范围内。与其他有机物相比，在腐殖酸雾化器溶液中测量到的铜离子（16 ± 1 和 380 ± 20 ppb）和铁离子（600 ± 30 和 51 000 ± 3000 ppb）浓度升高，这可以解释测量到的较高吸收值。还观察到腐植酸的吸收对相对湿度的强烈依赖性，在较高湿度下观察到较大的吸收系数。湿度依赖性的可能假设包括气溶胶液态水含量的变化、质量调节系数或亨利定律常数的变化。
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.