| 异戊二烯和甲苯二次有机示踪物的臭氧非均相氧化 |
| 摘要点击 1407 全文点击 635 投稿时间：2018-03-12 修订日期：2018-10-04 |
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| 中文关键词 烟雾箱实验 速率常数 大气寿命 示踪物产率法 不确定性 |
| 英文关键词 smog chamber experiment rate constant atmospheric life time tracer-based method uncertainty |
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| 中文摘要 |
| 本文基于相对速率法，通过烟雾箱实验测定了异戊二烯和甲苯二次有机示踪物的臭氧非均相氧化的有效速率常数，考察了不同条件（相对湿度和混合状态等）对示踪物臭氧非均相氧化过程的影响，并且分析了由于示踪物被氧化所引起的二次源解析的不确定性.结果表明，赤藓糖醇（analogue of 2-methyl erythritol，AME）和2，3-二羟基-4-氧代戊酸（2，3-dihydroxy-4-oxopentanoic acid，DHOPA）的有效速率常数分别为（4.60±0.66）×10-19 cm3·（molecule·s）-1和（6.57±0.51）×10-19 cm3·（molecule·s）-1；考虑到示踪物不稳定引起的不确定性，采用示踪物产率法解析二次源会对异戊二烯和甲苯二次生成气溶胶低估约16.5%~44.8%和18.3%~47.3%. |
| 英文摘要 |
| For this paper, chamber experiments were carried out to investigate the oxidation of secondary organic tracers of toluene and isoprene by ozone under different conditions (relative humidity, mixing state, etc.) using a relative rate constants approach. The uncertainty of the tracer-based method due to the ozone oxidation of secondary organic tracers was also addressed. The results showed that the effective rate constants of analogue of 2-methyl erythritol (AME) and 2,3-dihydroxy-4-oxopentanoic acid (DHOPA) were (4.60±0.66)×10-19 cm3·(molecule·s)-1and (6.57±0.51)×10-19 cm3·(molecule·s)-1, respectively. Given the instability of the secondary organic tracers caused by the oxidation, the contributions of toluene and isoprene to secondary organic aerosols could be underestimated by 16.5%-44.8% and 18.3%-47.3%, respectively. |
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