Photooxidation of Leaf-Wound Oxygenated Compounds, 1-Penten-3-ol, (Z)-3-Hexen-1-ol, and 1-Penten-3-one, Initiated by OH Radicals and Sunlight
Photooxidation of Leaf-Wound Oxygenated Compounds, 1-Penten-3-ol, (Z)-3-Hexen-1-ol, and 1-Penten-3-one, Initiated by OH Radicals and Sunlight
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DOI：
10.1021/es8027814
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发表时间：
2009-03-15
影响因子：
11.4
通讯作者：
Albaladejo, Jose
中科院分区：
文献类型：
--
作者：
Jimenez, Elena;Lanza, Beatriz;Albaladejo, Jose
本文介绍了应力诱导化合物1-戊烯-3-醇、(Z)-3-己烯-1-醇和1-戊烯-3- 1（乙基乙烯酮，EVK）对环境的影响。这里考虑的去除过程是与羟基（OH）自由基的气相反应和光化区（290 nm以上）的光解反应。采用紫外可见光谱法（λ = 200 ~ 390 nm）测定气相吸收截面的波长依赖性（sigma(lambda)）。首次以温度（T = 263 ~ 353 K）为函数研究了羟基与戊基化合物的反应动力学。得到的OH速率系数k(OH) (cm(3)分子（-1）s（-1）和+/-sigma的T依赖性的Arrhenius表达式分别为（7.7 +/- 0.8）× 10(-12) exp{(606 +/- 30)/T}， EVK为（4.4 +/- 1.4）× 10(-12) exp{(507 +/- 90)/T}。(Z)-3-己烯-1-的k（OH）为298 k。实验证据表明，对戊基化合物的对流层脱除主要是与OH自由基的气相反应。然而，O-3和NO3自由基可能与OH自由基竞争，成为(Z)-3-己烯-1-醇的对流层汇。这些化合物的光解作用预计在对流层中不太重要。
An evaluation of the environmental impact of stressed-induced compounds, 1-penten-3-ol,(Z)-3-hexen-1-ol, and 1-penten-3-one (ethyl vinyl ketone, EVK), is presented in this paper. The removal processes considered here are the gas-phase reactions with hydroxyl (OH) radicals and photolysis in the actinic region (above 290 nm). The wavelength dependence of the gas-phase absorption cross-sections (sigma(lambda)) was measured by UV-visible spectroscopy (lambda = 200-390 nm). The kinetic study of the OH-reaction with pentenyl compounds has been performed as a function of temperature (T = 263-353 K) for the first time. The resulting Arrhenius expressions for the T-dependence of the OH-rate coefficient, k(OH) (in cm(3) molecule(-1) s(-1) and uncertainties of +/-sigma), were (7.7 +/- 0.8) x 10(-12) exp{(606 +/- 30)/T} for 1-penten-3-ol and (4.4 +/- 1.4) x 10(-12) exp{(507 +/- 90)/T} for EVK, respectively. k(OH) for (Z)-3-hexen-1- is reported at 298 K. The experimental evidence shows that the major tropospheric removal of pentenyl compounds is the gas-phase reaction with OH radicals. However, O-3 and NO3 radicals may compete with OH radicals as tropospheric sinks of (Z)-3-hexen-1-ol. Photolysis of these compounds is expected to be of minor importance in the troposphere.