Uptake and UV-photooxidation of gas-phase PAHs on the surface of atmospheric water films. 1. Naphthalene

Chen  J; Ehrenhauser  FS; Valsaraj  KTWornat  MJ

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Uptake and UV-photooxidation of gas-phase PAHs on the surface of atmospheric water films. 1. Naphthalene

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The adsorption and photochemical reaction of naphthalene vapor at the air-water interface of water films ( 22 Am and 450 Am) were studied in a horizontal flow reactor. Experiments were conducted in the regime where gas-phase mass transfer resistance did not limit the uptake. The equilibrium uptake was dependent on water film thickness only below 1 Am. Bulk water-air and air-to-interface partition constants were estimated from the experiments. The equilibrium partition constant between the water film and air decreased with increasing temperature. Photochemical reaction products were isolated in the water film after exposure to UV light. Four main oxygenated products were identified (1,3- indandione, 1(3H)-isobenzofuranone ( phthalide), 2H-1-benzopyran-2-one (coumarin), and 1-naphthol). The initial rates of product formation were 46 to 154 larger for the thin film (22 mu m) compared to both a thick film ( 450 Am) and bulk aqueous phase photooxidation. The atmospheric implications of reactions in water films are discussed.

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《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |2006年第29期|9161-9168|共8页
作者
Chen J; Ehrenhauser FS; Valsaraj KTWornat MJ;
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作者单位

Louisiana State Univ, Cain Dept Chem Engn, Baton Rouge, LA 70803 USA;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
关键词
POLYCYCLIC AROMATIC-HYDROCARBONS; AIR-AQUEOUS INTERFACE; FOG DROPLETS; CHEMISTRY; OXIDATION; ADSORPTION; KINETICS; OZONE; IRRADIATION; MECHANISMS;

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Uptake and UV-photooxidation of gas-phase PAHs on the surface of atmospheric water films. 1. Naphthalene

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