多环芳烃（PAH）在实际及实验室条件下的光化学降解

Photochemical degradation of polycyclic aromatic hydrocarbons (PAH) in real and laboratory conditions.

作者信息

Valerio F, Lazzarotto A

出版信息

Int J Environ Anal Chem. 1985;23(1-2):135-51. doi: 10.1080/03067318508076440.

Abstract

Studies were carried out on the effects induced by the main components of airborne particulate matter (APM) as soot, inorganic and cyclohexane soluble substances and by glass fiber filters on photodegradation of pyrene, benz(a)anthracene and benzo(a)pyrene exposed to UV and solar radiation. In both experimental models tested hydrocarbons showed a higher photochemical stability when absorbed on APM. Inorganic components of APM slightly enhance UV photodegradation. In real condition (outdoor exposure to solar radiation) PAH half lives generally showed a good linear correlation with mean solar radiation intensity; only degradation rate of benzo(a)pyrene on APM, exposed to sunlight was practically constant. Pyrene, in particular, showed a higher degradation rate when high ozone concentrations (0.2 ppm) occurred.

摘要

开展了关于空气中颗粒物（APM）的主要成分（如煤烟、无机和环己烷可溶物质）以及玻璃纤维滤材对芘、苯并(a)蒽和苯并(a)芘在紫外线和太阳辐射下光降解的影响的研究。在两个测试的实验模型中，碳氢化合物吸附在APM上时表现出更高的光化学稳定性。APM的无机成分略微增强了紫外线光降解。在实际条件下（户外太阳辐射暴露），多环芳烃的半衰期通常与平均太阳辐射强度呈现良好的线性关系；只有暴露在阳光下的APM上的苯并(a)芘降解速率实际上是恒定的。特别是，当出现高臭氧浓度（0.2 ppm）时，芘表现出更高的降解速率。