挥发性卤代烃是环境污染化学中一类重要的污染物。它所引起的环境污染、特别是对大气臭氧层的破坏一直是全球共同关注的重大问题。在目前严格限制人为排放后，无机卤化物转化为有机卤代烃的方式、产率和环境介质的影响成为挥发性卤代烃来源研究的最热点之一。自然非生物过程的铁离子催化水介质中卤离子与腐殖酸生成卤代烃的比重超过直接排放的发现，引起了广泛关注。而该过程中太阳光作为重要的卤代烃生成驱动力被忽略。本项目期望通过揭示光照射下几类卤代烃的产生、多卤代产物分布以及进一步分解等重要的光化学过程，揭示光在环境有机质氧化降解过程中激发过渡金属离子/腐殖酸形成光活性配合物对断裂C-C键形成C-X键的关键步骤如自由基反应等。并通过和传统的暗反应比较，给出卤代烃在白昼的产生、分解规律，确认不同频率光、不同腐殖酸种类以及不同无机卤代物对非生物过程中卤代烃产生的影响规律。

Volatile halocarbons is the most important pollutants, and play an important role in environmental chemistry, such as contributing to stratospheric ozone depletion. The volatile halocarbons resulting from inorganic halide ions by natural processes have attacted extensive attention since anthropogenic halocarbons has been strictly regulated. It has been reported that halide ions can be alkylated during the oxidation of humic aicd in the presence of an eletron acceptor Fe(II), and such abiotic processes could make a siginificant contribution to the budget of the important atmospheric halocarbons. Sunlight, however, which may enhance the formation of halocarbons has been ignored. In this project we will study the effect of photochemistry on the formation and distribution of halocarbons produced by natural oxidation processes. The matrix of different wavelength, humic consituents and halide ions will be employed to study the detail of the reaction. At the end a reasonable mechamism will be proposed to interperate the finding.