ATMOSPHERIC REACTIONS OF SINGLET OXYGEN

单重态分子氧以三角态(德尔塔02)的形式被 被确认为潜在的大气氧化剂。尽管周围环境中的 Delta 02尚未很好地建立，我们已经能够生成Delta 02 在一个大气压下研究它的化学成分。平均寿命Tau 被确定为约为0.1秒，因此，它的寿命很长 足以与大气污染物发生反应。我们建议德尔塔02是 一种使大气中有毒物质含量较低的毒剂。 在假设中，多环芳烃吸附在颗粒材料上，吸收阳光和 敏化由近基态氧形成的增量02。 Delta 02然后在颗粒表面与接近的多环芳烃反应，形成 含氧多环芳烃，其中许多已知具有诱变性和/或 致癌物质。我们将研究两种多环芳烃的反应。 苯并[a]菲，吸附在带有增量02的模型颗粒上，以及 确定多环芳烃是否自激活(就其致突变性而言) 通过产品研究和Ames测试。光的效果，然后 光和氧对多环芳烃在颗粒表面的反应也将是 学习。将进行产品标识和Ames测试。一个 对结果的详细分析将表明Delta 02在多大程度上 参与了光氧化的全部化学转化 反应和其他过程(第一类或电子转移 进程)都涉及。

Singlet molecular oxygen in the form of the delta state (delta 02) has been identified as a potential atmospheric oxidant. Although ambient levels of delta 02 are not well established, we have been able to generate delta 02 at one atmosphere pressure and study its chemistry. The mean lifetime Tau was determined to be of the order of 0.1 sec and thus, it is long lived enough to react with atmospheric pollutants. We propose that delta 02 is an agent giving rises to low levels of toxic material in the atmosphere. In the hypothesis PAH adsorbed on particulate material absorb sunlight and sensitize the formation of delta 02 from proximate ground state oxygen. Delta 02 then reacts with proximate PAH on particulate surfaces forming oxygenated PAH, many of which are known to be mutagenic and/or carcinogenic. We will investigate the reaction of two PAHs, chrysene and benza[a]anthracene, adsorbed on model particulate with delta 02, and determine if PAH are self-activated (with respect to their mutagenicity) through product studies and Ames testing. The effect of light and then light and oxygen on the reaction of PAH on particle surfaces will also be studied. Product identification and Ames testing will be performed. A detailed analysis of the results will indicate the extent to which delta 02 is involved in the total chemical transformations of photooxidation reactions and whether other processes (Type I or electron transfer processes) are involved.