Hydroxyl Radical Generation from Environmentally Persistent Free Radicals (EPFRs) in PM2.5

被引：258

作者：

Gehling, William ^{[1
]}

Khachatryan, Lavrent ^{[1
]}

Dellinger, Barry ^{[1
]}

机构：

[1] Louisiana State Univ, Dept Chem, Baton Rouge, LA 70803 USA

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2014年 / 48卷 / 08期

基金：

美国国家科学基金会;

关键词：

ELECTRON-PARAMAGNETIC-RESONANCE; AIRBORNE PARTICULATE MATTER; HYDROGEN-PEROXIDE; OXIDATIVE STRESS; TRANSITION-METALS; AIR-POLLUTION; AMBIENT PM2.5; IRON; PARTICLES; TOXICITY;

D O I：

10.1021/es401770y

中图分类号：

X [环境科学、安全科学];

学科分类号：

083001 [环境科学];

摘要：

Hydroxyl radicals were generated from an aqueous suspension of ambient PM2.5 and detected utilizing 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) as a spin trap coupled with electron paramagnetic resonance (EPR) spectroscopy. Results from this study suggested the importance of environmentally persistent free radicals (EPFRs) in PM2.5 to generate significant levels of center dot OH without the addition of H2O2. Particles for which the EPFRs were allowed to decay over time induced less hydroxyl radical. Additionally, higher particle concentrations produced more hydroxyl radical. Some samples did not alter hydroxyl radical generation when the solution was purged by air. This is ascribed to internal, rather than external surface associated EPFRs.

引用

页码：4266 / 4272

页数：7

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