不同采样膜对PM_(2.5)样品产生OH自由基的影响研究

Impacts of Different Sampling Filters on the Generation of OH Free Radicals in PM_(2.5) Samples

不同材质的采样膜中金属离子形态和含量各有差异,且对不同污染源PM_(2.5)样品产生的OH自由有影响。本试验在汽车尾气和餐饮油烟两种污染源环境下,通过对石英膜和特氟龙膜采集的PM_(2.5)样品产生OH自由基含量、水溶态金属离子形态和含量进行比较。结果表明,空白石英滤膜产生OH自由基的速率是空白特氟龙滤膜的四倍,且石英膜中金属离子形态和含量较特氟龙膜高,因此用石英滤膜采集PM_(2.5)样品对其产生OH自由基的测定有干扰作用。

There are differences in metal ions morphology and content of different sampling filter, and have an impact on the OH free radicals of PM2.5 samples of different pollution sources. In automobile exhaust and dining lampblack pollution environment, compared the content of OH free radical, metal ions form and content in PM2.5 samples were collected with quartz and teflon filters. The results showed that the rate of OH free radicals produced by the blank quartz filters was four times higher than that of the blank teflon filters, and the metal ions form and content in the quartz filters were higher than that of the teflon filters. Therefore, the collection of PM2.5 samples with quartz filters interferes with the determination of OH free radicals.