| 顺磁共振法测定气相中OH自由基的研究 |
| 摘要点击 882 全文点击 1888 投稿时间：1998-12-10 |
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| 中文关键词 电子顺磁共振 自旋捕集 OH自由基 气相 大气污染化学 |
| 英文关键词 EPR spin trapping OH radical gas-phase atmospheric pollution chemistry |
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| 中文摘要 |
| 采用电子顺磁共振(EPR)法测定气相中OH自由基的研究表明,4-POBN 是气相中OH自由基的较好自旋捕集剂,得到的4-POBN-OH加合物稳定性好.样品避光保存2d 后,测得EPR谱的峰形和大小不变.测得OH加合物的EPR谱中超精细偶合常数分别为αN= 1.45mT和αHβ= 0.22mT.除去样品溶液中微量的O2,将改善EPR谱的峰形.还报道了用这种方法对上海地区大气中采样实测得到OH加合物的EPR谱,它与实验室模拟试验的EPR谱相符。 |
| 英文摘要 |
| The paper described the method of detecting gas-phase ·OH using Electron Paramagnetic Resonance(EPR).Hydroxyl radical was trapped in a spin trap to form a stable hydroxyl adduct and determined by Electron Paramagnetic Resonance later.4-POBN was chosen as the spin trap because it showed the higher ·OH trapping ability and the higher stability of spin adduct.The EPR spectra of OH-adduct remains unchanged without light for two days.The hyperfine coincidence constants, αN and αHβ were 1.45mT and 0.22mT respectively.Also it was showed that the EPR spectra of OH-adduct from atmosphere sampling in Shanghai were in agreement with those obtained from the model experiments. |
