大气环境中OH自由基测定

Determination of OH Free Radical Concentration in Atmosphere

采用自旋捕集技术和电子自旋共振法结合测定大气环境中OH自由基。首先用自旋捕集剂将OH自由基捕集,生成比较稳定的自旋加合物,然后带回实验室处理测定。该法为开展大气光化学研究提供了一种采样方便、利于实测的方法。据3个采样点的实测结果表明,相对误差约为35％,比文献所示结果略大。

Determination of OH free radical concentration in atmosphere has been conducted by using ESR. A spin trap 4-POBN was used for trapping OH free radical in atmosphere and forming a stable OH-adduct. The adduct was extracted and analyzed by ESR spectroscopy. The sampling method is simple and convenient. It also showed that OH radical concentration at three different sites were determined, the relative deviation was about 35%, greater than the references.