Abstract: The gas phase calibration source of hydroxyl radical was established using photolysis of H₂O at 184.9 nm UV-light produced by low-pressure Hg lamp. The concentration of OH was inferred from the concentrations of O₃ and H₂O in the flow. The OH concentration was also measured using salicylic acid liquid phase scrubbing and high performance liquid chromatography (HPLC) technique. The relationship between the calculated and measured OH concentrations was relatively uniform. The surface effect in the photolysis tube was studied using laser-induced fluorescence signal and was not of importance.

Key words: hydroxyl radical, calibration source, liquid phase scrubbing, atmospheric chemistry

摘要： 利用H₂O在184.9 nm紫外光照射下光解产生OH自由基建立了气相OH标准发生源，通过测量气流中O₃和H₂O浓度计算得到OH浓度，此计算浓度与利用水杨酸液相吸收-高效液相色谱法测得的OH浓度比较一致，同时用激光诱导荧光技术对可能存在的壁效应进行研究，结果表明在较高流速下其影响较小。

关键词: 氢氧自由基, 标准源, 液相吸收, 大气化学