基于气液相化学发光技术的臭氧在线检测方法

基于鲁米诺(luminol) 化学发光体系,采用自主研发的在线臭氧浓度检测仪,建立了一种实时在线检测臭氧浓度的方法,用于分析测定痕量浓度水平的臭氧气体。 考察了鲁米诺、氢氧化钾、部分醇类化合物和表面活性剂等因素对化学发光强度的影响。 结果表明,在鲁米诺(0.005 mol/L)、氢氧化钾(0.05 mol/L)体系中加入乙二醇(体积分数1.5%)、甲醇(体积分数1.5%)、乙醇(体积分数1.0%)、丙三醇(体积分数3.0%)能显著增强鲁米诺体系检测O₃的化学发光信号,而甲醛溶液 (体积分数3.0%)能有效抑制NO₂信号的干扰。 同时,测得检测臭氧的检出限为1.26 μg/m³、相对标准偏差为0.32%,相对误差为0.75%。 利用该体系测定臭氧,具有信号稳定、精密度好、准确度高、检出限低等优点,适用于大气中微量O₃的在线连续检测。

Online Ozone Detection Method Based on Gas-Liquid Phase Chemiluminescence Technology

Based on luminol chemiluminescence system, a self-developed online ozone concentration detector was used to establish a real-time online method for detecting ozone concentration for the determination of ozone gas at trace level. The effects of luminol, potassium hydroxide, alcohols and surfactants on the chemiluminescence intensity were investigated. The results showed that ethylene glycol (volume fraction 1.5%), methanol (volume fraction 1.5%), ethanol (volume fraction 1.0%), and glycerol (volume fraction 3.0%) were added to luminol (0.005 mol/L) and potassium hydroxide (0.05 mol/L) can significantly enhance the luminescence signal of O₃ in the luminol system, and formaldehyde (volume fraction 3.0%) can effectively inhibit the interference of NO₂ signal. At the same time, the detection limit of ozone was 1.26 μg/m³, the relative standard deviation was 0.32%, and the relative error was 0.75%. This ozone determination system has the advantages of stable signal, good precision, high accuracy and low detection limit. It is suitable for online continuous detection of trace O₃ in the atmosphere.