• 关键词：二氧化氮  腔衰减相移法  在线检测  仪器研发

• 基金项目：环境空气臭氧前驱体及光化学烟雾在线监测仪的研制与产业化（No.2017YFF0108302）；泰安市大气臭氧污染成因诊断研究项目（No.SDTASJ2018-0761-00）

• 况彩菱
• 环境模拟与污染控制国家重点联合实验室, 北京大学环境科学与工程学院, 北京 100871

• 曾立民
• 1. 环境模拟与污染控制国家重点联合实验室, 北京大学环境科学与工程学院, 北京 100871;2. 江苏省大气环境监测与污染控制高技术研究重点实验室, 南京信息工程大学环境科学与工程学院, 南京 210044

• 陈仕意
• 环境模拟与污染控制国家重点联合实验室, 北京大学环境科学与工程学院, 北京 100871

• 汲惠德
• 环境模拟与污染控制国家重点联合实验室, 北京大学环境科学与工程学院, 北京 100871

• 摘要：基于腔衰减相移光谱法设计了一套二氧化氮在线分析仪，通过优化测量参数，该仪器可长期稳定运行，其时间分辨率为60 s，检出限为0.191 ppb，在0~300 ppb范围内，NO₂气体浓度与相位正切信号值具有较好的二次拟合关系，R²为0.9995.另外，该仪器在泰安站进行了长期外场观测，并与改装后的进口商品化仪器PKU-Thermo 42i-TL进行比对实验，结果表明，两者的测量结果一致性较好，R²=0.9811，表明其具有良好的运行稳定性和测定结果准确性，适用于环境大气二氧化氮浓度的在线监测.外场观测结果表明，春季泰安站二氧化氮浓度均值为12.39 ppb，有明显日变化规律.

• Abstract：An online nitrogen dioxide (NO₂) analyzer has been developed based on cavity attenuated phase shift spectroscopy (CAPS) technique (NO₂-CAPS). Under optimized instrumental settings, the instrument is shown to be running stably for long time period. The detected NO₂ concentration within 0 ppb to 300 ppb depends quadratically on the tangential phase signal (R² = 0.9995). The time resolution and the limit of detection is determined to be 60 s and 0.191 ppb, respectively. The newly developed NO₂-CAPS was running in parallel with a chemiluminescence-based commercial instrument (PKU-Thermo 42i-TL) during a field observation campaign. Good agreement is found for the NO₂ concentrations measured by both instruments (R²=0.9811), which indicated that the NO₂-CAPS is capable for online measurement of atmospheric NO₂ with good stability and accuracy. During the campaign, NO₂ showed clear diurnal variation pattern with an average concentration of 12.39 ppb.

• Key words：nitrogen dioxide  cavity attenuated phase shift spectroscopy  online measurement  research and development of instruments

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