基于光腔衰荡光谱技术NO_(3)和N_(2)O_(5)在线测量系统的表征与应用  

Characterization and Application of an Online Measurement System for NO_(3) and N_(2)O_(5) Based on Cavity Ring-Down Spectroscopy

作　　者：张田甜 左澎 马璟钰 叶春翔 林伟立 朱彤[2] ZHANG Tiantian;ZUO Peng;MA Jingyu;YE Chunxiang;LIN Weili;ZHU Tong(Key Laboratory of Ecology and Environment in Minority Areas(Minzu University of China),National Ethnic Affairs Commission of the People’s Republic of China,Beijing 100081;State Key Joint Laboratory for Environmental Simulation and Pollution Control,College of Environmental Sciences and Engineering,Peking University,Beijing 100871)

机构地区：[1]民族地区生态环境国家民委重点实验室(中央民族大学),北京100081 [2]环境模拟与污染控制国家重点实验室,北京大学环境科学与工程学院,北京100871

出　　处：《北京大学学报（自然科学版）》2024年第3期563-574,共12页Acta Scientiarum Naturalium Universitatis Pekinensis

基　　金：国家自然科学基金(91744206,42375088)资助。

摘　　要：报道自主研发的基于光腔衰荡光谱技术的大气NO_(3)/N_(2)O_(5)在线测量系统及其参数表征结果。在时间分辨率为1min的情况下,NO_(3)和N_(2)O_(5)最低检测限分别为1.7×10^(-12)和2.9×10^(-12)。在采样流量6L/min和使用1天滤膜的情况下,利用标准源实验确定NO_(3)和N_(2)O_(5)的采样损耗分别为17.0%和18.0%。Allan方差分析结果表明,在60~100s积分条件下可获得较好的系统稳定性。在北京城区开展大气NO_(3)和N_(2)O_(5)观测,结果表明测量系统可以满足大气环境中NO_(3)及N_(2)O_(5)的高灵敏度测量。This study presents a home-made online measurement system for atmospheric NO_(3)/N_(2)O_(5) based on cavity ring-down spectroscopy and its characterization results.The system achieves a detection limit of 1.7×10^(-12) for NO_(3) and 2.9×10^(-12) for N_(2)O_(5) at a time resolution of 1 minute.Under sampling conditions of 6 L/min flow rate and a filter membrane used for 1 day,the sampling loss for NO_(3) and N_(2)O_(5) is determined to be 17.0%and 18.0%,respectively.Allan variance analysis indicates an optimal system stability at integration times between 60 and 100 seconds.Field measurements of NO_(3) and N_(2)O_(5) were conducted in the urban area of Beijing,and the results demonstrate that the measurement system can achieve high-sensitivity measurements of NO_(3) and N_(2)O_(5) under atmospheric environment.

关 键 词：NO_(3) N_(2)O_(5) 光腔衰荡光谱技术 参数表征 

分 类 号：X831[环境科学与工程—环境工程]