北京大学学报自然科学版 ›› 2024, Vol. 60 ›› Issue (3): 563-574.DOI: 10.13209/j.0479-8023.2024.030

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基于光腔衰荡光谱技术NO3和N2O5在线测量系统的表征与应用

张田甜1, 左澎2,†, 马璟钰1, 叶春翔2, 林伟立1,†, 朱彤2   

  1. 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
  • 收稿日期:2023-12-01 修回日期:2024-01-18 出版日期:2024-05-20 发布日期:2024-05-20
  • 通讯作者: 左澎, E-mail: zuop(at)pku.edu.cn,林伟立, E-mail: linwl(at)muc.edu.cn
  • 基金资助:
    国家自然科学基金(91744206, 42375088)资助

Characterization and Application of an Online Measurement System for NO3 and N2O5 Based on Cavity Ring-Down Spectroscopy

ZHANG Tiantian1, ZUO Peng2,†, MA Jingyu1, YE Chunxiang2, LIN Weili1,†, ZHU Tong2   

  1. 1. 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 2. State Key Joint Laboratory for Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871
  • Received:2023-12-01 Revised:2024-01-18 Online:2024-05-20 Published:2024-05-20
  • Contact: ZUO Peng, E-mail: zuop(at)pku.edu.cn,LIN Weili, E-mail: linwl(at)muc.edu.cn

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摘要：

报道自主研发的基于光腔衰荡光谱技术的大气NO3/N2O5在线测量系统及其参数表征结果。在时间分辨率为1 min的情况下, NO3和 N2O5最低检测限分别为1.7×10−12和2.9×10−12。在采样流量6 L/min和使用1天滤膜的情况下, 利用标准源实验确定NO3和N2O5的采样损耗分别为17.0%和18.0%。Allan方差分析结果表明, 在60~100 s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 NO3和N2O5观测, 结果表明测量系统可以满足大气环境中NO3及N2O5的高灵敏度测量。

关键词: NO3, N2O5, 光腔衰荡光谱技术, 参数表征

Abstract:

This study presents a home-made online measurement system for atmospheric NO3/N2O5 based on cavity ring-down spectroscopy and its characterization results. The system achieves a detection limit of 1.7×10−12 for NO3 and 2.9×10−12 for N2O5 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 NO3 and N2O5 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 NO3 and N2O5 were conducted in the urban area of Beijing, and the results demonstrate that the measurement system can achieve high-sensitivity measurements of NO3 and N2O5 under atmospheric environment.

Key words: nitrate radical (NO3), dinitrogen pentoxide (N2O5), cavity ring-down spectroscopy (CRDS), parameter characterization

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