大气环境中VOCs在线监测仪器校准方法研究

Development of Calibration Device for On-Line Environmental Atmospheric VOCs Analyzers

摘要: 通过新一代VOCs渗透管动态配气技术与空气基体标准添加方法的结合，建立了大气环境VOCs监测仪器在线校准方法，实现了环境空气中苯，乙苯，十一烷等挥发性有机物在线监测仪器的实时、基体添加法校准，校准不确定度小于5.1% (k = 2)。避免了传统样品富集环节带来的较大不稳定性以及测量不确定度，大大提高了校准水平和测量精度。在此基础上，制订了《大气挥发性有机物在线监测仪校准规范》(JJF 2257-2025)，为我国挥发性有机物大气在线监测仪器的校准提供了计量溯源技术支撑。

Abstract: By combining the new generation VOCs dynamic gas distribution technology of permeation tubes with the standard addition method of air matrix, an online calibration method for atmospheric VOCs monitoring instruments has been established, achieving real-time and matrix addition calibration of volatile organic compounds such as benzene, ethylbenzene, and undecane in ambient air. The calibration uncertainty is less than 5.1% (k = 2). Avoiding the significant instability and measurement uncertainty caused by the traditional sample enrichment process, greatly improving the calibration level and measurement accuracy. On this basis, the Calibration Specification for Atmospheric Volatile Organic Compounds Online Monitoring Instruments (JJF 2257-2025) was formulated and promulgated, providing metrological support for the calibration of volatile organic compound atmospheric online monitoring instruments in China.