ã€Instrument Development of China Instrument Network】 Recently, the Research Group of Anguang Institute of Researcher Zhang Weijun has made a breakthrough in the measurement of atmospheric peroxy radicals by chemical amplification. Related research results have been achieved by removing the water vapor interference in peroxy radical chemical amplification with a large diameter. The Nafion dryer was published in the Analytical Chemistry (a zone) organized by the American Chemical Society.
Variation of RO2 Concentration in Primary Pollution Process in Actual Atmospheric Observation
Peroxy radicals (RO2) play an important role in the degradation of atmospheric volatile organic compounds (VOCs) and the formation of ozone (O3) and secondary organic aerosols (SOA), with low atmospheric concentrations and strong activity. Measurement is difficult. Chemical amplification is one of the most important methods for measuring RO2 in the atmosphere. It converts low concentrations of RO2 into high concentrations of NO2 through chain-type cyclic reactions to achieve an amplified measurement of RO2, but the actual atmospheric background (such as O3, NO2) The influence of water vapor, etc., limits the sensitivity and accuracy of RO2 measurements. The research team effectively eliminated the influence of O3, NO2, etc. on the measurement through the dual-channel wideband cavity enhanced absorption spectroscopy technology developed in the early stage, and realized the detection limit of peroxy radical 0.9pptv at 60s sampling time. However, the influence of water vapor on the reaction chain length (water effect) has always been an insurmountable problem in chemical amplification, which limits the application of chemical amplification in the actual atmosphere.
Researcher Zhao Weixiong and Yang Chengqiang et al. proposed a dual-channel atmospheric peroxy radical measurement technique based on Nafion tube injection. This not only reduces the RO2 sample loss, but also effectively avoids the high relative humidity that affects the reaction chain length. influences. At present, the instrument has been used in practical observation experiments in laboratories and the PRD field and will play an important role in the study of atmospheric chemistry mechanisms.
The research work was supported by the National Natural Science Foundation of China, the National Key Research and Development Program of the Ministry of Science and Technology, the Chinese Academy of Sciences Green Promotion Association and the Anhui Outstanding Youth Fund. At present, the technology and device have applied for national invention patent protection CN200810053909.1.
(Original Title: Achievers New Breakthrough in Atmospheric Peroxy Radical Measurement Technology)
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