Abstract
An instrument is developed for the measurement of peroxy radical using chemical amplification coupled with NO2-luminol chemiluminescence detection. The chain length of 147 ± 10 (1σ) is determined by an HO2 source that uses the photolysis of water vapor under 184.9 nm in air. A Nafion system equipped with a Nafion tube of ~2.2 mm external diameter and 350 mm length is employed in the PERCA instrument (Nafion-PERCA system). When flowing an air sample containing HO2 through the Nafion system, it is found that - 94.6 % of HO2 is removed. In contrast, only 17.8 % of RO2 radicals (a mixtures of CH3O2 and CH3C(O)O2 with a ratio of 1.1:0.9) are removed. The results indicate the Nafion system has a good selective removing performance of HO2 radical during the PERCA measurement. Therefore, the method could be applied to ambient and laboratory measurements of absolute concentrations of RO2 as well as the sum of HO2 and RO2.
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The work described in this paper was supported by the National Natural Science Foundation of China (No: 21207081), and Shandong Provincial Natural Science Foundation (No: ZR2012DQ001).
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Wang, Z., Yang, B. & Zhang, T. A method for the selective measurement of HO2 and RO2 radical concentrations using a Nafion-PERCA system. J Atmos Chem 73, 397–406 (2016). https://doi.org/10.1007/s10874-016-9335-7
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DOI: https://doi.org/10.1007/s10874-016-9335-7