Improved Chemical Amplification Instrument ...
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Article dans une revue scientifique: Article original
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Title :
Improved Chemical Amplification Instrument by Using a Nafion Dryer as an Amplification Reactor for Quantifying Atmospheric Peroxy Radicals under Ambient Conditions
Author(s) :
Yang, Chengqiang [Auteur]
University of Science and Technology of China [Hefei] [USTC]
Anhui Institute of Optics and Fine Mechanics
Zhao, Weixiong [Auteur]
Anhui Institute of Optics and Fine Mechanics
Fang, Bo [Auteur]
Anhui Institute of Optics and Fine Mechanics
Yu, Hui [Auteur]
Anhui Institute of Optics and Fine Mechanics
Xu, Xuezhe [Auteur]
Anhui Institute of Optics and Fine Mechanics
Zhang, Yang [Auteur]
Anhui Institute of Optics and Fine Mechanics
Gai, Yanbo [Auteur]
Anhui Institute of Optics and Fine Mechanics
Zhang, Weijun [Auteur]
University of Science and Technology of China [Hefei] [USTC]
Anhui Institute of Optics and Fine Mechanics
Chen, Weidong [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Fittschen, Christa [Auteur]
Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522 [PC2A]
University of Science and Technology of China [Hefei] [USTC]
Anhui Institute of Optics and Fine Mechanics
Zhao, Weixiong [Auteur]
Anhui Institute of Optics and Fine Mechanics
Fang, Bo [Auteur]
Anhui Institute of Optics and Fine Mechanics
Yu, Hui [Auteur]
Anhui Institute of Optics and Fine Mechanics
Xu, Xuezhe [Auteur]
Anhui Institute of Optics and Fine Mechanics
Zhang, Yang [Auteur]
Anhui Institute of Optics and Fine Mechanics
Gai, Yanbo [Auteur]
Anhui Institute of Optics and Fine Mechanics
Zhang, Weijun [Auteur]
University of Science and Technology of China [Hefei] [USTC]
Anhui Institute of Optics and Fine Mechanics
Chen, Weidong [Auteur]
Laboratoire de Physico-Chimie de l'Atmosphère [LPCA]
Fittschen, Christa [Auteur]

Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522 [PC2A]
Journal title :
Analytical Chemistry
Abbreviated title :
Anal. Chem.
Volume number :
91
Pages :
776-779
Publisher :
American Chemical Society (ACS)
Publication date :
2019-01-01
HAL domain(s) :
Physique [physics]/Physique [physics]/Chimie-Physique [physics.chem-ph]
Chimie/Chimie théorique et/ou physique
Chimie/Chimie théorique et/ou physique
English abstract : [en]
In our previous work (Yang et al. Anal. Chem. 2018, 90 (5), 3307−3312), we reported that a large diameter Nafion dryer can be used in the PERCA (PEroxy Radical Chemical Amplification) technique to minimize the impact of ...
Show more >In our previous work (Yang et al. Anal. Chem. 2018, 90 (5), 3307−3312), we reported that a large diameter Nafion dryer can be used in the PERCA (PEroxy Radical Chemical Amplification) technique to minimize the impact of water vapor on the chain length (CL). By using a Nafion dryer, the sample was first dried to a low relative humidity (RH) and was then drawn into a FEP (fluorinated ethylene propylene) flow reactor tube to start the amplification cycles for peroxy radical measurement. This method provides a promising and simple method to minimize the sensitivity of CL to water vapor. However, there is a trade-off between inlet radical losses and moisture removal efficiency under high ambient RH conditions. In this paper, we report a further improvement by removing the inlet Nafion dryer and using it directly as an amplifier. The sample was drawn into the Nafion dryer directly without preconditioning to reduce inlet losses; the amplification and HO2 reformation cycles were started in the Nafion dryer. The CL value at 3% RHinlet was about 150. A linear relationship between CL and RHinlet up to 87% RH was observed. Low loss of the CL under high RHinlet (about 10% reduction at 87% RH) was achieved. As a result, the modified system can largely remove the uncertainty of the CL arising from water vapor under most ambient conditions.Show less >
Show more >In our previous work (Yang et al. Anal. Chem. 2018, 90 (5), 3307−3312), we reported that a large diameter Nafion dryer can be used in the PERCA (PEroxy Radical Chemical Amplification) technique to minimize the impact of water vapor on the chain length (CL). By using a Nafion dryer, the sample was first dried to a low relative humidity (RH) and was then drawn into a FEP (fluorinated ethylene propylene) flow reactor tube to start the amplification cycles for peroxy radical measurement. This method provides a promising and simple method to minimize the sensitivity of CL to water vapor. However, there is a trade-off between inlet radical losses and moisture removal efficiency under high ambient RH conditions. In this paper, we report a further improvement by removing the inlet Nafion dryer and using it directly as an amplifier. The sample was drawn into the Nafion dryer directly without preconditioning to reduce inlet losses; the amplification and HO2 reformation cycles were started in the Nafion dryer. The CL value at 3% RHinlet was about 150. A linear relationship between CL and RHinlet up to 87% RH was observed. Low loss of the CL under high RHinlet (about 10% reduction at 87% RH) was achieved. As a result, the modified system can largely remove the uncertainty of the CL arising from water vapor under most ambient conditions.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Non spécifiée
Administrative institution(s) :
Université de Lille
CNRS
CNRS
Research team(s) :
PhysicoChimie de l'Atmosphère (PCA)
Submission date :
2020-10-07T13:05:31Z
2020-10-08T08:30:30Z
2020-10-08T08:30:30Z
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