Title |
Removing Water Vapor Interference in Peroxy Radical Chemical Amplification with a Large Diameter Nafion Dryer
|
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Published in |
Analytical Chemistry, February 2018
|
DOI | 10.1021/acs.analchem.7b04830 |
Pubmed ID | |
Authors |
Chengqiang Yang, Weixiong Zhao, Bo Fang, Xuezhe Xu, Yang Zhang, Yanbo Gai, Weijun Zhang, Dean S. Venables, Weidong Chen |
Abstract |
The chemical amplification (PERCA) method has been widely used for measuring peroxy radicals concentrations in the troposphere. The accuracy and sensitivity of the method is critically dependent on the chain length (CL) - that is, the number of radical amplification cycles. However, CL decreases strongly with higher relative humidity (RH). So far, there does not appear to be a method to overcome this impact. Here we report the development of a Nafion® dryer based dual-channel PERCA instrument. The large diameter Nafion® dryer efficiently removes water vapor in milliseconds and minimally affects the sample. The low losses of peroxy radicals on the NafionTM membrane make it an attractive tool for raising the CL, and thereby the measurement accuracy and sensitivity of PERCA systems. The reported instrument demonstrates this promising and simple method to minimize water vapor interference. |
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