Journal article
Ethane-Based Chemical Amplification Measurement Technique for Atmospheric Peroxy Radicals
Environmental science & technology letters, v 4(1), pp 15-19
01 Jan 2017
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Peroxy radicals play important roles in the atmospheric oxidation of organic compounds and the formation of ozone and secondary organic aerosol. There are few peroxy radical measurement techniques; the most common, chemical amplification using CO and NO, requires the use of toxic reagents, and its calibration factor is very sensitive to relative humidity. We present a new method for quantifying atmospheric peroxy radicals, ECHAMP (Ethane CHemical AMPlifier). Sampled air is mixed with NO and C2H6 (rather than CO), effecting a series of reactions that ultimately produces 25 molecules of NO2, per sampled peroxy radical under dry conditions. This "amplification" factor decreases to 17 at a relative humidity of 50%, yielding a 1 sigma precision for 90 s average measurements of 0.8-2.5 ppt depending on the atmospheric variability of ozone. We demonstrated the utility of the new technique with measurements in Bloomington, IN, in July 2015.
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Details
- Title
- Ethane-Based Chemical Amplification Measurement Technique for Atmospheric Peroxy Radicals
- Creators
- Ezra C. Wood - Drexel UniversityBenjamin L. Deming - University of Massachusetts AmherstShuvashish Kundu - University of Massachusetts Amherst
- Publication Details
- Environmental science & technology letters, v 4(1), pp 15-19
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 5
- Grant note
- AGS 1443842 / National Science Foundation; National Science Foundation (NSF) 1719918 / Div Atmospheric & Geospace Sciences; National Science Foundation (NSF); NSF - Directorate for Geosciences (GEO)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemistry
- Web of Science ID
- WOS:000391911500004
- Scopus ID
- 2-s2.0-85016142506
- Other Identifier
- 991019182668204721
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Engineering, Environmental
- Environmental Sciences