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Effect of Humidity on the Reactive Uptake of Ammonia and Dimethylamine by Nitrogen-Containing Secondary Organic Aerosol

Journal Article · · Atmosphere (Basel)

This study investigated the uptake of ammonia (NH3) by secondary organic aerosol (SOA) particles generated via limonene photooxidation or ozonolysis as well as the uptake of dimethylamine (DMA) by limonene ozonolysis, α-cedrene photooxidation, or toluene photooxidation SOA in an environmental chamber between 0–50% relative humidity. In addition to the acid-base equilibrium uptake, NH3 and DMA can react with SOA carbonyl compounds converting them into nitrogen-containing organic compounds (NOCs). The effective reactive uptake coefficients for the formation of NOCs from ammonia were measured on the order of 10−5. The observed DMA reactive uptake coefficients ranged from 10−5 to 10−4. Typically, the reactive uptake coefficient decreased with increasing relative humidity. This is consistent with NOC formation by a condensation reaction between NH3 or DMA with SOA, which produces water as a product. Ammonia is more abundant in the atmosphere than amines. However, the larger observed reactive uptake coefficient suggests that amine uptake may also be a potential source of organic nitrogen in particulate matter.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0018349
OSTI ID:
1830267
Alternate ID(s):
OSTI ID: 1835253
Journal Information:
Atmosphere (Basel), Journal Name: Atmosphere (Basel) Journal Issue: 11 Vol. 12; ISSN 2073-4433; ISSN ATMOCZ
Publisher:
MDPI AGCopyright Statement
Country of Publication:
Switzerland
Language:
English

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