Ambient and laboratory observations of organic ammonium salts in PM₁

Type
01A - Journal article
Editors
Editor (Corporation)
Supervisor
Parent work
Faraday Discussions
Special issue
DOI of the original publication
Link
Series
Series number
Volume
2017
Issue / Number
200
Pages / Duration
331-351
Patent number
Publisher / Publishing institution
Royal Society of Chemistry
Place of publication / Event location
London
Edition
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Abstract
Ambient measurements of PM1aerosol chemical composition at Cabauw, the Netherlands, implicate higher ammonium concentrations than explained by the formation of inorganic ammonium salts. This additional particulate ammonium is called excess ammonium (eNH4). Height profiles over the Cabauw Experimental Site for Atmospheric Research (CESAR) tower, of combined ground based and airborne aerosol mass spectrometric (AMS) measurements on a Zeppelin airship show higher concentrations ofeNH4at higher altitudes compared to the ground. Through flights across the Netherlands, the Zeppelin based measurements furthermore substantiateeNH4as a regional phenomenon in the planetary boundary layer. The excess ammonium correlates with mass spectral signatures of (di-)carboxylic acids, making a heterogeneous acid–base reaction the likely process of NH3uptake. We show that this excess ammonium was neutralized by the organic fraction forming particulate organic ammonium salts. We discuss the significance of such organic ammonium salts for atmospheric aerosols and suggest that NH3emission control will have benefits for particulate matter control beyond the reduction of inorganic ammonium salts.
Keywords
Subject (DDC)
620 - Ingenieurwissenschaften und Maschinenbau
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ISBN
ISSN
1359-6640
1364-5498
Language
English
Created during FHNW affiliation
Yes
Strategic action fields FHNW
Publication status
Published
Review
Peer review of the complete publication
Open access category
Closed
License
Citation
SCHLAG, Patrick, Florian RUBACH, Thomas F. MENTEL, David Thomas REIMER, Francesco CANONACO, Bas HENZING, M. MOERMAN, R. OTJES, André S.H. PRÉVÔT, Franz ROHRER, B. ROSATI, Ralf TILLMANN, Ernest WEINGARTNER und Astrid KIENDLER-SCHARR, 2017. Ambient and laboratory observations of organic ammonium salts in PM₁. Faraday Discussions. 2017. Bd. 2017, Nr. 200, S. 331–351. DOI 10.1039/c7fd00027h. Verfügbar unter: https://irf.fhnw.ch/handle/11654/43706