Ambient and laboratory observations of organic ammonium salts in PM₁
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2017
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01A - Journal article
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Faraday Discussions
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2017
Issue / Number
200
Pages / Duration
331-351
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Royal Society of Chemistry
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London
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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.
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620 - Ingenieurwissenschaften und Maschinenbau
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1359-6640
1364-5498
1364-5498
Language
English
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Yes
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Published
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Closed
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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