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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-275
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-275
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 05 Sep 2019

Submitted as: research article | 05 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Chemical discrimination of the particulate and gas phases of miniCAST exhausts using a two-filter collection method

Linh Dan Ngo1,2, Dumitru Duca1, Yvain Carpentier1, Jennifer A. Noble1,a, Raouf Ikhenazene1, Marin Vojkovic1, Cornelia Irimiea3, Ismael K. Ortega3, Guillaume Lefevre4, Jérôme Yon4, Alessandro Faccinetto2, Eric Therssen2, Michael Ziskind1, Bertrand Chazallon1, Claire Pirim1, and Cristian Focsa1 Linh Dan Ngo et al.
  • 1Univ. Lille, CNRS, UMR 8523 – PhLAM – Laboratoire de Physique des Lasers Atomes et Molécules, F-59000 Lille, France
  • 2Univ. Lille, CNRS, UMR 8522 – PC2A – Physicochimie des Processus de Combustion et de l’Atmosphère, F-59000 Lille, France
  • 3ONERA –The French Aerospace Laboratory, F-91123 Palaiseau, France
  • 4Normandie Univ., INSA Rouen, UNIROUEN, CNRS, CORIA, 76000 Rouen, France
  • anow at: CNRS, Aix Marseille Université, PIIM, UMR 7345, 13397 Marseille cedex, France

Abstract. Combustion of hydrocarbons produces both particulate and gas phase emissions responsible for major impacts on atmospheric chemistry and human health. Ascertaining the impact of these emissions, especially on human health, is not straightforward because of our relatively poor knowledge of how chemical compounds are partitioned between the particle and gas phases. Accordingly, we propose to couple a two-filter sampling method with a multi-technique analytical approach to fully characterize the particulate and gas phase compositions of combustion by-products. The two-filter sampling method is designed to retain particulate matter (elemental carbon possibly covered in a surface layer of adsorbed molecules) on a first quartz fiber filter while letting the gas phase pass through, and then trap the most volatile components on a second black carbon-covered filter. All samples thus collected are subsequently subjected to a multi-technique analytical protocol involving two-step laser mass spectrometry (L2MS), secondary ion mass spectrometry (SIMS), and micro-Raman spectroscopy. Using the combination of this two-filter sampling/multi-technique approach in conjunction with advanced statistical methods we are able to unravel distinct surface chemical compositions of aerosols generated with different set points of a miniCAST burner. Specifically, we successfully discriminate samples by their volatile, semi-volatile and non-volatile polycyclic aromatic hydrocarbon (PAH) contents and reveal how subtle changes in combustion parameters affect particle surface chemistry.

Linh Dan Ngo et al.
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Short summary
The partitioning of noxious chemical compounds between the particulate and gas phases in combustion emissions is key to delineate their exact impacts on atmospheric chemistry and human health. We developed a two-filter sampling system, a multi-technique analytical approach, and advanced statistical methods to fully characterize the composition of both phases in combustion emissions. We could successfully discriminate samples from a standard soot generator by their volatile/non-volatile species.
The partitioning of noxious chemical compounds between the particulate and gas phases in...
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