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Séminaire


Multidimensional physicochemical characterization of airborne particles by the combined use of single particle analytical techniques

Date
le 25-01-2019 à 11:00

Lieu
Salle de Conférences, ISM, 3ème étage Est, Bât. A12, Université de Bordeaux

Intervenant(s)
Chul-Un Ro, Department of Chemistry, Inha University

Résumé
Recently, the potential of the combined use of a quantitative energy-dispersive electron probe X-ray microanalysis (ED-EPMA), called low-Z particle EPMA, and attenuated total reflectance FTIR (ATR-FTIR) imaging techniques for characterization of individual aerosol particles has been demonstrated [1]. The two single particle analytical techniques provide complementary information on the physicochemical characteristics of the same individual particles, such as low-Z particle EPMA technique on morphology and elemental concentrations and ATR-FT-IR imaging technique on molecular species, crystal structures, functional groups, and physical state.
In addition, the feasibility of the combined use of low-Z particle EPMA and Raman microspectrometry (RMS) for the characterization of chemical species and internal mixing state of the same individual particles was investigated [2]. The characterization of individual particles including chemical speciation and mixing state analysis can be performed more in detail using either ED-EPMA and RMS or ED-EPMA and ATR-FTIR imaging in combination than with the two single particle techniques alone.
An analytical method for the characterization of hygroscopic property, chemical composition, and morphology of individual aerosol particles was developed, which was based on the combined use of optical and electron microscopic techniques [3]. An optical microscopic (OM) technique was used to perform the visual observation of phase transformation and hygroscopic growth of single-component and ambient aerosol particles according to relative humidity (RH) change. The same technique was extended to derive experimental phase diagrams for deliquescence and efflorescence and obtain chemical micro-structures on an individual particle level for multi-component aerosol surrogates. SEM/EDX and/or low-Z particle EPMA was used to perform elemental mapping or quantitative chemical speciation of the same individual particles after the measurement of their hygroscopic property. Recently, in-situ RMS has been used to complement the OM technique to observe phase and structural transitions according to RH change. The combination of OM, RMS, and SEM/EDX or low-Z EPMA can be used to study the hygroscopic behavior and aqueous phase chemistry of more complex laboratory generated or ambient inorganic?organic mixture aerosol particles.
In this talk, the combined use of the single particle analytical techniques such as hygroscopic measurement system, ATR-FTIR imaging, RMS, and/or low-Z particle EPMA for the systematic characterization of the same individual particles will be presented.

References
[1] Anal. Chem. 81, 6695-6707(2009); Anal. Chem. 82, 6193-6202(2010); Anal. Chem. 82, 7987-7998(2010); Environ. Sci. Technol. 45, 6275-6282(2011); Anal. Chem. 83, 7970-7977(2011); Atmos. Chem. Phys. 13, 3463-3480(2013)
[2] Anal. Chem. 84, 3145-3154 (2012); Anal. Chem. 85, 10424?10431 (2013)
[3] Anal. Chem. 82, 7999-8009 (2010); Anal. Chem. 86, 2648-2656, (2014);
Atmos. Environ., 82, 36-43, (2014); Atmos. Chem. Phys. 15, 3379-3393, (2015);
Environ. Sci. Technol. 51, 263-270(2017)
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