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Advanced Particle Analysis Methods in Environmental Microscopy Studies

Explore innovative techniques in microscopy for detailed elemental composition and morphology analysis of environmental particles. Learn about sampling methods, SEM analysis, data interpretation, and more.

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Advanced Particle Analysis Methods in Environmental Microscopy Studies

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  1. DAURE Microscopy Esther Coz1,2, Gary Casuccio3, Traci L. Lersch3, Teresa Moreno2 and Begoña Artíñano1 1 Ciemat, Madrid 2 IDAEA-CSIC, Barcelona 3 RJ Lee Inc., Pittsburgh (USA) 5th DAURE Science Meeting Barcelona, May 26

  2. Outline Methods Sampling Microscopy Data analysis

  3. Methodology How? Particle Collection Scanning Electron Microscopy Energy Dispersive X-ray Spectroscopy Digital Image Analysis Data Analysis Elemental Composition Morphology

  4. Outline Methods Sampling Microscopy Data analysis

  5. Sampling Particle Collection PM2.5 samples: Low-Vol sampler • Eight-stage cascade impactor (Andersen) • Period: Feb 25 – 28 • Times: 7 am, 11 am, 5 pm and 8 am • Intervals: 30 min – 2 hours PM2.5: PC filters PM2.5-10: Aluminum substrates No fiber filters

  6. Sampling BCN site CSIC data CSIC data

  7. Sampling BCN site PSI data • PM2.5 concentrations ~ 20-60 g·m-3 • Coarse to fine PM ratios: Which complementary information does electron microscopy give?

  8. Outline Methods Sampling Microscopy Data analysis

  9. Electron Emission Electromagnetic lenses Scanning coils Signal conversion Signal conversion X-ray detector SE detector SE detector Pump Methodology Scanning Electron Microscopy Sample

  10. Field 10-E4 Methodology Scanning Electron Microscopy Qualitative Analysis Quantitative Analysis High Resolution SEM (HRSEM) Fully Computer Controlled SEM (CCSEM) FEI Sirion 400 Hitachi S5000 Personal SEM (Aspex Inc.) Shape Parameters Dmax Sp1=Dp/Dmax Dmin Dmax Sp2=Dmin/Dmax Dmin AR=Dmax/D’min Dp=(4/Area)1/2

  11. Outline Methods Sampling Microscopy Data analysis

  12. Data Analysis Particle by particle (>20,000): C, O, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Zn, Ba, Pb Clustering Heavy Metal Oxides Ammonium Sulfate (bisulfate) PrimaryBiogenic OrganicAerosols Minerals Carbonaceous & Nitrates Iron Oxides Cluster by cluster: Ti Oxides … • Particle number, Volume and mass contribution Silicates & Aluminosilicates • Size distribution Calcium Carbonates • Associated quantitative morphology (circularity, convexity, elongation and compactness) Sulfates Non sulfate salts

  13. Data Analysis Aluminosilicates: Natural vs. Industrial origin Soot-like agglomerates: Fresh vs. Aged

  14. DAURE campaign ¡¡¡¡¡Thanks to the colleagues from Ciemat, IDEAE-CSIC & RJ Lee Group, Inc. !!!!!!!!!

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