WP 3 - Study of probe sampling for particle size and chemical substance analysis

Definition of measurement protocol, design of sampling device for paint aerosol sampling

• Homogenization of air and particle distribution in a measuring chamber by fans
• Complete evaporation of the solvent for small droplets, heating air if necessary
• Control the temperature and relative humidity in the chamber
• Particle trajectory simulation to predict particle distribution and evaporation (IPA)

Measuring particles using different aerosol instruments in the chamber

• Representative probe sampling, particle size distribution, particle concentration
• Estimation of measuring error because of droplet evaporation
• Comparison of different instruments (SMPS, FMPS and ELPI)
• Comparison of the aerosol measurement results under different working conditions

Aerosol probe sampling for the chemical substance analysis

• Using impactor aerosol instruments, e.g., RESPICON (Helmut Hund GmbH) for particles in micro-meter range
• Collection and sizing of nanometer range aerosol, using ELPI or DMA operated at a fixed voltage and using nuclear filters or special probe plate
• Effect of the  amount of sample on the elemental analysis

Chemical substance analysis of non-volatile fraction of a paint aerosol

• Quantitative analysis of binder contents using thermal gravimetric analysis (TGA) as well as Raman- and IR-characterization: determination of organic

• Additional characterization of the non-volatile fraction by scanning electron microscope (SEM), energy-dispersive X-ray (EDX) as well as transmission electron

• Comparison of the aerosol measurement results under different conditions