Development of a self-cleaning dispersion and exposure chamber: Application to the monitoring of simulated accidents involving the generation of airborne nanoparticles

摘要: Abstract The release of hazardous nanoparticulate matter in accidental situations was simulated a specially designed 13-m3 stainless steel airtight chamber, which allowed the dispersion analysis airborne practically particle-free environment (less than 2 #/cm3) and presence background atmospheric aerosols. A fast recovering initial situation achieved by means tandem HEPA-filtered air deionized water system. Both unintended spilling silica-based powders continuous emission 100-nm SiO2 nanoparticles were used as aerosol generation events. analyzed terms particle number concentrations (PNC), size distributions source strengths. aerosols reached peak PNC for particles range from 5 nm to 1 μm with strengths about 108 #/h background-filled 1010 atmosphere. No agglomeration noticed released nanoparticles, suggesting that low enough prevent coagulation diameters over 80 nm. Results indicate emitted within most penetrating sizes similar scenarios.