Ultrafine organic aerosol particles inhaled by mice at low doses remain in lungs more than half a year.

Experimental results of the second series of experiments on the penetration of monodisperse polymeric particles, inhaled at low dose by mice, to different organs using direct way of particle registration, based on the ultra-sensitive accelerator mass spectrometer (AMS), are presented. Polystyrene (PS) beads, composed of radiocarbon-labeled styrene, were produced for testing them as model organic aerosols. Mice inhaled C-PS aerosol of 3·10 ultrafine particles per 1 cm for 30 minutes every day during 5 days.