Monse C.,Institute For Pravention Arbeitsmedizin Deutschen Gesetzlichen Unfallversicherung |
Monz C.,Institute For Gefahrstoff Forschung Der Berufsgenossenschaft Rohstoffe Und Chemische Industrie |
Dahmann D.,Institute For Gefahrstoff Forschung Der Berufsgenossenschaft Rohstoffe Und Chemische Industrie |
Asbach C.,Institute For Energie Und Umwelttechnik Iuta |
And 6 more authors.
Gefahrstoffe Reinhaltung der Luft | Year: 2013
The German MAK committee recommended in 2009 a lower threshold limit value for airborne zinc. An adapted human inhalation study was setup to corroborate this recommendation. The technical development and the validation of a suitable flame generator system were realized as a necessary prerequisite for a human inhalation study with zinc oxide (ZnO) in the exposure laboratory (ExpoLab) at the Institute for prevention and occupational medicine of the German social accident insurance, Institute of the Ruhr-University Bochum. We demonstrate here the properties of the nanoparticle generator that has the important advantage of very low emissions of trace gases below the occupational exposure limits by using aqueous zinc acetate solutions. The pyrolysis process yields a very good temporal stability of airborne ZnO particles. The maximum target exposure mass concentration of 2 mg/m3 ZnO in the respirable fraction can be reached. The morphological examination shows typical agglomerates and aggregates formed by high temperature processes. The generator produces monomodal particle size distributions with median particle diameters between 10 and 100 nm. Source