Experimental study of the response functions of direct-reading instruments measuring surface-area concentration of airborne nanostructured particles
Titre du congrès :NANOSAFE 2008 - International Conference on Safe production and use of nanomaterials
Ville du congrès :Grenoble
Date du congrès :03/11/2008
An increasing number of experimental and theoretical studies have been looking into airborne nanoparticles (NP) in relation with many aspects of risk assessment: aerosolexposure measurement, toxicology and filtration. As a consequence, generating airborne NP with controlled properties constitutes an important challenge.
In parallel, toxicological studies have been carried out, and most of them support the concept that surface-area could be a relevant metric for characterizing exposure to airborne NP (Maynard & Aitken, 2007). To provide NP surface-area concentration measurements, some direct-reading instruments have been designed, based on attachment rate of unipolar ions to NP by diffusion. However, very few information is available concerning the performances of these instruments and the parameters that could affect their responses.
In this context, our work aims at characterizing some of these instruments providing airborne NP surface-area concentration. The selected instruments (a- NSAM, TSI model 3550; b- AeroTrak 9000, TSI; c- LQ1-DC, Matter Engineering) are thought to be relevant for further workplace exposure monitoring. To achieve this work, an experimental facility (CAIMAN) was designed, built and characterized.