In the context of the precautionary principle for engineered nano-particles, a test able to verify the non exposure of an individual to nano-aerosols seems to be of great interest, especially for workers involved with nano materials. A novel method is proposed to detect the presence of nano particles in the nose. Different materials, including paper and polycarbonate, have been tested for their sampling efficiency towards ZnO nano particles. The detection of nano particles is performed by elemental analysis using Total Reflection X-Ray Fluorescence (TXRF). For an optimal sensitivity of the TXRF signal, samples have to be deposited on a smooth surface. Therefore, different materials have been compared as sample carrier. The results indicate that pure paper is the most efficient material for sampling nano particles (ZnO), while the use of polycarbonate, and even more flexible polyester, as sample carrier allows a better sensitivity for TXRF analysis. Therefore, the sampling device made of paper is digested under slightly acidic conditions in a microwave oven after collection, and the resulting solution is deposited on polyester for TXRF analysis. Internal calibration is performed. The proposed method allows the chemical identification of nano particles deposited in the nose: a qualitative signature of a potential nano aerosol inhalation.
Authors: Marie-Desvergne, C.; Tardif, F.; Motellier, S.; Mossuz, V. ;Full Source: Journal of Physics: Conference Series [online computer file] 2011, 304, 012016/1-012016/8 (Eng) ;