The measurement of fibrous inorganic particles with WHO dimensions is carried out according to VDI 3492 or at workplaces according to DGUV-Information 213-546. However, both methods are not suitable for determining the concentration of airborne nanoscale WHO fibers. Both methods only count fibers down to a diameter of 0.2 μm. That is why the BAuA in the BMBF project nanoGRAVUR together with the Institute for Occupational Safety of the German Social Accident Insurance (IFA) and the Swiss Accident Insurance Institute (SUVA) laid the foundations for a new measurement and evaluation procedure for nanoscale fibrous materials. In particular, the need to extend the previously limited counting range of VDI 3492 and DGUV Information 213-546 at least down to a fiber diameter of 0.02 μm was emphasized.
Within the DGUV funded project, a validation of the new measuring method is now carried out on real workplaces. The aim of the work is to check the measuring method for practical suitability for sampling, scanning electron microscopic evaluation and fiber morphology assignment. After evaluating the workplace measurements, a revision of the first convention can be carried out (together with partner institutes) and the results of the work can be incorporated into relevant regulations (DGUV Information 213-546, VDI 3492, CEN TC 137, OECD).
At the same time, the project will provide important information on possible exposures to activities involving CNT, and an assessment of exposures to CNTs will be possible for the first time in relation to the 10,000 F / m³ assessment scale.
Unit 4.5 "Particulate Hazardous Substances, Advanced Materials"