Exposure in the workplace - Measurement of dustiness of massive materials that contain or may release nanomaterials or their aggregates and agglomerates (NOAA), or other respirable particles - Part 3: Continuous drip method

The standard specifies the methodology for measuring and characterizing the dustiness of bulk materials that contain or release NOAA, or other respirable particles, in standard and reproducible conditions, using the continuous drip method. The document describes the type of instruments and devices, and the procedures for calculating and presenting the results. It also indicates the guidelines for the evaluation and how to report the data. The methodology described in this document allows: a) the measurement of the mass fraction of breathable dustiness, and possibly also the inhalable one, b) the measurement of the dustiness index based on the particle count in the airborne dust fraction having an aerodynamic diameter between 10 nm and 1 µm, c) the measurement of the emission speed based on the number of particles in the airborne dust fraction having diameter aerodynamic between 10 nm to about 1 µm, d) measurement of the particle distribution in the aerosol released in the range of aerodynamic diameter between 10 nm to about 10 µm, e) collection of the particles in the respirable dust fraction for observations and subsequent analysis by electron microscopy. This document is applicable for the analysis of a wide range of materials including powders, granulates or pellets that contain or release respirable NOAAs, or other respirable particles either in unbound form, or in bound but not covered form or only covered .