Exposure in workplaces - Measurement of the spraying of bulk materials containing or releasing nano-objects and their respirable aggregates and clusters (NOAA) or other breathable particles - Part 1: Requirements and choice of test methods

This document provides the measuring methodology and characterizing the dustiness of a bulk material that contains or releases respirable NOAA and other respirable particles. In, it specifies the environmental conditions, the sample handling procedure and the method of calculating and the results. Guidance is given on the choice of method to be used. The described methodology in this document enables:

a) the quantification of dustiness in terms of health related dustiness mass fractions,

b) the quantification of dustiness in terms of a number-based dustiness index and a number-based emission rate, and

c) the characterization of the aerosol from its particle size distribution and the morphology and chemical composition of its particles.

NOTE 1 Currently, no number-based scheme classification in terms of particle number has been established for particle dustiness release. , when a large enough number of measurement has been obtained, the intention is to review this document and to introduce a number-based classification scheme.

This document is applicable to all bulk materials, including powders, granules or pellets, containing or releasing respirable NOAA ad other respirable particles.

NOTE 2 The vortex shaker method specified in part 5 of this standard series has not yet been evaluated for pellets and granules.

NOTE 3 The rotating drum and continuous drop methods have not yet been evaluated for nanofibres and nanoplates.

This document does not provide methods for the assessment of during particles handling or reduction mechanical by machining (e.g. crushing, cutting, sanding, sawing) of nanocomposites.