Overview

Assessment of airborne aerosol hazards in occupational settings entails sampling onto a collection substrate, followed by analysis of the collected material. The result is generally an estimated concentration of a hazardous material in the air. The uncertainty in such estimates depends on several factors, amongst other things, on the specific type of analysis employed. The standard deals with a specific type of analysis which finds the most general application in the sampling of aerosols, namely the weighing of sampled material. Gravimetric analysis, though apparently simple, is subject to uncertainty arising from instability in the mass of the sampling medium and other elements which must also be weighed. An example is provided by aerosol samplers designed to collect particles so as to agree with the inhalable aerosol sampling convention. For some sampler types, the filter and cassette are weighed together to make estimates. Therefore, uncertainty may result if the cassette, for example, absorbs or loses water between the weighings required for concentration estimation. This standard describes such uncertainty and provides solutions for minimization. The new 2009 edition of the International Standard ISO 15767 on which this standard is based has been prepared by ISO/TC 146/SC 2 "Workplace atmospheres" (secretariat: ANSI, USA) and replaces, by decision of NA 095-03-01-01 AK "Staub" ("Particulate matter"), the previous national 2004 edition without any amendments.

Document: references other documents

Document: referenced in other documents

Responsible national committee

NA 095-03-01-01 AK - Particulate matter  

Responsible international committee

ISO/TC 146/SC 2 - Workplace atmospheres