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Ambient air -- Measurement of the mass of particulate matter on a filter medium -- Beta-ray absorption method
This International Standard describes a method for the measurement of the mass of particulate matter in ambient air and is based on the absorption of beta rays by the particulate matter.
This method applies to the determination of concentrations ranging from a few micrograms per cubic metre to a few milligrams per cubic metre contained in the atmospheres of urban, rural or industrial areas.
The lower mass detection limit of the method is usually 15 ÎĽg to 30 ÎĽg of deposited mass per square centimetre of surface area, S, of the filter. This means, for a sampling time t of 3 h and a flowrate q of 1 m3/h, that the concentration detection limit ranges between 5 ÎĽg/m3and 10 ÎĽg/m3, computed as follows:
Concentration(μg/cm2)·S(cm2)/q(m3/h)·1/t(h)
Sampling techniques are not included in the scope of this International Standard.
| SDO | ISO: International Organization for Standardization |
| Document Number | ISO 10473 |
| Publication Date | Not Available |
| Language | en - English |
| Page Count | |
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| Supercedes | |
| Committee | ISO TC 146/SC 3 |
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