<p>This International Standard describes a method for the measurement of the mass of particulate matter in ambient</p>
<p>air and is based on the absorption of beta rays by the particulate matter.</p>
<p>This method applies to the determination of concentrations ranging from a few micrograms per cubic metre to a few</p>
<p>milligrams per cubic metre contained in the atmospheres of urban, rural or industrial areas.</p>
<p>The lower mass detection limit of the method is usually 15 μg to 30 μg of deposited mass per square centimetre of</p>
<p>surface area, <i>S</i>, of the filter. This means, for a sampling time <i>t </i>of 3 h and a flowrate <i>q </i>of 1 m3/h, that the</p>
<p>concentration detection limit ranges between 5 μg/m3 and 10 μg/m3, computed as follows:</p>
<p/>
<p>Sampling techniques are not included in the scope of this International Standard.</p>
<p>NOTE The concentration of particulate matter is calculated by dividing the mass deposited on a filter tape or individual</p>
<p>filter, by the known volume of air sampled. However, concentration is dependent on the sampling technique used, for example,</p>
<p>the design of the sampling inlet. Normally, for ambient-air particle sampling, large particles are filtered out by means of a sizeselective</p>
<p>inlet (for example cascade impactor or cyclone filtration). The particle size limit is defined by the characteristics of the</p>
<p>sampling head.</p>
Registration number (WIID)
32943
Scope
<p>This International Standard describes a method for the measurement of the mass of particulate matter in ambient</p>
<p>air and is based on the absorption of beta rays by the particulate matter.</p>
<p>This method applies to the determination of concentrations ranging from a few micrograms per cubic metre to a few</p>
<p>milligrams per cubic metre contained in the atmospheres of urban, rural or industrial areas.</p>
<p>The lower mass detection limit of the method is usually 15 μg to 30 μg of deposited mass per square centimetre of</p>
<p>surface area, <i>S</i>, of the filter. This means, for a sampling time <i>t </i>of 3 h and a flowrate <i>q </i>of 1 m3/h, that the</p>
<p>concentration detection limit ranges between 5 μg/m3 and 10 μg/m3, computed as follows:</p>
<p/>
<p>Sampling techniques are not included in the scope of this International Standard.</p>
<p>NOTE The concentration of particulate matter is calculated by dividing the mass deposited on a filter tape or individual</p>
<p>filter, by the known volume of air sampled. However, concentration is dependent on the sampling technique used, for example,</p>
<p>the design of the sampling inlet. Normally, for ambient-air particle sampling, large particles are filtered out by means of a sizeselective</p>
<p>inlet (for example cascade impactor or cyclone filtration). The particle size limit is defined by the characteristics of the</p>
<p>sampling head.</p>
