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Indian Scientific Instrument

Air Sampling

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Air sampling is the process of determining the contaminant in a certain volume of air, measuring the amount of contaminant, and presenting it as a concentration. For conducting air sampling, the air is made to pass through a filter medium such as a paper for solid contaminants and a sorbent for gases. The volume of air is measured with respect to the amount of contaminant captured, thereby yielding the concentration, which is commonly expressed as parts per million (ppm).

The volume of air is taken as the multiplicative product of the flow rate through the filter medium and the time expressed in minutes. Calibration of the flow rate is prerequisite and should be carried out before and after each sample is taken.

The most common method involved in the process is to connect a battery operated pump to a filter medium. The pump should be efficient enough to draw air through the filter at an unchanged rate for a time in excess of 8 hours.

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