Question
Name any two methods that are used for collecting gaseous samples and explain any one of these.
Answer :
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Gaseous samples in environmental studies are commonly collected by methods such as absorption in liquids and adsorption on solid sorbents. Another frequently used approach is grab sampling using evacuated flasks or sampling bags. Among these, absorption in liquids is a widely applied and reliable method for collecting and analyzing gaseous pollutants. In the absorption method, a known volume of air is passed through a suitable liquid absorbent that selectively dissolves or reacts with the target gas. The apparatus generally consists of an air pump, flow controller, and absorption bottles or impingers containing
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