Absorption or storage of the component to be determined

For the absorption of the component to be determined, liquid absorbents or solid adsorbents are used. The storage of the sample, mostly in a glass tube, is used less frequently. 

For a good quality sampling procedure it is desirable to achieve the most efficient and most selective absorption or adsorption of as large volume of the component to be determined as possible in the shortest possible time. 

Where absorption solutions are employed, they are contained in absorption vessels of different shapes and sizes to make the most effective 

Several types of impingers are used in different laboratories throughout the world. Some of them are named according to particular workers, such as the Polezhaev, Greenburg-Smith, Wilson and Zaitsev impingers [3, 4]. 

Absorbers with sintered glass make it possible to break up the sample into a large number of small bubbles released in the close vicinity of the moistened absorber bottom, thus providing the most efficient contact of a large number of bubbles of the air with the absorption medium. 

---