Impinging

Impingement is defined as collision of turbulent atmospheric motions of a small, airborne particle with a surface, usually not at right angles to the mean direction of flow. Liquid impingement results when the air stream is diverted into a liquid, which retains the particles as the air bubbles to the surface.

Many methods are used within such samplers for collecting the material of interest from the air stream. These methods include filtration, impaction, electrostatic and thermal precipitation and liquid impingement.

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