What is an impinger used for?

An impinger is specifically designed to collect airborne particles, typically aerosols, by directing them into a liquid medium. When air containing these aerosol particles flows through the impinger, the particles collide with the surface of the liquid, leading to their capture. This mechanism is fundamental in various fields, including air quality monitoring and microbiological sampling, as it allows for the assessment of particles present in the air, including contaminants and biological organisms.

The other options presented do not accurately describe the primary function of an impinger. For instance, measuring the flow of wastewater falls under the realm of flow meters, while testing soil absorption capacity involves methods specific to soil analysis. Checking chlorine residuals pertains to water quality testing procedures rather than airborne particulate measurement. The distinct role of an impinger in collecting aerosol particles makes it an essential tool for environmental monitoring and analysis.