Which method is used for ammonia sampling?

The correct choice applies a method that effectively captures ammonia in a manner that allows for subsequent analysis. In this case, the use of a silica gel tube treated with sulfuric acid is specifically designed to absorb ammonia. When ammonia is present, it reacts with the sulfuric acid to form ammonium sulfate, which is a compound that can be easily analyzed in a laboratory setting.

After collection, the sample can be analyzed using ion chromatography, which is a powerful technique for separating and quantifying ionic species. Ion chromatography provides high sensitivity and can detect ammonium ions with great precision, making it ideal for environmental monitoring of ammonia levels.

This method is preferred in industrial hygiene and environmental health for ammonia sampling due to its reliability and the ability to handle potentially high concentrations of this gas. This makes it a standard practice in monitoring air quality and ensuring compliance with safety regulations regarding exposure levels.