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A simple and rapid method for determination of atmospheric ammonia has been investigated. The method is based on preconcentration with alkalized Porasil A and on analysis with a chemiluminescent nitrogen detector-gas chromatography(CLD-GC). Collection on and thermal release from the adsorbent are almost quantitative. From temperature dependence of retention volumes, it is possible to make a sampling of 5 liters at 20 °C, which allows to determine 10 ppb of ammonia in air. Results with the present method are in good agreement with those by the acid collection and the Indophenol method.

Determination of atmospheric ammonia by alkalized porous silica beads collection and chemiluminescent nitrogen detector - gas chromatography.