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Cigarettes. Determination of ammonia in cigarette mainstream smoke with an intense smoking regime using ion chromatography Ingestion-build-48183 BS EN 61120-5 is the1 Scope This document specifies a method for the quantification of ammonia by ion chromatography in mainstream smoke using ISO 20778 smoking parameters. This method is applicable to an ammonia yield of about 10 g cigarette to 40 g cigarette. It is not applicable for the determination of ammonia in dark air cured cigarettes.