BS ISO 23920:2020,Cigarettes – Determination of ammonia in cigarette mainstream smoke with an intense smoking regime using ion chromatography.BS ISO 23920:2020 pdf free download.
BS ISO 23920:2020 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 ug/cigarette to 40 ug/cigarette. It is not applicable for the determination of ammonia in dark-air cured cigarettes.
2 Normative references
ISO 3402, Tobacco and tobacco products – Atmosphere for conditioning and testing;
ISO 8243, Cigarettes – Sampling.
ISO 20778, igarettes – Routine analytical cigarette smoking machine – Definitions and standard conditions with an intense smoking regime.
ISO 20779, Cigarettes – Generation and collection of total particulate matter using a routine analytical
ting machine with an intense smoking regime.
4 Principle
Ammonia is collected by passing the mainstream smoke of cigarettes with intense smoking regime through either:
a) a glass fibre filter pad as specified in 1S0 20779 (e.g. Cambridge filter pad, CFP3) followed by impinger traps containing dilute sulphuric acid (trapping system 1 in this document),or
b) an impregnated glass fibre filter pad followed by an untreated glass fibre filter pad (trapping system 2 in this document).

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