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Table 1 Comparison of ammonia in 3R4F tobacco filler by study

From: Spectrophotometric determination of ammonia levels in tobacco fillers of and sidestream smoke from different cigarette brands in Japan

Method Study reference 3R4F ammonia (mg/g)
IC Watson et al. 2015 1.1 ± 0.14
Jansen et al. 2014 1.07 ± 0.015
CORESTA 2015 1.08 ± 0.10
Current study 1.12 ± 0.12
Colorimetric method Current study 1.22 ± 0.08