BS ISO 13276:2020 pdf free.Tobacco and tobacco products - Determination of nicotine purity - - Gravimetric method using tungstosilicic acid. BS ISO 13276 A suitable amount of replicates should be measured. Weigh, to the nearest 0,000 1 g。approximately 0,1 g of the nicotine alkaloid (or the equivalent amount of nicotine salt) (m) in each of, for example, five 250 ml...