Tobacco and tobacco products . determination of nicotine purity . gravimetric method using tungstosilicic acid 烟草和烟草制品.尼古丁纯度的测定.使用钨硅酸的重量分析法
2.
Tobacco and tobacco products - determination of nicotine purity - gravimetric method using tungstosilicic acid iso 13276 : 1997 烟草和烟草制品.烟碱纯度的测定.使用钨硅酸的重量分
3.
Methods for chemical analysis of tobacco and tobacco products - determination of nicotine purity gravimetric method using tungstosilicic acid 烟草和烟草制品化学分析方法.第17部分:烟碱纯度测定