CHEN Wei-hua, BAO Feng-wei, ZHANG Xiao-jing, SU Guo-sui

Technical Center of China Tobacco Hebei Industrial Corporation , Shijiazhuang 050051, China

Abstract: Tobacco samples are digested by a HNO₃-H₂O₂ system in a closed microwave digestion instrument, and are then determined by the continuous flow analysis . A method of quantitative analysis of potassium in flue-cured tobacco has been established. The results showed that the recoveries were between 99.47%～100.08% and the relative standard deviations were lower than 2%.The results were in agreement with certified values with a relative error of 1.19%. As compared with the sulfuric acid atmosphereric pressure digestion method, this method can determine the contents of potassium in flue-cured tobacco accurately and rapidly.

Key words: microwave digestion; continuous flow method; flue-cured tobacco; flame photometer;potassium

E-mail: cwhlzwd@163.com

Analysis and Testing Technology and Instruments, Vol. 16, No. 2, 2010, 120-122.