卡尔费休法快速测定烟用香精中的水分含量

Rapid Determination on the Water Content in Tobacco Essence by Karl Fischer Method

［目的］建立卡尔费休法快速分析烟用香精中水分。［方法］经自动预滴定和卡式试剂的标定后，采用卡氏试剂对4种烟用香精中的水分含量进行滴定，并滴定环境中的水分以消除背景干扰。同时根据加标前的测定量、加标量和加标后的测定量计算回收率。对烟用香精进行6次平行测定，并根据测定结果计算相对标准偏差。［结果］卡尔费休法对烟用香精中水分分析结果理想，相对标准偏差在1.65%～2.54%，回收率为93.46%～106.15%。采用该法对4种烟用香精水分进行测定表明，不同香精的水分含量有明显差别，水分含量在1.49%～5.74%，结果满意。［结论］用卡尔费休法分析烟用香精中的水分具有灵敏、准确性高、重复性好的特点，为烟用香精中的水分测定提供一种参考。

[ Objective ] The study aimed to establish the rapid analysis method to determine water in tobacco essence by Karl Fischer method. [ Method ] After automatic pre-titration and calibration with cassette reagent, the moisture contents in 4 kinds of tobacco essence were tltrated by cassette reagent, and the moisture content in environment was titrated in order to eliminate background interference. At the same time, the recovery rate was calculated according to measured quantity before adding standard, adding standard and measured quantity after adding standard. The relative standard deviation was calculated according to the determination results from 6 parallel determinations on tobacco essence. [ Result] Analysis results of determining the moisture contents in tobacco essence by using Karl Fischer method were satisfactory, with the relative standard deviation at 1.65% - 2.54% and the recovery rate of 93.46% - 106.15%. The determination on the moisture contents in tobacco essence by using Karl Fischer method showed that the moisture contents in 4 kinds of tobacco essence had great difference, which was in 1.49% -5.74% and the result was satisfactory. [ Conclusion ] Using Karl Fischer method to determine water in tobacco essence was sensitive, accurate, well repeatable, and provided a reference for determining water in tobacco essence.