烘箱温度和干燥时间对烟丝水分检测结果的影响

Effects of Oven Drying Temperature and Time on Moisture Content Determination in Cut Tobacco

为了考察烘箱温度和烘箱干燥时间对烟丝水分结果的影响及与卡尔费休法水分的关系,采用烘箱法对不同的样品量、烘箱温度及烘箱干燥时间对烟丝水分结果的影响进行测定,结果表明:1在试验范围内,随着样品量的增加,烟丝水分检测结果标准偏差逐减小;2烟丝水分检测结果与烘箱温度、烘箱干燥时间的自然对数及卡尔费休法水分成线性关系;3当样品表观水分与卡尔费休法水分相等时,烘箱温度及其对应烘箱干燥时间存在一定的关系;利用该关系可以快捷准确检测烟丝水分,极大减少检测时间。

In order to investigate the effects of oven temperature and oven drying time on cut tobacco moisture content determination and develop an equation related the apparent moisture content determined using a given oven temperature and time to the standard moisture by the Karl Fischer method, the variability in moisture content determination attributed to sample weight, sample location in the oven, oven temperature and drying time was experimented, compared and analyzed. The results showed that：（I） Within the test range, the standard deviation of the measured moisture content in cut tobacco decreased with the increase of test sample weight;（II） The moisture content of cut tobacco was linearly related to the oven temperature, the logarithm of oven drying time and the standard moisture by the Karl Fischer method;（III） There were some relationships between the oven temperature and the oven drying time when the apparent moisture content was equal to the standard moisture by the Karl Fischer method. This relationship could be used as the basis for rapid moisture content determination of cut tobacco using high temperature, short time oven method, the testing time had been greatly reduced.