花生仁水分测量结果的不确定度分析

Analysis of the Uncertainty of Determination of Moisture Content in Peanut Kernels

对直接干燥法测定花生仁水分的不确定度进行评估。测量过程中的不确定度主要来源有称样皿质量、干燥前试样及称样皿质量、干燥后试样及称样皿质量和重复性。对各不确定度分量进行计算,最终合成标准不确定度和扩展不确定度。按95%置信区间,取包含因子k=2时,花生仁水分的扩展不确定度为0.10%。

An analytical method to determine moisture content in peanut kernels is presented by direct drying method,and the method for the uncertainty measurement is evaluated. The main sources of uncertainty include the weight of the sample pan, the sample and the sample pan before drying, the sample and the sample pan after drying, and the repeatability. The combined standard uncertainty is obtained by combining all standard uncertainty, then the expanded uncertainty is calculated by using a coverage factor k=2 （gives a level of confidence of approximately 95 %）. The expanded uncertainty is 0.10%.