密度瓶法测定糯米酒中酒精度的不确定度评定
目的 评定密度瓶法测定糯米酒中酒精度的不确定度。方法 分析测定过程中不确定度的来源; 通过统计方法从测量重复性、温度计读数偏移、密度瓶校准、容量瓶的容量允差和天平校准等方面计算各分量的标准不确定度; 最后计算合成不确定度和扩展不确定度。结果 当糯米酒的酒精度为13.65 %vol时, 扩展不确定度U=0.11 %vol (k=2)。结论 密度瓶法测定糯米酒中酒精度过程中, 密度瓶校准的不确定度分量所带来的影响最大, 是该方法不确定度的主要来源; 其次是是测量重复性; 读数偏移、容量允差、天平称量的误差等对其测定不确定度的影响较小。
Objective To evaluate the uncertainty for determination of alcohol degree in glutinous rice wine by pycnometer method. Methods The sources of uncertainty were determined by analyzing the measurement process. The standard uncertainty of each component was calculated from the aspects of measuring repeatability, thermometer reading deviation, density bottle calibration, volumetric flask capacity tolerance and balance calibration. Finally, the synthetic uncertainty and the extended uncertainty were calculated. Results When the alcohol of glutinous rice wine was 13.65 %vol, the expansion uncertainty U=0.11 %vol (k=2). Conclusion During the determination of alcohol degree in glutinous rice wine by pycnometer method, the uncertainty component of pycnometer calibration has the greatest influence and is the main source of uncertainty. The second is measurement repeatability. The influences of reading deviation, capacity tolerance and balance calibration on the measurement uncertainty are small.
标题：密度瓶法测定糯米酒中酒精度的不确定度评定
英文标题：Uncertainty evaluation for determination of alcohol degree in glutinous rice wine by pycnometer method
作者：
符郁馥 海南省食品检验检测中心
刘冬妮 海南省食品检验检测中心
周玉玲 海南省食品检验检测中心
林志藩 海南省食品检验检测中心
中文关键词:密度瓶法,酒精度,不确定度,评定,
英文关键词:pycnometer method,alcohol degree,uncertainty,evaluation,
发表日期：2019-03-22
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