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目的:探讨气相色谱法测定云南白药酊中甲醇量测量不确定度的评估方法。方法:建立云南白药酊中甲醇量测量不确定度的数学模型,通过对检测过程中不确定度来源的分析,找出对测定结果影响较大的因素。结果:影响的最大因素是供试品溶液的进样重复性,采用气相色谱法测定云南白药酊中的甲醇含量的扩展不确定度为0.000 1%,检测结果为0.001 5%±0.000 1%。结论:不确定度评估使云南白药酊甲醇量测定的过程得到控制。
Objective: To evaluate the method for the determination of the uncertainty of measurement of methanol in Yunnan Baiyin tincture by gas chromatography. Methods: To establish a mathematical model of the uncertainty of measurement of methanol in Yunnan Baiyin tincture. By analyzing the sources of uncertainty in the detection process, we found the factors which have a great influence on the determination results. Results: The most influential factor was the repeatability of sample injection. The extended uncertainty of determination of methanol in Yunnan Baiyin tincture by gas chromatography was 0.0001%. The test result was 0.001 5% ± 0.000 1%. Conclusion: The evaluation of uncertainty makes the determination of the amount of methanol in Yunnan Baiyao tincture controlled.