气相色谱法测定白酒中氰化物的不确定度评定

Evaluation of uncertainty in determination of cyanide in liquor by gas chromatography

中文关键词:  气相色谱法  白酒  氰化物  不确定度

英文关键词:gas chromatography  liquor  cyanide  uncertainty

中文摘要:

      目的 评定气相色谱法测定白酒中氰化物的不确定度。 方法 分析气相色谱法测定白酒中氰化物的全过程, 确认不确定度的来源和大小, 合成不确定度, 计算扩展不确定度并报出结果。结果 白酒中氰化物的含量为13.8 mg/L, 扩展不确定度为1.0 mg/L(P=95%, k=2)。结论 通过对不确定度的来源分析及各分量的量化评定, 回收率与标准曲线拟合对不确定度的影响较大, 标准溶液、样品制备和测量重复性对不确定度的影响较小。

英文摘要:

      Objective To evaluate the uncertainty in determination of cyanide in liquor by gas chromatography. Methods The whole process of determination of cyanide in liquor was analyzed by gas chromatography, the source and value of uncertainty were confirmed, calculated the synthetic uncertainty was synthesized, and the extended uncertainty was calculated and the results were reported. Results The content of cyanide in liquor was 13.8 mg/L, and the expansion of uncertainty was 1.0 mg/L (P=95%, k=2). Conclusion Through the analysis of the source of uncertainty and the quantitative evaluation of each component, the recovery rate and the standard curve fitting have a great influence on the uncertainty. The standard solution, sample preparation and measurement repeatability have little effects on the uncertainty.