顶空-气相色谱法测定饮用水中三氯乙醛的不确定度评定

Evaluation of uncertainty of determination of trichloroaldehyde in drinking water by headspace gas chromatography

中文关键词:  顶空-气相色谱法  饮用水  三氯乙醛  不确定度

英文关键词:headspace gas chromatography  drinking water  trichloroaldehyde  uncertainty

中文摘要:

      目的 分析顶空-气相色谱法测定饮用水中三氯乙醛的不确定度。方法 分析标准溶液的配制、样品测定重复性和拟合标准曲线等影响测量结果的不确定度分量, 并计算合成不确定度和扩展不确定度。 结果 当水中三氯乙醛的测量结果为3.27 μg/L, 取包含因子k=2(置信水平约95%)时, 扩展不确定度U= 0.36 μg/L。结论 顶空-气相色谱法测定饮用水的不确定分量中影响最大的是配制标准溶液过程引入的不确定度, 标准曲线拟合和样品测量重复性次之。

英文摘要:

      Objective To evaluate the uncertainty of determination of trichloroaldehyde in drinking water by headspace gas chromatography. Methods The uncertainty of the measurement results, such as the preparation of the standard solution, and the repeatability of the sample measurement and the fitting of the standard curve were analyzed, and the synthetic uncertainty and the extended uncertainty were calculated. Results When the measurement result of trichloroacetaldehyde in water was 3.27 μg/L, and the inclusion factor k=2 (confidence level was about 95%), the expansion uncertainty U=0.36 μg/L. Conclusion The most influential factor of the uncertainty component in the determination of drinking water by headspace-gas chromatography is the uncertainty introduced by the standard solution preparation, the standard curve fitting and sample measurement repeatability are next.