评定连续流动法测量烟用接装纸中六价铬的测量不确定度

Determination Uncertainty of Hexavalent Chromium of Cigarette Paper by Continuous Flow Method

摘要: 为评定连续流动法烟用接装纸中六价铬的测量不确定度，本实验分析了测量过程，修订了连续流动法烟用接装纸中六价铬的测定因果关系图，建立了测量不确定度评定的数学模型。通过对测量过程中各环节的评定，得出连续流动法烟用接装纸中六价铬测量结果的不确定度的主要来源为：样品的含水率，连续流动分析仪测定的样品浓度和测量重复性。测量结果的标准不确定度为0.12%，在95%的置信度下，取包含因子为k = 2，其扩展不确定度为0.24%。

Abstract: In order to evaluate uncertainty in hexavalent chromium of cigarette paper, a new math stereotype was set up to describe the whole process. The model was derived from analysis of hexavalent chromium measurement of cigarette paper and modified causation figure. The water content, ex-press value and repeatability were considered to be the main sources of uncertainty in hexavalent chromium of cigarette paper detection from this model. The standard uncertainty was 0.12%, the extend uncertainty (α = 0.05, k = 2) was 0.24%.