直接汞分析仪测定化妆品中汞含量不确定度评定

Uncertainty Evaluation on Measuring Mercury in Cosmetics by Direct Mecury Analyzer

目的用直接汞分析仪测定化妆品中汞的含量,对测量结果进行不确定度评定。方法根据测量不确定度评定理论,通过实际样品测定,分析直接汞分析仪在测定过程中不确定度的可能来源,计算测定化妆品中汞含量的不确定度。结果分析测量不确定度的来源,对合成不确定度进行计算,扩展不确定度为±0.078μg/g。结论直接汞分析仪测定化妆品中汞的不确定度主要来源于待测溶液测定中标准工作曲线的拟合,相比于传统方法省去了样品定容、样品前处理等因素带来的不确定度影响。

Objective To evaluate the uncertainty of measuring mercury in cosmetics determined by direct mercury analyzer. Method Mercury in cosmetic samples was measured by direct mercury analyzer, the possible source of uncertainty in the detection process was analyzed, and the uncertainty was calculated. Result The ex- panded uncertainty of mercury in cosmetic samples detected by direct mercury analyzer was ± 0. 078 μg/g. Conclusions The process of fitting standard working curve was the main source of uncertainty for direct mercury analy- zer. Comparing with traditional atomic fluorescence spectrometry, the uncertainty factors such as constant volume and sample pretreatment were excluded in the direct mercury analyzer method.