用银盐法测定化妆品中砷含量的不确定度

Assessment of uncertainty of arsenic content of cosmetic by silver salt law

本文分析了二乙氨基二硫代甲酸银(DCC-Ag)分光光度法测定化妆品中的砷含量的误差来源,对最终结果进行不确定度评估证实方法的总扩展不确定度为0.69mg/kg(包含因子k=2),其中重复性测定偏差为不确定度的主要来源。因此测量中严格掌握样品的处理过程是保证测量精度的重要手段。

We analyzed error of determining content of arsenic by luminosity of DCC-Ag in cosmetic. Including standard curve , parallelism of lest result,quantify of sample,and so on.The last result indicated that extend uncertainty of mensuration of assess is 0.69mg/kg, contain gene is two , and the uncertainty of mensuration of our test result depend on mostly the error of repeating mensuration. So the process of treating sample is very important.