对分析仪器两点线性校准引入不确定度的探讨

Uncertainty evaluation of analytical instrument caused by two-point linear calibration

两点线性校准是分析仪器常用的校准方法,该校准过程所引入的不确定度是仪器测量结果不确定度的组成部分。但是对于两点线性校准引入的不确定度,却未见有文献进行过评定或分析。本文在两点校准原理的基础上,通过详细的数学推导,分析了各参数对测量结果不确定度的影响,发现响应值y引入的不确定度对测量结果的不确定度没有贡献,两点线性校准的过程是将标准溶液x的不确定度按一定规律传递给被测对象。

In this paper ,w e discuss the uncertainty of the measuring results introduced by the tw o‐point linear calibration. It is found that the uncertainty of response intensity exerts no effect on the uncer‐tainty of the measuring results. In comparison ,the uncertainty caused by two‐point linear calibration is mainly introduced by the uncertainty of the two standard solutions used in calibration according to specific regulation.