离子选择电极分析法测定尿氟的不确定度评定

Evaluating the uncertainty in urinary fluoride measurement by ion selective electrode method

目的进行尿氟测定结果不确定度的评定，为检测工作提供质量保证。方法根据测量不确定度的评定原理和测定方法来进行评定，并对测定结果进行完整描述。结果方法的合成标准不确定度为2．86％，对于尿氟含量为4．47mg／L的样品，其扩展不确定度为0．26mg／L。结论该法的不确定度主要来源于样品的重复性、标准溶液的配制、标准工作曲线线性及离子分析仪等方面。

Objective To evaluate the uncertainty of measurement result of urinary fluoride and to provide quality assurance for determinations. Method The investigation was conducted, according with principles and methods for uncertainty evaluation. Results The uncertainty of the combined standard of present method was 2.86 %. For the sample containing 4.47 mg/L urinary fluoride, the expanded uncertainty was 0.26 mg/L. Conclusion The uncertainty of the present method was mainly from the sample repeatability, the preparation of standard solution, the linearity of the calibration curve and instruments and so on.