基准邻苯二甲酸氢钾标定NaOH标准溶液的不确定度评定

对实验室自配的1 mol/L NaOH标准滴定溶液的浓度进行不确定度评定,建立不确定度评定程序和方法,并依据GB/T601-2002建立数学模型.确定了影响NaOH标准滴定溶液浓度的主要因素,归纳了不确定度的主要来源,建立了用基准试剂标定标准滴定溶液浓度的不确定度评定程序和方法.当NaOH标准滴定溶液浓度为1.0201 mol/L时,扩展不确定度为0.0040 mol/L.该程序和方法适用于同类型实验的不确定度评定.

UNCERTAINTY EVALUATION FOR CALIBRATION OF STANDARD SOLUTION CONCENTRATION OF SODIUM HYDROXIDE BY FIDUCIAL POTASSIUM HYDROGEN PHTHALATE

Uncertainty for 1 mol/L standard solution concentration of sodium hydroxide prepared in the laboratory was evaluated. The procedure and method to evaluate the uncertainty were established. Based on GB/T 601 -2002, the mathematical model synthesizing uncertainty were established. The primary factors influencing the concentration of sodium hydroxide titrating solution were confirmed. The main origin of the evaluation uncertainty with the fiducial reagent to calibrate the concentration of standard solution were found. When the concentration of sodium hydroxide standard solution was 1. 020 1 mol/L, the expanded uncertainty was 0. 004 0 mol/L. The procedure and method of evaluation are useful to uncertainty evaluation in the similar experiments.