酸碱指示剂滴定法测定水质酸度的不确定度评估
Assessment of Uncertainty in the Determination of Water Acidity by Titration with Acid-Base Indicators
王雪丹1
作者信息
- 1. 万子健检测技术(上海)有限公司(上海 201815)
- 折叠
摘要
为提高酸碱指示剂滴定法测定水质酸度结果的准确性,根据CNAS-GL006:2019《化学分析中不确定度的评估指南》、JJF 1059.1-2012《测量不确定度评定与表示》及第 1 号修改单,分析了各种不确定度来源,在规定的测量条件下,计算其测量不确定度.对标准品纯度、移液器、常用玻璃仪器、滴定过程及重复性进行了不确定度评估,发现滴定过程的不确定度和重复测定产生的不确定度是影响结果的主要因素.
Abstract
In order to improve the accuracy of the results of acid-base indicator titration method for the determination of water acidity,various sources of uncertainty were analyzed,and their measurement uncertainties were calculated under the specified measurement conditions according to the CNAS-GL006:2019"Guidance on Quantifying Uncertainty in Chemical Analysis"and JJF 1059.1-2012"Evaluation and Expression of Uncertainty in Measurement"and the Revision Sheet No.1.The uncertainty in the purity of standards,pipettes,common glass instrument,titration process and repro-ducibility were evaluated.It was found that the uncertainty in the titration process and the uncertainty caused by repeated measurements were the main factors affecting the results.
关键词
酸碱指示剂滴定法/测量/酸度/不确定度Key words
Acid-base indicator titration/Measure/Acidity/Uncertainty引用本文复制引用
出版年
2024
NETL
NSTL
万方数据