滴定法测量硝酸钡含量的不确定度评定

摘要

Analysis of the influence factors and the source of sodium thiosulfate titration to measure the content of industrial barium nitrate,research the source and the influence factors of uncertainty assessment of the content of industrial barium nitrate using sodium thiosulfate titration method.The results show that uncertainty of consumption volume of standard solution titration of sodium thiosulfate in measurement of the content of industrial barium nitrate,uncertainty of quantitative removal of solution volume and uncertainty of calibration of sodium thiosulfate standard solution concentration are the main factors affecting the sodium thiosulfate titration measurement of industrial barium nitrate content results,extended by sodium thiosulfate titration measurement of industrial barium nitrate content uncertainty was 0.76％(k=2).%分析了影响硫代硫酸钠滴定法测量工业硝酸钡含量结果的因素和来源,研究了硫代硫酸钠滴定法测量工业硝酸钡含量不确定度来源及影响因素.结果表明,测量工业硝酸钡含量滴定硫代硫酸钠标液消耗体积引入的不确定度、定量移取溶液体积引入的不确定度和标定硫代硫酸钠标液浓度引入的不确定度是影响硫代硫酸钠滴定法测量工业硝酸钡含量结果的主要因素,采用硫代硫酸钠滴定法测量工业硝酸钡含量的扩展不确定度为0.76％(k=2).