摘要
盐酸标准滴定液是各检验检测实验室最常用的标准滴定液,其标准滴定液的准确性直接影响检验检测结果,故对其不确定度的评定要求非常高。通过对盐酸标准滴定液不确定度的评定,并给出测量结果的置信度和置信区间,分析得出约0.5mol/L盐酸标准滴定液的浓度为0.5490mol/L,扩展不确定度为0.001281mol/L,相对扩展不确定度为0.2%,置信度为95%,K=2,其中显著性不确定度分量为滴定体积,其主要影响因素有滴定管的校准、滴定终点判定等因素。
Standard titration solution for hydrochloric acid is the most commonly used standard test titration in the laboratory, the accuracy of its standard titration solution directly affects the test results, so the evaluation of its uncertainty is very high. Through the evaluation of the uncertainty of standard titration solution for hydrochloric acid, and it gives the confidence and confidence interval of the measurement results, the concentration of 0.5 mol/L hydrochloric acid standard titration solution is 0. 5490 mol/L, the uncertainty of expansion is 0. 001281 mol/L, the relative expansion uncertainty is 0.2%, the confidence is 95%, K-=2, the significant uncertainty component is the titration volume, and the main influencing factors are the calibration of burette, the determination of titration end point and other factors.
出处
《中国调味品》
北大核心
2017年第12期152-157,共6页
China Condiment
关键词
盐酸
标准滴定液
标定
不确定度
评定
hydrochloric acid
standard titration solution
calibration
uncertainty
evaluation
