关键词: font-size:medium, ">甘氨酸；电位滴定；不确定度评定；EDQM能力验证；含量测定

Abstract: Objective：To establish uncertainty evaluation for the determination of glycine by potentiometric titration, and to discuss the uncertainty component that affects the determination of glycine content. Methods：The measurement model of glycine content determination was established.The process of glycine content determination was analyzed,the uncertainty component introduced by each process was analyzed,and the uncertainty component was quantifide.Finally the uncertainty of glycine content determination was synthesized,and the standard uncertainty was given. Results:The content of glycine was 99.43%, and standard uncertainty was 0.35%, and the determination result was (99.43±0.35)%.Conclusion： The method of the uncertainty evaluation for the determination of glycine is established. The main sources of uncertainty are analyzed, which provide the reliable theoretical basis for effectively controlling of this method.It also provides a reference for the evaluation uncertainty of laboratories participating in EDQM proficiency testing.

Key words: font-size:medium, ">Glycine；Potentiometric titration； Measurement uncertainty； EDQM proficiency testing； Content determination