Evaluation of Uncertainty for the Determination of Proficiency Testing Samples by the Potentiometric Titration
Objective To evaluate the uncertainty for the determination of proficiency testing samples by potentiometric titration,and to investigate the uncertainty components affecting the evaluation.Methods Potentiometric titration was used to determine the content of asparagine monohydrate and aspartic acid.The evaluation model was established to analyze the sources of uncertainty,and calculate the relative standard uncertainty of sub-scales and the composite uncertainty of two samples.Results The content of asparagine monohydrate was 87.53％,and the combined standard uncertainty was 0.24％.The content of aspartic acid was 99.68％,and the combined standard uncertainty was 0.22％.Conclusion The method of the uncertainty evaluation for the determination of proficiency testing samples is established,and the results of the proficiency testing are satisfied,which can provide a support for the credibility of the results of the content determination of proficiency testing samples.
万方数据
维普
