Evaluation of Uncertainty in Determination of Lithium Ions in Water by Ion Chromatography
Ion chromatography is one of the detection methods for lithium ions in water,the accuracy of the measurement results is affected by many factors.In order to reduce the error and improve the detection accuracy,it is particularly important to evaluate the uncertainty of ion chromatography for the determination of lithium ions.In this study,the accuracy of lithium ion determination in water was systematically evaluated from four aspects:repeatability measurement,standard solution configuration process,linear regression analysis of standard curve,and ion chromatography instrument.According to the established standard,the uncertainty of each component was calculated independently,and the overall composite uncertainty and extended uncertainty index were obtained through calculation.The results showed that the synthetic relative standard uncertainty of the lithium ion concentration in water obtained by this method was 0.009 3,and the corresponding extended uncertainty was 0.019 mg/L.And the two uncertainty components that have the greatest influence on the synthetic relative standard uncertainty were the preparation process of standard solution and the ion chromatography instrument.
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