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Updated: Aug 26, 2025
Determination of Inorganic Arsenic in a Wide Range of Food Matrices using Hydride Generation - Atomic Absorption Spectrometry.
Published on: September 1, 2017
[Interlaboratory comparison for determination of arsenic in drinking water]
Yan Liu1, Jiaolan Yang2, Zizheng Liu2
1Chinese Center for Disease Control and Prevention, Beijing 102206, China.
Objective:
To analyze and evaluate the testing capability of arsenic in drinking water in the laboratories of the provincial and municipal centers for disease control and prevention across the country by implementing the interlaboratory comparison project.
Methods:
The preparation method of the secondary standard materials were used as the reference for the sample preparation in the interlaboratory comparison project. The homogeneity and stability of the samples and short-term stability for simulated transportation were tested by single factor analysis of variance(ANOVA) and linear regression and mean consistency test(t test). On top of using the kernel density estimation to test the distribution of laboratory test result, we adopted precision statistical method to analyze the laboratory test result and used Z-score to evaluate the testing ability of each participating laboratory.
Results:
A total of 411 laboratories throughout the country participated in the proficiency testing program.389 laboratories(94.6%) of participating laboratories, obtained satisfactory result. Results provided by 2 laboratories(0.5%) of total participating laboratories, were found suspicious in their capacities. Finally, there were 20 laboratories(4.9%) of total participating laboratories, with result found to be outliers.
Conclusion:
The testing capability of arsenic in drinking water has been ranked as satisfactory in the laboratories of the provincial and municipal centers for disease control and prevention across the country, and the testing capability of a small number of laboratories requires further improvement.
