| Issue |
E3S Web Conf.
Volume 299, 2021
4th Annual International Conference on Energy Development and Environmental Protection (EDEP 2021)
|
|
|---|---|---|
| Article Number | 02002 | |
| Number of page(s) | 7 | |
| Section | Environmental Science and Engineering | |
| DOI | https://doi.org/10.1051/e3sconf/202129902002 | |
| Published online | 05 August 2021 | |
Evaluation of Uncertainty in Determination Methods of Seawater pH Standard Material
National Center of Ocean Standards and Metrology, Ministry of Natural Resources
* Corresponding author: tenfly04@126.com
Seawater pH standard material is determined by potentiometric methods with hydrogen electrode silver / silver chloride electrode in non-liquid junction cell. As a standard material, uncertainty is an important quality parameter. The sources of the uncertainty of determination methods mainly include measurement repeatability and temperature, atmospheric pressure, electrode potential, chloride concentration and so on. According to the experimental data, the expanded uncertainty of the method is 0.004. Finally, through in-depth analysis of the influence weight of each component, it is found that the quality control of the standard electrode potential, measurement repeatability and chloride ion concentration of the electrode in the ion system is the key to ensure the accuracy of the setting value, which provides a reliable guarantee for the replication of reference materials.
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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