Development of Borax pH Solution Standard Substance
This article elaborates on the development process of borax pH solution standard substance and the evaluation method of its uncertainty in determination.Borax pH solution standard substance can be widely used in the calibration or verification of analytical instruments,periodic verification,evaluation of analytical methods,and quality control of analytical processes.The raw materials used for preparing solution standard substances are high-purity substances that have been rigorously screened.During the development process,strict uniformity and stability tests were conducted on the solution standard substance,and the results showed that the uniformity of this solution standard substance was good,with stable components within a validity period of 6 months.It uses the NIST solution standard substance as the source material for quantity traceability,and uses a high-precision pH meter for calibration.The scales,thermometers,and measuring instruments used have all been calibrated and qualified,ensuring the traceability of the quantity of this solution standard substance.The uncertainty of the recognized value has been reasonably evaluated from three aspects:fixed value,uniformity,and stability.
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