Titration standards are a critical component of the moisture analysis pipeline. They ensure that all measurements can be traced to the NIST reference materials and all results can be directly compared to each other. The chain of traceability guarantees that all results and corresponding moisture level requirements operate in the same frame of reference.
Standards are used for calibration of titration equipment and for determining titer of volumetric reagents. Since the titer can decrease with time, it’s important to measure the correct value before a series of analyses to make sure the results are correct.
Quveon manufactures two types of standards: liquid water standards packaged in glass ampules and solid standards based on sodium tartrate dihydrate.
Liquid water standards
Liquid standards are solutions of water in a common solvent with a known water concentration. Depending on the specific application, different concentrations are used.
Water Standard 10.0 contains 10 mg of water per 1 g of solution (1% water concentration). It’s typically used for determining titer of volumetric reagents for titration of samples with high water content.
Water Standard 1.0 contains 1 mg of water per 1 g of solution (0.1% water concentration). Its main applications are in titer determination and in calibration of coulometric instrumentation.
Water Standard 0.1 contains 0.1 mg of water per 1 g of solution (0.01% water concentration). This standard has the lowest water content at 100 ppm and is primarily used for calibrating coulometric titrators for analysis of low water content. The typical applications are in the fuel and petrochemical industry.
Sodium tartrate dihydrate
Sodium tartrate dihydrate is a crystallohydrate with a very stable water content at ~15.66% by mass. Water standard based on sodium tartrate dihydrate is used in volumetric titration for titer determination.
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