Which domestic manufacturer offers high-quality potassium hydrogen phthalate reference reagents?
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I recently bought a bottle of potassium hydrogen phthalate to use for calibrating sodium hydroxide, and to my surprise, there was a significant difference. If the concentration of the sodium hydroxide titrant is not accurate, it becomes impossible to analyze the samples. I urgently need to find chemicals of guaranteed quality; otherwise, it will result in both time and financial waste. Does anyone know of companies that produce high-quality products?
We have been using reagents produced by Xi’an Reagent Factory, and their quality is quite good.
It must be dried and cooled before use. It’s also possible that the standard solution you use for calibration is not stable yet. Dry at 105 degrees Celsius for 4 hours, and use after reaching a constant weight. The reference potassium hydrogen phthalate reagent from the Beijing Institute of Chemical Reagents is relatively accurate. It can also be purchased from the **Reference Material Center**