There is the testing approach of AR grade magnesium oxide:
In the first place, some indexes need to be tested: content, clarity, insoluble matter in hydrochloric acid, hydrotrope, loss on ignition, chloride, sulfate, phosphate, total ammonia, carbonate and other impurities. These impurities include sodium, kalium, calcium, iron, copper, arsenic, zinc, barium, strontium and other heavy metal products.
All of the above materials is some indexes need to be tested. The different test of indexes have different test methods. For example, the determination of magnesium oxide content. First of, some sample is weighted. And then, add a little water to moist the sample. Add hydrochloric acid dropwise until the sample dissolved in full. Moving some of it to volumetric flask. Dilute it to the scale, take proper sample to use ammonium hydroxide and chrome black T . And then, titrate with disodium edta solution until become pure blue from amaranth. Finally, count it according to the computational formula of magnesium oxide content.
The test of other indexes is similar to the test of content. The two both need to take some sample, and are counted through different methods and different computational formulas.
Above is the suggestions from Meishen, a professional magnesium oxide manufacturer. If you want to know know more, welcome to call or visit us!