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.
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