Measuring range: 0.100%-12.00%. The sample was dissolved in hydrochloric acid, and magnesium in the residue was recovered by filtration. In the presence of hydrogen peroxide, potassium cyanide and a small amount of iron, magnesium is precipitated with sodium hydroxide and separated from a large amount of aluminum, zinc, copper, nickel and chromium. The precipitate was dissolved in hydrochloric acid, and a small amount of iron, manganese, aluminum and titanium were separated by precipitation with zinc oxide in the presence of potassium permanganate. The test solution is methyl thymol blue as an indicator. Magnesium is titrated with a CDTA standard solution.
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