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Magnesium peroxide (MgO2) is an odorless fine powder peroxide with a white to off-white color.
General Specifications of Magnesium Peroxide
Composition: MgO2
Magnesium Peroxide 35% to 40%
Calcium: 0.85%
Chloride Cl: 0.030%
Sulphate SO4: 0.3%
Heavy metals (As Pb): 0.003%
pH: 10
Moisture: 2%
Appearance: Light yellow to white fine powder
Magnesium Peroxide BP Grade
Ph Eur
DEFINITION
Mixture of magnesium peroxide and magnesium oxide.
Content: 22.0 per cent to 28.0 per cent of MgO2.
CHARACTERS
Appearance: White or slightly yellow, amorphous, light powder.
Solubility: Practically insoluble in water and in ethanol (96 per cent). It dissolves in dilute mineral acids.
IDENTIFICATION
A. Dissolve about 15 mg in 2 mL of dilute nitric acid and neutralise with dilute sodium hydroxide solution. The solution gives the reaction of magnesium.
B. Dissolve 0.1 g in 2 mL of dilute sulfuric acid and dilute to 10 mL with water. Shake 1 mL of this solution with 5 mL of ether and 0.5 mL of potassium dichromate solution. The ether layer is blue.
TESTS
Solution S1: Dissolve cautiously 5.0 g in 40 mL of hydrochloric acid. Cautiously evaporate the solution to 10 mL and dilute to 100 mL with a mixture of equal volumes of acetic acid and distilled water. Filter, if necessary, through a previously ignited and tared porcelain or silica filter crucible of suitable porosity to give a clear filtrate. Keep the residue for the test for acid insoluble substances.
Solution S2: Dilute 5 mL of solution S1 to 25 mL with distilled water R.
Appearance of solution: Solution S1 is not more intensely coloured than reference solution.
Acidity or alkalinity: To 2.0 g add 100 mL of carbon dioxide-free water and heat to boiling for 5 min. Filter whilst hot through a sintered-glass filter, allow to cool and dilute to 100 mL with carbon dioxide-free water. To 15 mL of the filtrate, add 0.1 mL of phenolphthalein solution. The solution is red. Not more than 0.2 mL of 0.1 M hydrochloric acid is necessary to change the colour of the indicator. Keep the filtrate for the test for soluble substances.
Acid insoluble substances: Maximum 0.1 per cent.
Soluble substances: Maximum 1.5 per cent.
Chlorides: Maximum 0.1 per cent.
Sulfates: Maximum 0.5 per cent.
Arsenic: Maximum 4 ppm, determined on 5 mL of solution S1.
Calcium: Maximum 1.0 per cent.
Iron: Maximum 500 ppm.
Heavy metals: Maximum 30 ppm.
ASSAY
Dissolve 80.0 mg, shaking cautiously, in a mixture, previously cooled to 20C, of 10 mL of sulfuric acid and 90 mL of water. Titrate with 0.02 M potassium permanganate until a pink colour is obtained.
1 mL of 0.02 M potassium permanganate is equivalent to 2.815 mg of MgO2.
STORAGE
Protected from light
For Original Monographs of IP Indian Pharmacopoeia BP British Pharmacopoeia USP US Pharmacopoeia FCC Food Grade product, please check with the respective web-pages or books.