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Description
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Colourless crystals or a white, crystalline powder.
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Identification
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The solution gives the reactions of potassium salts and of chlorides
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Appearance of solution
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Solution should be Clear and colorless
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Acidity or alkalinity
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Not more than 0.5 ml of 0.01 M sodium hydroxide or 0.01 M hydrochloric acid for neutralisation to bromothymol blue solution
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Arsenic
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NMT 1 ppm
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Barium
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Solution is not more opalescent than a mixture of 5 ml of solution A and 6 ml of water.
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Heavy metals
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NMT 10 ppm
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Calcium & magnesium
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The solution remains clear
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Iron
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NMT 20 ppm
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Bromides
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NMT 0.1%
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Iodides
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The substance shows no blue colour after 5 minutes.
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Sulphates
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NMT 300 ppm
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Loss on drying
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NMT 1.0%
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Assay (on dried basis)
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99.0 – 100.5%
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Aluminium
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NMT 1 ppm
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Sodium
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NMT 0.1 %
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