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Appearance
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Large, colourless crystals or coarse crystalline powder
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Assay (iodometric)
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99.5 - 101.0%
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Insoluble matter (10% in water)
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Max. 0.005%
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pH (5% solution in water; 25°C)
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6.0 - 8.4
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Nitrogen compounds (as N)
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Max. 0.002%
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Chloride (Cl)
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Max. 0.02%
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Heavy metal (as Pb)
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Max. 0.001%
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Sulphate and Sulphite (as SO4)
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Max. 0.1%
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Sulphide (S)
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Passes test
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