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Appearance
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Colorless hygroscopic crystals with faint odor
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Assay
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Min 98%
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Insoluble matter (10% in water)
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Max 0.005%
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pH (5% solution; 25°C)
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pH 6.7-7.3
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Phosphate (PO4)
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Max 0.0005%
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Chloride (Cl)
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Max 0.0005%
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Nitrate (NO3)
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Max 0.001%
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Sulphate (SO4)
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Max 0.001%
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Iron (Fe)
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Max 0.0005%
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Heavy metal (as Pb)
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Max 0.0005%
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Residue on ignition (as ash)
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Max 0.01%
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Reducing substances by KMnO4 (as O)
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Max 0.005%
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Water (H2O)
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Max 2.0%
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