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Appearance
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White hygroscopic crystalline powder
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Assay (complexometric)
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99.0-105.0%
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Solubility
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Freely soluble in water, in alcohol, and in boiling alcohol; very soluble in boiling water
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Identification
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To comply USP tests
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pH (5% solution in water; 25°C)
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4.5 - 8.5
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Insoluble matter (10% in water)
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Max 0.01%
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Sulphate (SO4)
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Max 0.01%
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Ammonium (NH4)
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Max 0.005%
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Heavy metal (as Pb)
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Max 0.0005%
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Iron, aluminium & phosphate
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To comply USP test
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Barium (Ba)
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Max 0.005%
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Iron (Fe)
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Max 0.001%
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Potassium (K)
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Max 0.01%
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Magnesium (Mg)
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Max 0.01%
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Magnesium & alkali salts
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Max 0.5%
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Sodium (Na)
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Max 0.02%
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Strontium (Sr)
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Max 0.1%
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Oxidizing substances (as NO3)
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Max 0.003%
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