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Description
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Colourless crystals or a white powder; slightly. hygroscopic in moist air
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Solubility
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Very soluble in water; freely soluble in ethanol (95%); sparingly soluble in ether
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Identification 'A' ( by IR)
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The infrared absorption spectrum of the sample should be concordant to that of the standard
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Identification 'B'
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It should gives the reaction (A) of citrate
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Identification 'C'
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Solution should be strongly acidic
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Appearance of solution
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The solution should clear, and not more intensely coloured than reference solution YS7, BYS7 or GYS7
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Arsenic
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NMT 1 ppm
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Barium
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Any opalescence produced should not more intense than that of a mixture of 5 ml of solution A and 5 ml of distilled water
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Calcium (Ca)
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NMT 200 ppm
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Iron
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NMT 50 ppm
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Chlorides
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NMT 50 ppm
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Sulphates
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NMT 150 ppm
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Oxalic acid
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Any pink colour produced should not more intense than that produced by carrying out the test using 0.2 mg of oxalic acid dissolved in 4 ml of water
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Readily carbonisable substance
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Any colour produced should not more intense than that of a mixture of 1.0 ml of CCS and 9.0 ml of FCS
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Sulphated ash
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NMT 0.1%
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Water
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NMT 1.0%
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Assay (on anhydrous basis)
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99.0 – 101.0%
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