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Description
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Colourless crystals or a white, crystalline powder, slightly efflorescent in warm, dry air.
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Identification
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-
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Identification 'A' ( by IR)
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The spectrum of sample should be concordant with spectrum of standard
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Identification 'B'
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It gives the reaction of citrates
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Identification 'C'
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10% w/v solution is strongly acidic
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Appearance of solution
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The solution is 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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Passes test
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Calcium
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NMT 200 ppm
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Heavy metals
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NMT 10 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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Passes test
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Readily carbonisable substance
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Any colour produced is 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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7.5 to 9.2
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Assay
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NLT 99.0 % and NMT 101% of C6H8O7, calculated on the anhydrous basis
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