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Appearance
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Colourless deliquescent crystals with a pungent odour
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Assay
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Min 99%
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Clarity of solution
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Passes test
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Melting point
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Min 56°C
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Insoluble matter
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Max 0.005%
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Heavy metal (as Pb)
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Max 0.002%
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Chloride (Cl)
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Max 0.002%
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Nitrate (NO3)
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Max 0.002%
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Phosphate (PO4)
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Max 0.0005%
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Sulphate (SO4)
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Max 0.02%
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Residue on ignition
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Max 0.02%
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Iron (Fe)
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Max 0.001%
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Substance darkened by H2SO4
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Passes test
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