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Appearance
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Solution is clear, and colourless
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Description
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A white, crystalline powder or colourless shiny plates unctuous to the touch or white crystals; odourless
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Identifications
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-
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Identification 'A'
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The flame has a green border
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Identification 'B'
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The solution is slightly acidic
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pH
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3.8 to 4.8
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Solubility in ethanol
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The solution is not more opalescent than opalescence standard OS2, and colourless
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Arsenic
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NMT 10 ppm
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Heavy metals
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NMT 20 ppm
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Sulphates
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NMT450 ppm
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Loss on drying
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NMT 0.5%
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Assay (on dried basis)
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99.5 – 100.5%
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