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Description
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A fine, amorphous, impalpable, pink or reddish-brown powder
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Solubility
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Practically completely soluble in mineral acids and insoluble in water
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Identification
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-
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Identification 'A'
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Filtrate should give the reactions of zinc salts
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Identification 'B'
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A reddish colour should be produced
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Acid insoluble substances
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NMT 1 % w/w
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Alkaline substances
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Not more than 0.2 ml of 0.05 M sulphuric acid is required to decolorize it
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Water soluble dyes
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The filtrate should be colourless
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Ethanol soluble dyes
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The filtrate should be colourless
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Arsenic
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NMT 8 ppm
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Lead
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The solution should remain clear for 5 minutes
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Calcium
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The solution should remain clear
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Soluble barium salts
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The solution should remain clear
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Chlorides
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NMT 750 ppm
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Sulphates
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NMT 0.6%
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Loss on ignition
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NMT 2.0%
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Microbial contamination
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1.0 g should free from Staphylococcus aureus and Pseudomonas aeruginosa
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Assay
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98.0 – 100.5%
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