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Description
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Bluish green crystals or a light green, crystalline powder; odourless. Efflorescent in air. On exposure to moist air, the crystals rapidly oxidise and become brown.
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Assay
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NLT 98.0% and NMT 105.0% of FeSO4.7H2O
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Identification
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It gives reaction (A) of ferrous salts and the reactions of sulphates
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Appearance of solution
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Passes test
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pH (5% solution; 25°C)
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3.00 - 4.00
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Arsenic
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Less than 2 ppm
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Copper
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Less than 50 ppm
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Lead
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Less than 50 ppm
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Zinc
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Less than 500 ppm
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Manganese
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Less than 0.1%
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Ferric ion (Fe+3)
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NMT 0.5%
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Chlorides
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Below 250 ppm
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