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Appearance
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Off-White to Pale Purple Moist Crystals/Powder
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|
Assay (by Na2S2O3 titration)
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98.0-101.0%
|
|
Infrared spectrum
|
Passes test
|
|
Insoluble matter (10 % in dil. HNO3)
|
Max 0.005%
|
|
Chloride (Cl)
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Max 0.0005%
|
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Sulphate (SO4)
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Max 0.01%
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Calcium (Ca)
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Max 0.01%
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|
Magnesium (Mg)
|
Max 0.005%
|
|
Potassium (K)
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Max 0.005%
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Sodium (Na)
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Max 0.05%
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|
Substance not precipitated by ammonia (as SO4)
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Max 0.1%
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