|
Description
|
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.
|
|
Assay
|
NLT 98.0% and NMT 105.0% of FeSO4.7H2O
|
|
Identification
|
It gives reaction (A) of ferrous salts and the reactions of sulphates
|
|
Appearance of solution
|
Passes test
|
|
pH (5% solution; 25°C)
|
3.00 - 4.00
|
|
Arsenic
|
Less than 2 ppm
|
|
Copper
|
Less than 50 ppm
|
|
Lead
|
Less than 50 ppm
|
|
Zinc
|
Less than 500 ppm
|
|
Manganese
|
Less than 0.1%
|
|
Ferric ion (Fe+3)
|
NMT 0.5%
|
|
Chlorides
|
Below 250 ppm
|
|
Assay
|
NLT 98.0% and NMT 105.0% of FeSO4.7H2O
|