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Appearance
|
White big flakes
|
|
Assay as SO2 (Iodometric; on dried basis)
|
45 - 55%
|
|
Clarity and color of solution
|
Clear and colorless
|
|
Alkalinity
|
Passes test
|
|
pH (2% solution)
|
9.5 - 10.5
|
|
Sodium sulphite (Na2SO3)
|
Max 5%
|
|
Iron (Fe)
|
Max 0.001%
|
|
Sulphide (S)
|
Passes test
|
|
Loss on drying (at 105°C)
|
Max 27%
|