|
Appearance
|
White crystalline powder
|
|
Assay
|
Min 99%
|
|
Water (H2O)
|
Max 1%
|
|
Residue on ignition (as SO4)
|
Max 0.2%
|
|
Solubility (0.5 M in water; 20°C)
|
Clear
|
|
pK (at 20°C)
|
6.95
|
|
Melting point
|
275 - 280 deg C
|
|
Chloride (Cl)
|
Max 0.05%
|
|
Copper (Cu)
|
Max 0.0005%
|
|
Sulphate (SO4)
|
Max 0.005%
|
|
Iron (Fe)
|
Max 0.0005%
|
|
Calcium (Ca)
|
Max 0.001%
|
|
Potassium (K)
|
Max 0.005%
|
|
Cadmium (Cd)
|
Max 0.0005%
|
|
Magnesium (Mg)
|
Max 0.0005%
|
|
Nickel (Ni)
|
Max 0.0005%
|
|
Lead (Pb)
|
Max 0.0005%
|
|
Chromium (Cr)
|
Max 0.0005%
|
|
Sodium (Na)
|
Max 0.05%
|
|
Zinc (Zn)
|
Max 0.0005%
|