|
Appearance
|
Colorless crystals
|
|
Assay (acidimetric; as Na4P2O7.10H2O)
|
99 - 103%
|
|
pH (5% solution in water; 25°C)
|
9.5 - 10.5
|
|
Insoluble matter
|
Max 0.01%
|
|
Chloride (Cl)
|
Max 0.002%
|
|
Sulphate (SO4)
|
Max 0.005%
|
|
Niitrogen compounds (N)
|
Max 0.001%
|
|
Heavy metal (as Pb)
|
Max 0.001%
|
|
Iron (Fe)
|
Max 0.001%
|