| ≥1 piece |
|
Items tested
|
Standard
|
|
Appearance
|
White crystal or crystalline powder
|
|
Purity(on dry basis):
|
98-102%
|
|
Loss on drying(105°C 4hr)
|
4.5% max
|
|
Residue on ignition(sulfated)
|
0.2% max
|
|
PH value
|
4.5-6.0
|
|
Arsenic(As)
|
3 ppm max
|
|
Heavy metal as Pb
|
10 ppm max
|
|
Transmittance
|
95% min
|