|
Appearance
|
A white powder
|
|
Assay
|
Min 99%
|
|
Biological buffer, pKa at 25°C
|
8.3
|
|
pH range
|
4.0 - 5.5
|
|
UV absorbance (at 250 nm; 50 g/l; 1 cm; water)
|
Max 0.05
|
|
Chloride (Cl)
|
Max 0.005%
|
|
Sulphate (SO4)
|
Max 0.005%
|
|
Heavy metal (as Pb)
|
Max 0.0005%
|
|
Sodium (Na)
|
Max 0.005%
|
|
Loss on drying (at 105°C)
|
Max 0.2%
|