|
Appearance
|
A white powder
|
|
Assay
|
Min 99%
|
|
Infrared spectrum
|
Conforms
|
|
Solubility (25% in water)
|
Clear and colorless solution
|
|
pH range
|
4.0 - 5.5
|
|
UV absorbance (at 250 nm;10%; 1 cm; water)
|
Max 0.1
|
|
Sulphate (SO4)
|
Max 0.005%
|
|
Heavy metal (as Pb)
|
Max 0.0005%
|
|
Water (by KF)
|
Max 0.2%
|
|
Biological buffer, pKa at 25°C
|
8.3
|