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Appearance
|
White crystalline powder
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|
Assay (by HClO4 titration; on dried basis)
|
Min 99.5%
|
|
pH (5% solution in water)
|
10 - 11
|
|
Melting point
|
169 - 171°C
|
|
Chloride (Cl)
|
Max 0.001%
|
|
Sulphated ash
|
Max 0.01%
|
|
Water (H2O)
|
Max 0.5%
|
|
Absorbance (A1%/1cm; 10% in water)
|
-
|
|
at 260 nm
|
Max 0.02
|
|
at 280 nm
|
Max 0.02
|
|
at 300 nm
|
Max 0.02
|
|
at 405 nm
|
Max 0.004
|
|
at 430 nm
|
Max 0.004
|
|
Biological buffer at 25°C
|
pKa 8.07
|