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Appearance
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White powder
|
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Assay (alkalimetric; on dried basis)
|
Min 99%
|
|
Identity (IR)
|
Passes test
|
|
UV absorbance (at 250 nm; 50 g/l; 1 cm; water)
|
Max 0.05
|
|
Chloride (Cl)
|
Max 0.005%
|
|
Sulphate (SO4)
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Max 0.025%
|
|
Heavy metal (as Pb)
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Max 0.0005%
|
|
Sodium (Na)
|
Max 0.005%
|
|
Loss on drying (at 105°C)
|
Max 1.0%
|
|
Biological buffer, pKa at 20°C
|
9.55
|