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Ascorbic Acid Quality standard
|
|
Item
|
Index
|
Characteristic
|
white crystalline powder
|
Melting point
|
190-192
|
Specific rotation
|
+21.0
|
Identification
|
Conforms
|
Assay
|
≥ 99.0%
|
Clarity of solution
|
Fine
|
Colour of solution(A 420nm )
|
A≤0.03
|
Residue on ignition
|
≤0.1%
|
Ferrite
|
≤2ppm
|
Copper
|
≤5ppm
|
Heavy metals
|
≤10ppm
|