Item
|
Standard
|
Result
|
Appearance
|
White crystal or Powder
|
White crystal or Powder
|
Content (%)
|
≥99.6
|
99.89
|
Loss on drying(%)
|
≤0.3
|
0.16
|
Residue on ignition(%)
|
≤0.01
|
0.005
|
Heavy metal(Pb) μg/g
|
≤10
|
2.2
|
Fe, μg/g
|
≤3
|
0.8
|
Cu, μg/g
|
≤1
|
0.2
|
Mn, μg/g
|
≤1
|
0.2
|
As, μg/g
|
≤4
|
2
|
Sulfate, μg/g
|
≤30
|
14.2
|
Chloride, μg/g
|
≤10
|
3.5
|
Melting point, ℃
|
165-168
|
166.8
|
Colour, APHA
|
≤5
|
4
|
Clarity(5% water solution)
|
Cloudless
|
Cloudless
|
Clarity(20% DMSO)
|
Cloudless
|
Cloudless
|
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