|
Item
|
Standard
|
|
Appearance
|
white crystalline powder
|
|
Content(after drying) %
|
≥99.0
|
|
PH(5% aqueous solution)
|
7.5-9.0
|
|
Chloride(CI)
|
≤0.01
|
|
Drying loss( 240°C, 2 hours)
|
≤8.0
|
|
Heavy metal(as Pb) %
|
≤0.0005
|
|
Iron(Fe) %
|
≤0.001
|
|
Arsenic(As) %
|
≤0.0003
|
|
Lead(Pb) %
|
≤0.0002
|
|
Mercury(Hg)%
|
≤0.0001
|
|
Melting point
|
92 ~ 96
|
