Specificity： Colourless or white crystalline granule or crystalline powder, odourless, steady in air; relative density 2.338, melting point 96 ℃ -253 ℃, easily soluble in water (83.5g//100ml, 90 ℃ ), PH4.2-4.7 in 2.7% agueous solution. Insoluble in ethanol.
Quality index：
|
Quality index |
FCC,1997 |
|
Content (on the base of drying basis)% |
98.0 |
|
Arsenic, ≤% |
0.0003 |
|
Fluoride(F), ≤% |
0.001 |
|
Heavy metals(as Pb), ≤% |
0.0015 |
|
Water insolubles, ≤% |
0.2 |
|
Pb, ≤% |
0.0002 |
|
Loss on heating, ≤% |
1 |