|
Test Item
|
Specification
|
||
|
99.5%
|
99%
|
||
|
Appearance
|
Faint yellow crystal
|
||
|
Purity
|
99.5% min
|
99.0 min
|
|
|
Moisture
|
0.3% max
|
0.3% max
|
|
|
Matter indissoluble in water
|
0.01% max
|
0.01% max
|
|
|
Cyanide
|
0.10% max
|
0.10%max
|
|
|
Chloride
|
0.10% max
|
0.20%max
|
|
|
Sulphate
|
0.10% max
|
–
|
|
|
As
|
1 ppm max
|
–
|
|
|
Pb
|
10 ppm max
|
–
|
|
|
Zn
|
25 ppm max
|
–
|
|
|
Cu
|
5 ppm max
|
–
|
|
|
Sn
|
10 ppm max
|
–
|
|