| Description |
A fine, amorphous, impalpable, pink or reddish brown powder.
|
Identification 'A' |
Gives the reactions of zinc salts
|
| Identification 'B' |
A reddish colour is produced
|
Acid insoluble substances |
NMT 1% w/w
|
| Alkaline substances |
NMT 0.2 ml of 0.05 M sulphuric acid is required to decolorise it.
|
Water soluble dyes |
The filtrate is colourless
|
| Arsenic |
Less than 8 ppm
|
Lead |
The solution remains clear for 5 minutes.
|
| Calcium |
The solution remains clear for 2 minutes.
|
Soluble barium salts |
The solution remains clear for 5 minutes.
|
| Loss on ignition (at 900°C) |
NMT 2.0%
|
Microbial contamination |
Free from Staphylococcus aureus and Pseudomonas aeruginosa
|
| Assay (on ignited basis) |
NLT 98.0% and NMT 100.5% of ZnO
|