| Description |
White or colourless crystals or a white crystalline powder
|
Identifications |
-
|
| Identification 'A' |
Gives the reactions of chlorides
|
Identification 'B' |
Gives the reactions of sodium salts
|
| Appearance of solution |
Solution A should be clear and colourless
|
Acidity or alkalinity |
Not more than 0.5 ml of 0.01 M hydrochloric acid or of 0.01 M sodium hydroxide is required to change the colour of the solution
|
| Arsenic |
NMT 1 ppm
|
Barium |
No turbidity is produced within 2 hours
|
| Ferrous ion (Fe2+) |
No blue colour should be produced within 10 minutes
|
Heavy metals |
NMT 5 ppm
|
| Iodides |
The substance shows no blue colour after 5 minutes
|
Iron |
NMT 20 ppm
|
| Aluminium |
NMT 0.2 ppm (The fluorescence of the test solution is not greater than that of the standard solution)
|