Grade |
BP |
EP |
IP |
USP |
Appearance of solution |
Should not be more intense than ref soln B4 |
Clear in acetic acid |
Clear in acetic acid |
Clear |
Identification |
Positive to tests of Magnesium & Carbonate |
Positive to tests of Magnesium & Carbonate |
Positive to tests of Magnesium & Carbonate |
Positive to tests of Magnesium & Carbonate |
Description |
A very light, White powder, 15 gm occupies a volume of about 100 ml. |
A very light, White amorphous powder |
A very light, White powder, 15 gm occupies a volume of about 150 ml |
A very light& bulky, White powder, odour less and stable in air |
Solubility |
In-soluble in water, Soluble in Dilute Acids. |
in-soluble in water, Soluble in Dilute Acids |
in-soluble in water, Soluble in Dilute Acids |
in-soluble in water& alcohol, Soluble in Dilute Acids with effervescence |
Arsenic |
Max 2 ppm |
Max 2 ppm |
Max 2 ppm |
Max 4 ppm |
Iron |
Max 200 ppm |
Max 400 ppm |
Max 400 ppm |
Max 0.02% |
Heavy Metals |
Max 20 ppm |
Max 0.002% |
Max 0.002% |
Max 0.003% |
Chloride |
700 PPM Max. |
0.07% Max. |
0.1% Max. |
0.1% Max. |
Calcium |
0.75% Max. |
0.75% Max. |
0.75% Max. |
0.45% Max. |
Soluble Substance |
1 % Max. |
1 % Max. |
1 % Max. |
1 % Max. |
Substance In-soluble in Acetic Acid |
0.05% Max. |
0.05% Max |
0.05% Max. |
0.05% Max. |
Sulphate |
0.3% Max. |
0.3% Max. |
0.3% Max. |
- |
Assay as MgO |
40.0 % to 45.0 % |
40.0 % to 45.0 % |
40.0 % to 43.5 % |
40.0 % to 43.5 % |