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Test |
Limit |
Assay |
99.5 % min. |
Solubility |
Freely Soluble in water, practically insoluble in ethanol (96 %). |
Appearance of solution (20 % w/v solution) |
Solution is clear and not more intensely colored than reference color solution Y6 |
Sulphate |
NMT 0.003% |
Silicate |
NMT 0.002% |
Calcium (Ca) |
NMT 0.03% |
Phosphate (PO4) |
NMT 0.001% |
Loss on Drying at 285 C |
0.5% Max |
Heavy metals |
NMT 0.0005% |
Magnesium |
NMT 0.005% |
Potassium |
NMT 0.005% |
Arsenic |
NMT 0.00004% |
Chloride |
NMT 0.001% |
Nitrogen compound |
NMT 0.001% |
Copper |
NMT 0.0005% |
Insoluble matter |
NMT 0.01% |
Iron |
NMT 0.0005% |