1 | Description | Colourless, translucent crystals;Efflorescent in warm, in dry air. | Colourless, translucent crystals; white or almost white granular to fine crystalline powder. Efflorescent in warm, in dry air. |
2 | Solubility | Complies | Very soluble in water, freely soluble in alcohol, very slightly soluble in ether |
3 | Identification by Chemical test | Complies | The solution is strongly acidic |
4 | Identification (By IR) | Complies | IR spectra of the sample should be concomitant with IR spectra of the corresponding standard |
5 | Identification (By Water) | 8.6% | 7.5% to 9.0% |
6 | Identification | Complies | Yields the reactions characteristic of citrates. |
7 | Appearance of solution | Complies | The solution is clear and colourless or not more intensely coloured than reference solution YS7, BYS7 or GYS7 |
8 | Clarity of solution | Complies | The sample solution shows the same clarity as that of water or its opalescence is not more pronounced that standard suspension A |
9 | Colour of solution | Complies | The sample solution is not more intensely colored than water or standard solutions A, B, and C. |
10 | Assay (Anhydrous basis) | 99.8% | 99.5% - 100.5% |
11 | Residue on ignition | 0.04% | NMT 0.1% |
12 | Sulfate | Less than 150ppm | NMT 150ppm |
13 | Limit of oxalic acid | Less than 360ppm | NMT 360ppm |
14 | Readily carbonizable substances | Complies | The color of the acid is not darker than that of a similar volume of reference solution. |
15 | Chloride (Cl) | Less than 0.0005% | NMT 0.0005% |
16 | Oxalate | Complies | No turbidity should appear. |
17 | Calcium | 7ppm | NMT 200ppm |
18 | Iron | 0.0003% | NMT 0.001% |
19 | Arsenic | Less than 0.0001% | NMT 0.0001% |
20 | Barium | Complies | Any opalescence produced should not more intense than that of mixture of 5ml of solution A and 5ml of distilled water |
21 | Water | 8.6% | 7.5% to 9.0% |
22 | Sulphated ash | 0.04% | NMT 0.1% |
23 | Oxalic acid | Complies | Any pink colour produced is not more intense than that produced by carrying out the test using 0.2mg of oxalic acid dissolved in 4ml of water. |