Complaint
| Item | Specifications |
| Assay(CNO4S)(dried basis) | 99% min |
| pH of 1% solution at 25ºC | 2.5-4.5 |
| Heavy metals(as Pb) | 5ppm max |
| Fe content | 5ppm max |
| Loss on drying (105ºC) | 0.5%max |
| pka at 20ºC | 7.10-7.30 |
| Solution (10%)In water | Passes Test |
| Color of 1M·Solution(425nm,Hazen) | 50 max |
| UV Absorbance of a 0.1M Solution(1-cm path vs water)at 260 nm | 0.02 max |
