| Item |
Standard |
| Appearance |
White crystals |
| Content |
99.0-101.0 |
| Loss of drying |
≦15 |
| Ammonium salts ppm |
≦25 |
| Arsenic ppm |
≦2 |
| Benzoate and sallcylate |
No precipitate or violet color appears |
| Heavy metals ppm |
≦10 |
| Free acid or alkali |
Complies with BP/USP/DAB |
| Realily carbonizable |
Not more intensely colored than referance |
| P-toluene sulfonamide |
≦10ppm |
| O-toluene sulfonamide |
≦10ppm |
| Selenium ppm |
≦30 |
| Related substance |
Complies with DAB |
| Clarity and color solution |
Color less clear |
| Organic volatiles |
Colmplies with BP |
| Ph value |
Complies with BP/USP |
| Benzoic acid-sulfonamide |
≦25ppm |
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