| Item |
STANDARD |
| Characteristics |
A white crystalline or crystammine powder acid taste and slightly agreeable. |
| Specific rotation [a]D20° |
+30.5 °~ +32.5° |
| Chloride (Cl) |
0.02% max |
| Ammonium (NH4) |
0.02% max |
| Sulfate (SO4) |
0.02% max |
| Iron (Fe) |
10ppm max |
| Heavy metals (Pb) |
10ppm max |
| Cadmium |
1ppm max |
| Mercury |
0.1ppm max |
| Arsenic (AS2O3) |
1ppm max |
| Other amino acids |
Conform to starndard. |
| Loss on drying |
0.5% max |
| Residue on ignition(sulfated) |
0.10% max |
| Assay: |
98.5% to 100.5% |
| PH |
3.0 to3.5 |
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