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| items | Industrial grade | Food grade |
| Total phosphate (P2O5) | 68% min | 68% min |
| Inactive phosphate(P2O5) | 7.5% max | 7.5% max |
| Iron (Fe) | 0.05% max | 0.05% max |
| PH value(1% solution) | 5.8-7.3 | 5.8-6.5 |
| solubility | Qualified | Qualified |
| Heavy metals (Pb) | -------- | 0.001% max |
| Arsenic (As) | -------- | 0.0003% max |
| Fluoride (F) | -------- | 0.003% max |
| Water insoluble | 0.05%max | 0.06% max |
