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Item | Best quality | First quality | Qualified quality |
Content of sodium nitrate (calculated by dry base) % | ≥99.7 | ≥99.3 | ≥98.5 |
Content of sodium nitrite (calculated by dry base) % | ≤0.01 | ≤0.02 | ≤0.15 |
Content of chloride(NaCl) (calculated by dry base) % | ≤0.25 | ≤0.30 | — |
Content of insolubles in water (calculated by dry base) % | ≤0.03 | ≤0.06 | — |
Content of carbonate (calculated by dry base) % | |||
Moisture % | ≤1.0 | ≤1.5 | ≤2.0 |
Content of iron (Fe) % | ≤0.005 | — | — |
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