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Item | Value | ||||
Top-grade | First grade | Qualified product | |||
sodium sulfite (Na2SO3),% | ≥ 98.0 | ≥ 96.0 | ≥ 93.0 | ||
Fe,% | ≤ 0.003 | ≤ 0.005 | ≤ 0.02 | ||
water-Insoluble ,% water-Insoluble ,% | ≤ 0.02 | ≤ 0.03 | ≤ 0.05 | ||
Free alkali(as Na2SO3),% | ≤ 0.10 | ≤ 0.40 | ≤ 0.80 | ||
Sulfate(as Na2SO4),% | ≤ 2.5 | — | — | ||
Chloride(as NaCl),% | ≤ 0.10 | — | — |