Sodium Metabisulfite, 98%

Sodium metabisulfite (SMBS) is commonly used for removal of free chlorine and as a biostatic. Other chemical reducing agents exist (e.g., sulfur dioxide), but they are not as cost-effective as SMBS. When dissolved in water, sodium bisulfite (SBS) is formed from SMBS: Na₂S₂O₅ + H₂O → 2 NaHSO₃, then reduces hypochlorous acid according to: 2NaHSO₃ + 2HOCl → H₂SO₄ + 2HCl + Na₂SO₄. In theory, 1.34 mg of sodium metabisulfite will remove 1.0 mg of free chlorine. In practice, however, 3.0 mg of sodium metabisulfite is normally used to remove 1.0 mg of chlorine.

Product Specifications

Applications and Benefits:

• Preservative
• Antioxidant
• Bleaching agent
• Chlorine removal
• Biostatic agent

Caution:

Toxic by inhalation. Tolerance limit: 5 mg per cubic meter of air.

Synonyms:

Pyrosulfurous acid, disodium salt; Sodium Pyrosulfite; Disodium Salt Pyrosulfurous Acid; Sodium disulfite; Disodium disulfite; Disulfurous