Sodium metabisulphite (Sodium disulfite or sodium pyrosulphite) is an inorganic compound with the chemical formula Na2S2O5 and it can be used as a disinfectant, antioxidant, and food preservative. It is also used in water treatment and photography.
dry, extra pure, meets analytical specification of Ph. Eur., BP, NF, FCC, E 223, assay 97.0 - 100.5%
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