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Sodium metabisulfite (MBS, Sodium disulfite) is an inorganic salt. It is the sodium salt of disulphurous (pyrosulfurous) acid. It is widely used as reducing agent in textile and photography industry. It is commonly added to various foods and wines as preservative.
grade
puriss.
Quality Level
200
Assay
97-100.5%
form
powder or crystals
quality
dry
meets analytical specification of Ph. Eur., BP, NF, FCC, E223
composition
SO2, 65.0-67.4%
impurities
residue of solvents, complies
≤0.02% thiosulfate (S2O3)
pH
3.5-5.0 (20 °C, 5%)
mp
>300 °C (lit.)
anion traces
chloride (Cl-): ≤100 mg/kg
Rp 1.534.000
Rp 3.250.000
Rp 2.197.000
Rp 2.057.000
Rp 5.089.000
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