Sodium metabisulfite

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

cation traces

As: ≤2 mg/kg, Cu: ≤10 mg/kg, Fe: ≤10 mg/kg, Hg: ≤1 mg/kg, Pb: ≤2 mg/kg, Se: ≤5 mg/kg, Zn: ≤10 mg/kg

suitability

complies for appearance of solution

SMILES string

[Na+].[Na+].[O-]S(=O)S([O-])(=O)=O

InChI

1S/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2

InChI key

HRZFUMHJMZEROT-UHFFFAOYSA-L