Potassium disulfite

Product Name

Potassium disulfite, puriss., meets analytical specification of Ph.Eur., BP, NF, FCC, E224, 95.0-101.0% (iodometric), powder, 51.8-57.6% sulfur dioxide

InChI key

RWPGFSMJFRPDDP-UHFFFAOYSA-L

InChI

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

SMILES string

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

grade

puriss.

assay

95.0-101.0% (iodometric)

form

powder

quality

meets analytical specification of Ph.Eur., BP, NF, FCC, E224

impurities

organic volatile impurities, complies (GC)
residual solvents, in accordance
≤0.001% heavy metals (as Pb)
≤0.08% thiosulfate (S₂O₃)
51.8-57.6% sulfur dioxide

pH

3.5-4.5 (20 °C, 5%)

anion traces

chloride (Cl^-): ≤100 mg/kg

cation traces

As: ≤2 mg/kg
Cu: ≤20 mg/kg
Fe: ≤10 mg/kg
Hg: ≤1 mg/kg
Pb: ≤2 mg/kg
Se: ≤5 mg/kg
Zn: ≤20 mg/kg

suitability

in accordance for appearance of solution

Quality Level

100