English
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
