Analysis Note

metal trace analysis: corresponds to requirements

Application

Sodium metabisulfite may be used as an antioxidant which when added to anesthetic formulations serves to minimize epinephrine oxidation in the quantification of epinephrine in dental anesthetic solutions by capillary electrophoresis. Sodium metabisulfite may also be used as a standard in the determination of catecholamines in human plasma by high-performance liquid chromatography with electrochemical detection.

General description

Sodium metabisulfite is primarily used as an antioxidant and antimicrobial agent in a wide variety of foods and drugs. It is also used as the main additive in the prevention of melanosis in shrimp.

anion traces	thiosulfate (S₂O₃^2-): ≤500 mg/kg, chloride (Cl^-): ≤50 mg/kg
application(s)	cleaning productscosmeticsfood and beveragespersonal care
assay	≥98.0% (iodometric, RT)
cation traces	K: ≤200 mg/kg, Cr: ≤5 mg/kg, Mn: ≤5 mg/kg, Mg: ≤5 mg/kg, Ca: ≤10 mg/kg, Pb: ≤5 mg/kg, Cu: ≤5 mg/kg, Fe: ≤5 mg/kg, Zn: ≤5 mg/kg, Ni: ≤5 mg/kg, As: ≤0.5 mg/kg, Cd: ≤5 mg/kg, Co: ≤5 mg/kg
format	neat
grade	analytical standard
InChI key	HRZFUMHJMZEROT-UHFFFAOYSA-L
InChI	1S/2Na.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2
mp	>300 °C (lit.)
Quality Level	100
shelf life	limited shelf life, expiry date on the label
SMILES string	[Na+].[Na+].[O-]S(=O)S([O-])(=O)=O