Russia National Standard GOST 11683-76

Sodium Metabisulfite for Industrial Use

Specifications:

Items Specifications
Grade 1 Grade 2
Appearance white or yellowish crystalline powder white or yellowish crystalline powder
Main content (Na2S2O5) %,≥ 95.0 92.5
Iron (Fe)%,≤ 0.005 0.015
Water Insoluble %,≤ 0.05 0.10
Arsenic (As)%, ≤ 0.001 0.001

Remarks: Sodium metabisulfite used in pharmaceutical and food industries, shall have heavy metal (Pb) mass fraction not exceeding 0.002% and chloride (Cl) mass fraction not exceeding 0.2%.

Sodium Metabisulfite Russia National Standard GOST 11683-76