SODIUM METABISULPHITE
SODIUM METABISULPHITE Extra Pure
Confirming to BP, USP
Short Name: SODIUM METABISULPHITE
Synonym: Sodium pyrosulfite, Sodium disulfite
Basic Details
Article No.
LG4195
Grade
Extra Pure
Purity
96.5%
CAS No.
7681-57-4
HS Code
2832.1090
Shelf Life
60 Months
Packings Avialable
Physical Properties
Physical state at 20 °C
Solid
Colour
White crystalline
Odour
Sulphorous
pH value
4.5 at 50 g/l at 20 °C
Melting point/ Freezing point [°C]
300 °C
Density [g/cm3]
1.48
Solubility in water [% weight]
650 g/l at 20 °C
Partition coefficient Log Pow octanol /water at 20°C
-3.7
Chemical Specifications
Appearance
White crystalline powder
Assay (iodometric)
96.5 - 100%
Assay (as SO2; iodometric)
65 - 67.4%
Identity (acc. to pharmacopoeias)
Passes test
pH (5% solution in water)
3.5 - 5.0
Appearance of solution
Passes test
Insoluble matter in water
Max 0.025%
Residual solvents
Passes test
Chloride (Cl)
Max 0.02%
Thiosulphate (S2O3)
Max 0.05%
Heavy metal (as Pb)
Max 0.002%
Arsenic (As)
Max 0.0004%
Iron (Fe)
Max 0.002%
Safety Information & Hazard Symbols
Symbol
GHS05, GHS07
Signal Word
Danger
Hazardous Statement
H302-H318
Precaution Statement
P280-P305 + P351 + P338