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LC4937 Potassium disulfite
extra pure Ph Eur,NF,E 224

 

Order number Packaging Quantity Price €
AC31937 Plastic bottle 5 kg Inquire
AC31937 Double PE Sack 25 kg Inquire

 

Product information
Grade Ph Eur,NF,E 224
Synonyms Potassium metabisulfite, Potassium pyrosulfite
Hill Formula K2O5S2
Chemical formula K2S2O5
HS Code 2832 20 00
EC number 240-795-3
Molar mass 222.33 g/mol
CAS number 16731-55-8

 

Chemical and physical data
Solubility 450 g/l (20 °C)
Melting point 150 °C (decomposition)
Molar mass 222.33 g/mol
Density 2.34 g/cm3
Bulk density 1000 – 1300 kg/m3
pH value 3.0 – 4.5 (50 g/l, H2O, 20 °C)

 

Safety information
R Phrase R 31-37-41
Contact with acids liberates toxic gas.Irritating to respiratory system.Risk of serious damage to eyes.
S Phrase S 26-39
In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.Wear eye/face protection.
Categories of danger irritant
Hazard Symbol  Irritant
Storage class 10 – 13 Other liquids and solids
WGK WGK 1 slightly water endangering
Disposal 6
Sulfides and sulfites as well as other reducing substances, inorganic cyanides and isonitriles: Stir into sodium hypochlorite solution (Cat. No. 105614) and, if necessary, leave to react for several days. Caution: some substances may show a violent reaction! Draw off any toxic or flammable gases that may be formed. Excess oxidant should be neutralized with sodium thiosulfate (Cat. No. 106513). Container D or E.

 

Toxicological data
LD 50 oral LD50 rat 2300 mg/kg

 

Specifications
Assay
– iodometric
95.0 – 101.0 %
– iodometric, SO2 54.8 – 57.6 %
Identity passes test
Appearance of solution passes test
pH-value (5 %; water) 3.0 – 4.5
Chloride (Cl) ≤ 0.05 %
Heavy metals (as Pb) ≤ 0.001 %
Thiosulfate (S2O3) passes test
As (Arsenic) ≤ 0.0002 %
Cu (Copper) ≤ 0.0025 %
Fe (Iron) ≤ 0.00100 %
Hg (Mercury) ≤ 0.0001 %
Pb (Lead) ≤ 0.0005 %
Se (Selenium) ≤ 0.00250 %
Zn (Zinc) ≤ 0.0005 %
Residual solvents (Ph. Eur./USP/ICH) Excluded by manufacturing process