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12619

Sigma-Aldrich

Potassium disulfite

puriss., meets analytical specification of Ph.Eur., BP, NF, FCC, E224, 95.0-101.0% (iodometric), powder, 51.8-57.6% sulfur dioxide

Synonym(s):

Potassium metabisulfite, Potassium pyrosulfite

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About This Item

Linear Formula:
K2S2O5
CAS Number:
16731-55-8
Molecular Weight:
222.32
EC Number:
240-795-3
MDL number:
MFCD00167605
UNSPSC Code:
12352302
PubChem Substance ID:
329749774
NACRES:
NA.21

grade

puriss.

Assay

95.0-101.0% (iodometric)

form

powder

quality

meets analytical specification of Ph.Eur., BP, NF, FCC, E224

impurities

organic volatile impurities, complies (GC)
 residual solvents, in accordance
≤0.001% heavy metals (as Pb)
≤0.08% thiosulfate (S2O3)
51.8-57.6% sulfur dioxide

pH

3.5-4.5 (20 °C, 5%)

anion traces

chloride (Cl-): ≤100 mg/kg

cation traces

As: ≤2 mg/kg
Cu: ≤20 mg/kg
Fe: ≤10 mg/kg
Hg: ≤1 mg/kg
Pb: ≤2 mg/kg
Se: ≤5 mg/kg
Zn: ≤20 mg/kg

suitability

in accordance for appearance of solution

SMILES string

[K+].[K+].[O-]S(=O)S([O-])(=O)=O

InChI

1S/2K.H2O5S2/c;;1-6(2)7(3,4)5/h;;(H,1,2)(H,3,4,5)/q2*+1;/p-2

InChI key

RWPGFSMJFRPDDP-UHFFFAOYSA-L

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Pictograms

Corrosion
GHS05

Signal Word

Danger

Hazard Statements

H318

Precautionary Statements

P280 - P305 + P351 + P338

Hazard Classifications

Eye Dam. 1

Supplementary Hazards

EUH031

Storage Class Code

11 - Combustible Solids

WGK

WGK 1

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Direct and efficient production of ethanol by fermentation from raw corn starch was achieved by using the yeast Saccharomyces cerevisiae codisplaying Rhizopus oryzae glucoamylase and Streptococcus bovis alpha-amylase by using the C-terminal-half region of alpha-agglutinin and the flocculation functional domain
Bindu Nair et al.
International journal of toxicology, 22 Suppl 2, 63-88 (2003-10-14)
Sodium Sulfite, Ammonium Sulfite, Sodium Bisulfite, Potassium Bisulfite, Ammonium Bisulfite, Sodium Metabisulfite, and Potassium Metabisulfite are inorganic salts that function as reducing agents in cosmetic formulations. All except Sodium Metabisulfite also function as hair-waving/straightening agents. In addition, Sodium Sulfite, Potassium
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The Journal of organic chemistry, 67(18), 6550-6552 (2002-08-31)
A high-yield synthesis was developed for the preparation of 2,2'-bipyrimidine (1) using the Ullmann coupling of 2-iodopyrimidine. The new procedure was also used for the preparation of 4,4',6,6'-tetramethyl-2,2'-bipyrimidine (2) and 5,5'-dibromo-2,2'-bipyrimidine (3).
M K Dutt
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International journal of food microbiology, 116(1), 32-36 (2007-02-27)
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