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Merck
CN

12619

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
NACRES:
NA.21
PubChem Substance ID:
329749774
UNSPSC Code:
12352302
EC Number:
240-795-3
MDL number:
MFCD00167605
Assay:
95.0-101.0% (iodometric)
Form:
powder

Key Documents

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Product Name

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

InChI key

RWPGFSMJFRPDDP-UHFFFAOYSA-L

InChI

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

SMILES string

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

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

Quality Level

100

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Related Categories

pictograms

Corrosion
GHS05

signalword

Danger

hcodes

H318

Hazard Classifications

Eye Dam. 1

supp_hazards

EUH031

Storage Class

11 - Combustible Solids

wgk

WGK 1

Regulatory Information

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Certificates of Analysis (COA)

Lot/Batch Number
BCCN7524
BCCM7349
BCCL8387
BCCM2605
BCCL9072

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Hisayori Shigechi et al.
Applied and environmental microbiology, 70(8), 5037-5040 (2004-08-06)
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
Gábor Vlád et al.
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 Takahashi et al.
Japanese journal of cancer research : Gann, 77(2), 118-124 (1986-02-01)
Ethanol, potassium metabisulfite, formaldehyde and hydrogen peroxide were tested for tumor-promoting activity in a two-stage stomach carcinogenesis experiment. Male outbred Wistar rats were given N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) in the drinking water (100 mg/liter) and a diet supplemented with 10% sodium chloride
E Pastorkova et al.
International journal of food microbiology, 161(3), 209-213 (2013-01-22)
This paper investigates the in vitro antimicrobial potential of 15 grape phenolic compounds of various chemical classes (phenolic acids, stilbenes and flavonoids) using the broth microdilution method against yeasts and acetic acid bacteria frequently occurring in deteriorated wine. Pterostilbene (MICs=32-128
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