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1.05057

Supelco

Potassium disulfite

for analysis EMSURE®

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Synonym(s):
Potassium disulfite, Potassium metabisulfite, Potassium pyrosulfite
Empirical Formula (Hill Notation):
K2O5S2
CAS Number:
Molecular Weight:
222.32
MDL number:
UNSPSC Code:
12352302
EC Index Number:
240-795-3
NACRES:
NA.21

Quality Level

product line

EMSURE®

Assay

≥96% (iodometric)

form

solid

potency

2300 mg/kg LD50, oral (Rat)

impurities

≤0.005% In water insoluble matter

pH

3.0-4.5 (20 °C, 50 g/L in H2O)

mp

150 °C (decomposition)

solubility

450 g/L

bulk density

1000‑1300 kg/m3

anion traces

chloride (Cl-): ≤0.005%

cation traces

As: ≤0.0001%
Cu: ≤0.001%
Fe: ≤0.0005%
Pb: ≤0.001%
Zn: ≤0.001%

storage temp.

2-30°C

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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Analysis Note

Assay (iodometric): ≥ 96 %
In water insoluble matter: ≤ 0.005 %
Chloride (Cl): ≤ 0.005 %
As (Arsenic): ≤ 0.0001 %
Cu (Copper): ≤ 0.001 %
Fe (Iron): ≤ 0.0005 %
Pb (Lead): ≤ 0.001 %
Zn (Zinc): ≤ 0.001 %

Legal Information

EMSURE is a registered trademark of Merck KGaA, Darmstadt, Germany

Pictograms

CorrosionExclamation mark

Signal Word

Danger

Hazard Statements

Hazard Classifications

Eye Dam. 1 - STOT SE 3

Target Organs

Respiratory system

Supplementary Hazards

Storage Class Code

13 - Non Combustible Solids

WGK

WGK 1


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