POTASSIUM METABISULFITE

Bezeichnung:POTASSIUM METABISULFITE

CAS-Nr16731-55-8

Englisch Name:POTASSIUM METABISULFITE

CBNumberCB5179482

SummenformelK2O5S2

Molgewicht222.32

MOL-Datei16731-55-8.mol

Synonyma

Kaliumpyrosulfit

Dikaliumdisulfit

Kaliumdisulfit

POTASSIUM METABISULFITE physikalisch-chemischer Eigenschaften

Schmelzpunkt	190°C
Dichte	2.34 g/cm³
Dampfdichte	2.3 (vs air)
storage temp.	Store at +5°C to +30°C.
Löslichkeit	H₂O: 0.1 M at 20 °C, clear, colorless
Aggregatzustand	Powder/Solid
Wichte	2.3
Farbe	White to slightly yellow
PH	2.5-4.5 (25℃, 0.1M in H2O)
Geruch (Odor)	Odorless
Säure-Base-Indikators(pH-Indikatoren)	3-4.5 at 22.2 g/l at 25 °C
Wasserlöslichkeit	Soluble in water. Insoluble in ethanol.
Sensitive	Air Sensitive
Decomposition	150°C
maximale Wellenlänge (λmax)	267nm(H2O)(lit.)
Merck	14,7645
EPA chemische Informationen	Disulfurous acid, potassium salt (1:2) (16731-55-8)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	31-36/37/38-41
S-Sätze:	26-36-39
WGK Germany	1
RTECS-Nr.	TT4920000
F	23
TSCA	Yes
HS Code	28322000
Giftige Stoffe Daten	16731-55-8(Hazardous Substances Data)
Toxizität	LD50 orally in Rabbit: 2300 mg/kg

Gefahreninformationscode (GHS)

POTASSIUM METABISULFITE Chemische Eigenschaften,Einsatz,Produktion Methoden

ERSCHEINUNGSBILD
WEISSES KRISTALLINES PULVER MIT STECHENDEM GERUCH.
CHEMISCHE GEFAHREN
Zersetzung beim Erhitzen und Verbrennen unter Bildung giftiger und reizender Rauche mit Schwefeloxiden. Reagiert mit Säuren unter Freisetzung von giftigem und reizendem Schwefeldioxid.
ARBEITSPLATZGRENZWERTE
TLV nicht festgelegt (ACGIH 2005).
MAK nicht festgelegt (DFG 2005).
AUFNAHMEWEGE
Aufnahme in den Körper durch Inhalation und durch Verschlucken.
INHALATIONSGEFAHREN
Verdampfung bei 20°C vernachlässigbar; eine gesundheitsschädliche Partikelkonzentration in der Luft kann jedoch beim Dispergieren schnell erreicht werden.
WIRKUNGEN BEI KURZZEITEXPOSITION
WIRKUNGEN BEI KURZZEITEXPOSITION:
Inhalation dieser Substanz kann zu asthmaähnlichen Reaktionen führen.
WIRKUNGEN NACH WIEDERHOLTER ODER LANGZEITEXPOSITION
Wiederholter oder andauernder Kontakt kann zu Hautsensibilisierung führen. Wiederholte oder andauernde Inhalation kann asthmatische Beschwerden hervorrufen.
LECKAGE
Verschüttetes Material in Behältern sammeln; falls erforderlich durch Anfeuchten Staubentwicklung verhindern. Reste mit viel Wasser wegspülen. Persönliche Schutzausrüstung: Atemschutzgerät, P2-Filter für schädliche Partikel.
R-Sätze Betriebsanweisung:
R31:Entwickelt bei Berührung mit Säure giftige Gase.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
Chemische Eigenschaften
White to slightly yellowish fine cryst. powder
Chemische Eigenschaften
Potassium metabisulfite occurs as white or colorless free-flowing crystals, crystalline powder, or granules, usually with an odor of sulfur dioxide.
Verwenden
Potassium Metabisulfite is a chemical preservative and antioxi- dant obtained as white or colorless crystals, powder, or granules. it is soluble in water and insoluble in alcohol. the sulfite salt yields sulfurous acid at a low ph. it is used as a food preservative.
Verwenden
Potassium Metabisulfite (2:1) is used as a chemical preservative.
Verwenden
As antifermentative in breweries and wineries; bleaching straw; preservative for fruits and vegetables.
Allgemeine Beschreibung
Potassium disulfite (Potassium metabisulfite, PMB) is an inorganic salt with antimicrobial properties. It is a sulfiting agent that prevents browning of foods.
Pharmazeutische Anwendungen
Potassium metabisulfite is used in applications similar to those of sodium metabisulfite in pharmaceuticals, and in the food, brewing, and wine making industries. It is used as an antioxidant, antimicrobial preservative and sterilizing agent.
Kontakt-Allergie
Potassium metabisulfite is an antioxidant used as an antifermentative agent in breweries and wineries, as a preservative of fruits and vegetables, and to bleach straw. Reactions to both sodium and potassium metabisulfite are expected.
Sicherheitsprofil
Experimental reproductive effects. A very irritating material. Questionable carcinogen with experimental tumorigenic data. Mutation data reported. When heated to decomposition it emits toxic fumes of SOx and K2SO3. See also SULFITES.
Sicherheit(Safety)
Potassium metabisulfite is used in a variety of foods and pharmaceutical preparations, including oral, otic, rectal, and parenteral preparations. Potassium metabisulfite is considered a very irritating material, and may cause dermatitis on exposed skin.
Hypersensitivity reactions to potassium metabisulfite and other sulfites, mainly used as preservatives in food products, have been reported. Reactions include bronchospasm and anaphylaxis; some deaths have also been reported, especially in those with a history of asthma or atopic allergy.These reactions have led to restrictions by the FDA on the use of sulfites in food applications. However, this restriction has not been extended to their use in pharmaceutical applications. Indeed, epinephrine (adrenaline) injections used to treat severe allergic reactions may contain sulfites.
The WHO has set an acceptable daily intake of sulfites, as SO₂, at up to 0.35 mg/kg body-weight.
Lager
Potassium metabisulfite should be stored in a cool, dark place. When stored at a maximum temperature of 25°C and maximum relative humidity of 45%, the shelf-life is 6 months. Potassium metabisulfite decomposes at temperatures above 150°C. In the air, it oxidizes to the sulfate, more readily in the presence of moisture.
In aqueous solution, potassium metabisulfite forms potassium bisulfite (KHSO₃) which exerts a strong reducing effect.
Inkompatibilitäten
Potassium metabisulfite is incompatible with strong acids, water, and most common metals. It reacts with nitrites and sodium nitrate at room temperature, which occasionally results in the formation of flame. The reaction may be explosive if water is present. Potassium metabisulfite liberates SO₂ with acids.
Sulfites, including potassium metabisulfite, can react with various pharmaceutical compounds including sympathomimetics such as epinephrine (adrenaline),chloramphenicol,cisplatin, and amino acids,which can result in their pharmacological inactivation. Sulfites are also reported to react with phenylmercuric nitrate,and may adsorb onto rubber closures.
Regulatory Status
GRAS listed. Accepted in Europe for use as a food additive in certain applications. Included in the FDA Inactive Ingredients Database (IM and IV injection; otic and rectal solutions and suspensions). Included in the Canadian List of Acceptable Nonmedicinal Ingredients.

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