Potassium Metabisulphite Extra Pure

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Potassium Metabisulphite Extra Pure is a white crystalline powder with a sharp sulfurous odor, valued for its powerful antioxidant and preservative properties. In the food and beverage industry, it is commonly used as a sterilizing agent, particularly in winemaking and brewing, to inhibit unwanted microbial activity and preserve color and flavor. In laboratory settings, it serves as a reducing agent and a source of sulfur dioxide. Its extra pure grade ensures minimal impurities, making it ideal for applications that demand high levels of chemical stability, such as pharmaceuticals, cosmetics, and precision formulations.

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Categories: Analytical Reagents, Biochemical Reagents Tags: AnalyticalReagent, BiochemicalReagent, FoodGradeTests, HighPurity, PotassiumMetabisulphite, PreservativeAgent, ReducingAgent, SO2Source, SpecialtyChemicals, SulphitingAgent

Description

Potassium Metabisulphite Extra Pure

PRIMARY USES

Food Preservative (E224):
- Widely used in wine, fruit juices, and dried fruits as an antimicrobial and antioxidant.
- Prevents spoilage and discoloration by inhibiting bacteria, molds, and yeasts.
Winemaking and Brewing:
- Acts as a sterilizing agent for musts and fermentation vessels.
- Prevents unwanted fermentation by wild yeasts and preserves flavor and color.
Analytical Chemistry:
- Used as a reducing agent and source of SO₂ gas in laboratories.
- Employed in iodometric titrations and for chlorine removal in water samples.

SECONDARY USES

Water Treatment:
- Used for dechlorination of potable water and wastewater by neutralizing free chlorine and chloramines.
Textile and Leather Industry:
- Functions as a bleaching agent and antichlor after fabric chlorination processes.
Photographic Industry:
- Used in the preparation of developers and fixing solutions as an oxygen scavenger.

PRODUCT KEY FEATURES

1. Basic Identification Attributes

Chemical Name: Potassium Metabisulphite
CAS Number: 16731-55-8
HS Code: 2832.20.00
Molecular Formula: K₂S₂O₅
Synonyms:
- Potassium pyrosulphite
- Dipotassium disulphite
- E224 (as a food preservative)
- Potassium metabisulfite

2. Physical & Chemical Properties

Physical State: Solid (powder or crystalline granules)
Color & Odor: White or slightly yellow; pungent sulfur dioxide-like odor
Boiling Point & Melting Point:
- Decomposes before boiling
- Melting Point: ~190 °C (decomposes)
Density/Specific Gravity: ~2.34 g/cm³
Solubility:
- Soluble in water (65 g/100 mL at 20 °C)
- Insoluble in ethanol
pH Level: Acidic (pH ~3.5–5.0 in 10% aqueous solution)
Vapor Pressure & Volatility: Low volatility; releases SO₂ on contact with acid or moisture
Flash Point: Not flammable
Autoignition Temperature: Not applicable
Viscosity: Not applicable (solid)

3. Safety & Hazard Attributes

Hazard Class (GHS Classification):
- Irritant (skin and eye)
- Respiratory irritant
- May cause allergic respiratory reaction (asthma-like symptoms)
NFPA Ratings:
- Health: 2
- Flammability: 0
- Reactivity: 1
Exposure Limits:
- TLV (ACGIH): 5 ppm (as SO₂)
- OSHA PEL: 5 ppm (as SO₂)
Reactivity:
- Reacts with acids to release sulfur dioxide gas
- Incompatible with strong oxidizers and acids

4. Storage & Handling Attributes

Storage Conditions:
- Store in a cool, dry, and well-ventilated area
- Protect from moisture and light
Incompatible Materials:
- Acids, water (moisture), oxidizers
Container Type:
- Plastic or coated metal containers with moisture-proof seals
Shelf Life & Expiration Date:
- Typically 1–2 years when stored properly
Special Handling Requirements:
- Use gloves, goggles, dust mask or fume hood in bulk handling
- Avoid inhalation and contact with moisture

5. Regulatory & Compliance Attributes

Regulatory Status:
- Approved food additive (E224, preservative)
- Listed in REACH, TSCA, and FDA
Transportation Restrictions:
- Not classified as dangerous goods for transport
Waste Disposal Method:
- Dispose according to local regulations
- Dilute and neutralize before disposal if permitted

6. Environmental & Health Impact

Ecotoxicity:
- Toxic to aquatic organisms in high concentrations
- Risk of oxygen depletion in water due to SO₂ release
Persistence in Environment:
- Not persistent; degrades rapidly in moist air or water
Carcinogenicity/Mutagenicity:
- Not classified as carcinogenic or mutagenic
Biodegradability:
- Decomposes readily in the environment to sulfate

SAFETY HANDLING PRECAUTIONS

SAFETY PRECAUTIONS

Personal Protective Equipment (PPE):

Chemical-resistant gloves (e.g., nitrile)
Protective goggles or face shield
Lab coat or apron
Use in a fume hood or well-ventilated area

Handling:

Avoid inhalation of dust or vapors
Prevent contact with skin, eyes, and clothing
Avoid generating dust
Use only with proper ventilation

Storage:

Store in a cool, dry, and well-ventilated place
Keep container tightly closed
Protect from heat, moisture, acids, and oxidizing agents

FIRST AID MEASURES

Inhalation:

Move person to fresh air immediately
If breathing is difficult, provide oxygen and seek medical attention

Skin Contact:

Remove contaminated clothing
Wash thoroughly with soap and water
Seek medical advice if irritation occurs

Eye Contact:

Rinse thoroughly with water for at least 15 minutes
Seek medical attention promptly

Ingestion:

Rinse mouth thoroughly
Do not induce vomiting
Give water or milk if conscious
Get medical assistance immediately

FIRE FIGHTING MEASURES

Flammability:

Non-flammable, but may release toxic gases

Extinguishing Media:

Use water spray, dry chemical, foam, or CO₂

Hazardous Combustion Products:

Sulfur dioxide (SO₂), potassium oxides

Firefighter Protection:

Wear self-contained breathing apparatus (SCBA)
Avoid inhaling gases or fumes from fire
Control runoff to prevent environmental contamination