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Send EmailSodium Sulfite, Sodium Sulphite, Disodium Sulfite, Anhydrous Sodium Sulfite, E221, 7757-83-7
SODIUM SULFITE (Na₂SO₃ - E221)
PRODUCT IDENTIFICATION INFORMATION
| Parameter | Information |
|---|---|
| Product Name | Sodium Sulfite |
| Chemical Name | Sodium Sulfite (Disodium Sulfite) |
| Synonyms (Turkish) | Sodyum Sülfit, Sodyum Sülfit Susuz, Disodyum Sülfit, Sülfürlü Asit Disodyum Tuzu |
| Synonyms (English) | Sodium Sulfite, Sodium Sulphite, Disodium Sulfite, Sulfurous Acid Sodium Salt, Anhydrous Sodium Sulfite, S-WAT |
| E Number | E221 |
| CAS Number | 7757-83-7 |
| EC Number | 231-821-4 |
| Molecular Formula | Na₂SO₃ |
| Molecular Weight | 126.05 g/mol |
| Appearance | White crystalline powder or granules |
| Odor | Slight sulfur dioxide odor (when moist) |
CHEMICAL STRUCTURE
Sodium Sulfite Structure:
O
||
Na⁺—O—S—O⁻—Na⁺
Structure Description:
-
Ionic compound composed of two sodium cations (Na⁺) and one sulfite anion (SO₃²⁻).
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White, crystalline powder.
-
Strong reducing agent.
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Alkaline in aqueous solution (pH 9.0-10.5).
-
Hygroscopic; slowly oxidizes to sodium sulfate (Na₂SO₄) in air.
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Releases sulfur dioxide (SO₂) gas when in contact with acids.
SECTION 1: CHEMICAL IDENTITY AND DESCRIPTION
| Parameter | Information |
|---|---|
| Product Name | Sodium Sulfite |
| Chemical Name | Sodium Sulfite (Disodium Sulfite) |
| Synonyms (Turkish) | Sodyum Sülfit, Sodyum Sülfit Susuz, Disodyum Sülfit, Sülfürlü Asit Disodyum Tuzu |
| Synonyms (English) | Sodium Sulfite, Sodium Sulphite, Disodium Sulfite, Sulfurous Acid Sodium Salt, Anhydrous Sodium Sulfite, S-WAT |
| E Number | E221 |
| CAS Number | 7757-83-7 |
| EC Number | 231-821-4 |
| Molecular Formula | Na₂SO₃ |
| Molecular Weight | 126.05 g/mol |
| Chemical Class | Inorganic salt; Sulfite; Reducing agent; Food additive |
| Source | Synthetic (reaction of sulfur dioxide with sodium carbonate or sodium hydroxide) |
| Physical State (20°C) | Solid (crystalline powder or granules) |
| Odor | Slight sulfur dioxide odor (when moist) |
| Color | White |
| Taste | Salty, sulfurous taste |
SECTION 2: PHYSICAL AND CHEMICAL PROPERTIES
| Property | Value | Test Method / Note |
|---|---|---|
| Appearance | White crystalline powder or granules | Visual |
| Odor | Slight sulfur dioxide odor (when moist) | Olfactometric |
| Molecular Weight | 126.05 g/mol | Calculated |
| Density (20°C) | ~2.63 g/cm³ | ASTM D4052 |
| Melting Point | > 500°C (decomposes) | DSC |
| Boiling Point | Not applicable (decomposes) | – |
| Solubility in Water (20°C) | 270 g/L (highly soluble) | General Method |
| pH (5% Solution, 20°C) | 9.0 – 10.5 (alkaline) | pH Meter |
| Bulk Density | 0.8 – 1.2 kg/L (depending on form) | – |
| Oxidation Sensitivity | Slowly oxidizes to Na₂SO₄ in air | – |
| Reducing Properties | Strong reducing agent | – |
| Stability | Stable under recommended conditions; Sensitive to air and moisture | – |
| Hygroscopicity | Moderate to high | – |
| Assay (Na₂SO₃) | ≥ 95.0 – 99.0% (grade dependent) | Titrimetric |
| Sodium Sulfate (Na₂SO₄) | ≤ 2.0% | Titrimetric |
| Chloride (Cl) | ≤ 0.01% | Titrimetric |
| Iron (Fe) | ≤ 10 ppm | AAS / ICP |
| Heavy Metals (as Pb) | ≤ 10 ppm | AAS / ICP |
SECTION 3: DENSITY OF AQUEOUS SOLUTIONS (20°C, Approximate)
| Concentration (Weight %) | Density (g/cm³) |
|---|---|
| 1 | 1.008 |
| 5 | 1.045 |
| 10 | 1.095 |
| 15 | 1.147 |
| 20 | 1.202 |
Note: Exact values may vary with temperature and purity.
SECTION 4: SODIUM SULFITE vs OTHER SULFUR COMPOUNDS
| Property | Sodium Sulfite (Na₂SO₃) | Sodium Sulfate (Na₂SO₄) | Sodium Bisulfite (NaHSO₃) | Sodium Metabisulfite (Na₂S₂O₅) |
|---|---|---|---|---|
| CAS Number | 7757-83-7 | 7757-82-6 | 7631-90-5 | 7681-57-4 |
| Molecular Weight | 126.05 g/mol | 142.04 g/mol | 104.06 g/mol | 190.11 g/mol |
| pH (1% Solution) | 9.0-10.5 | 5.2-8.0 | 4.0-5.0 | 4.0-5.0 |
| Reducing Power | Strong | None | Strong | Strong |
| SO₂ Release with Acid | Yes | No | Yes | Yes |
| Oxidation in Air | Slow to sulfate | Stable | Slow | Slow |
| Primary Use | Reducing agent, preservative | Filler, glass, detergent | Preservative, bleaching | Preservative, antioxidant |
| E Code | E221 | – | E222 | E223 |
SECTION 5: MECHANISM OF ACTION
| Property | Description |
|---|---|
| Reducing Agent | Strong reducing agent; Donates electrons to other compounds; Reacts with oxygen (oxygen scavenger); Reduces metal ions; Prevents oxidation reactions. |
| Antioxidant / Preservative | Prevents oxidative browning in foods; Scavenges oxygen; Reduces enzymes (polyphenol oxidase); Maintains color and freshness; Prevents spoilage. |
| Oxygen Scavenger | Reacts with dissolved oxygen: 2Na₂SO₃ + O₂ → 2Na₂SO₄; Removes oxygen from boiler water; Prevents corrosion in pipelines and boilers; Used in water treatment. |
| Chlorine Neutralizer | Reacts with residual chlorine: Na₂SO₃ + Cl₂ + H₂O → Na₂SO₄ + 2HCl; Removes chlorine after bleaching; Used in textile and water treatment. |
| Sulfonation | Adds sulfite groups to organic molecules; Used in chemical synthesis; Produces sulfonated compounds; Used in dye and polymer production. |
| Acid Reaction | Reacts with strong acids to release sulfur dioxide (SO₂) gas: Na₂SO₃ + 2HCl → 2NaCl + SO₂ + H₂O; SO₂ is toxic and irritating; Avoid contact with acids. |
SECTION 6: PRODUCTION PROCESS
Industrial Production Method:
Process Flow:
Sulfur Dioxide (SO₂) + Sodium Carbonate (Na₂CO₃) / Sodium Hydroxide (NaOH) → Reaction → Crystallization → Filtration → Washing → Drying → Milling → Final Product
Step-by-Step Description:
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Sulfur Dioxide Source: Sulfur dioxide is obtained by burning sulfur or as a by-product of smelting operations.
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Reaction: Sulfur dioxide is reacted with sodium carbonate (soda ash) or sodium hydroxide solution.
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With Sodium Carbonate: SO₂ + Na₂CO₃ → Na₂SO₃ + CO₂
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With Sodium Hydroxide: SO₂ + 2NaOH → Na₂SO₃ + H₂O
-
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Crystallization: The sodium sulfite solution is crystallized.
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Filtration: Crystals are separated from the mother liquor.
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Washing: Crystals are washed to remove impurities.
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Drying: Purified crystals are dried at moderate temperature.
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Milling: Dried product is milled to achieve the desired particle size.
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Final Product: White crystalline powder or granules are obtained.
SECTION 7: FUNCTIONAL PROPERTIES
| Property | Description |
|---|---|
| Reducing Agent | Strong reducing agent for chemical and industrial processes; Used in textile dyeing and printing; Used in water treatment; Used in chemical synthesis. |
| Antioxidant / Preservative | Prevents oxidative browning and spoilage in foods; Used as food additive (E221); Maintains color and freshness in dried fruits, wines, and potato products. |
| Oxygen Scavenger | Removes dissolved oxygen from water; Used in boiler water treatment; Prevents corrosion in pipelines and equipment; Used in steam generators. |
| Chlorine Neutralizer | Removes residual chlorine after bleaching; Used in textile processing; Used in water treatment; Prevents damage to fibers and materials. |
| Sulfonation Agent | Introduces sulfite groups into organic molecules; Used in dye and polymer production; Used in chemical synthesis; Produces sulfonated compounds. |
| Reduction in Photography | Used as preservative in photographic developers; Prevents oxidation of developing agents; Extends developer life. |
| Leather Processing | Sulfitation of tanning extracts; Used in leather processing; Improves leather quality. |
SECTION 8: MAIN APPLICATION AREAS
| Industry / Application | Function | Typical Use |
|---|---|---|
| Food Industry (E221) | Antioxidant, preservative, color preservative | Dried fruits (apricots, raisins, apples); Wines (preservative); Potato products (anti-browning); Fruit juices; Seafood; Dosage: 10-100 ppm (varies by application). |
| Pulp & Paper Industry | Delignification, bleaching | Sulfite pulping process (lignin removal); Bleaching of pulp; Not to be confused with Kraft process; Dosage: 5-15% of cooking liquor. |
| Water Treatment | Oxygen scavenger, dechlorination | Boiler water treatment (corrosion prevention); Dechlorination of drinking water; Cooling water treatment; Dosage: 10-50 ppm (dependent on oxygen/chlorine levels). |
| Textile Industry | Chlorine removal, reduction | Post-bleaching chlorine removal; Dyeing reduction processes; Color stripping; Dosage: 1-5 g/L (depending on application). |
| Chemical Industry | Reducing agent, intermediate | Sodium thiosulfate production; Sodium bisulfite production; Sulfonated compound production; Chemical synthesis. |
| Photography | Preservative | Photographic developer solutions; Prevents oxidation of developing agents; Extends developer shelf life. |
| Leather Industry | Sulfitation | Sulfitation of tanning extracts; Leather processing; Improves leather quality and properties. |
| Mining | Flotation agent | Mineral flotation processes; Used for certain ores; Selective flotation. |
| Pharmaceutical | Antioxidant | Injectable solutions (antioxidant); Some pharmaceutical formulations; Preservative in certain products. |
SECTION 9: QUALITY SPECIFICATIONS
| Parameter | Food Grade (E221) | Technical Grade | Pharmaceutical Grade | Test Method |
|---|---|---|---|---|
| Appearance | White crystalline powder | White crystalline powder | White crystalline powder | Visual |
| Assay (Na₂SO₃) | ≥ 95.0% | ≥ 90.0% | ≥ 98.0% | Titrimetric |
| Sodium Sulfate (Na₂SO₄) | ≤ 2.0% | ≤ 5.0% | ≤ 1.0% | Titrimetric |
| Chloride (Cl) | ≤ 0.01% | ≤ 0.02% | ≤ 0.005% | Titrimetric |
| Iron (Fe) | ≤ 10 ppm | ≤ 20 ppm | ≤ 5 ppm | AAS / ICP |
| Heavy Metals (as Pb) | ≤ 10 ppm | – | ≤ 5 ppm | AAS / ICP |
| Arsenic (As) | ≤ 2 ppm | – | ≤ 1 ppm | AAS / ICP |
| Lead (Pb) | ≤ 2 ppm | – | ≤ 1 ppm | AAS / ICP |
| pH (5% Solution) | 9.0 – 10.5 | 9.0 – 10.5 | 9.0 – 10.5 | pH Meter |
| Loss on Drying | ≤ 0.5% | ≤ 1.0% | ≤ 0.3% | Gravimetric |
| Water Insoluble | ≤ 0.05% | ≤ 0.1% | ≤ 0.02% | Gravimetric |
SECTION 10: TOXICOLOGICAL PROFILE
| Parameter | Value |
|---|---|
| Acute Oral Toxicity (LD50, Rat) | ~ 1,500 – 2,500 mg/kg (moderate toxicity) |
| Acute Dermal Toxicity | Low toxicity; May cause mild irritation |
| Skin Irritation | May cause irritation (H315) |
| Eye Irritation | May cause serious eye irritation (H319) |
| Inhalation Toxicity | May cause allergic or asthmatic symptoms (H334); Dust may cause respiratory irritation |
| Chronic Toxicity | May cause respiratory sensitization; Repeated exposure may cause lung damage |
| Carcinogenicity | Not classified as carcinogenic |
| Mutagenicity | Not mutagenic |
| Reproductive Toxicity | No reproductive toxicity at normal levels |
| Allergenicity | May cause allergic reactions in sulfite-sensitive individuals; Asthma-like symptoms possible |
| Environmental Toxicity | May be harmful to aquatic life at high concentrations |
| Special Toxicity Note | May release SO₂ gas when in contact with acids; May cause allergic reactions in sulfite-sensitive individuals; Use appropriate PPE; Avoid inhalation of dust; Keep away from acids. |
SECTION 11: GHS CLASSIFICATION AND LABELING
GHS Classification (in accordance with CLP and UN GHS):
| Hazard Class | Category | H-Statement |
|---|---|---|
| Skin Irritation | Category 2 | H315 |
| Eye Irritation | Category 2 | H319 |
| Specific Target Organ Toxicity (Single) | Category 3 | H335 |
| Respiratory Sensitization | Category 1 | H334 |
Signal Word: WARNING
Hazard Pictograms: GHS07 (Exclamation Mark), GHS08 (Health Hazard)
Hazard Statements (H-Codes):
| Code | Statement |
|---|---|
| H315 | Causes skin irritation |
| H319 | Causes serious eye irritation |
| H334 | May cause allergic or asthmatic symptoms or breathing difficulties if inhaled |
| H335 | May cause respiratory irritation |
NFPA 704 Hazard Classification:
| Health | Flammability | Reactivity | Special |
|---|---|---|---|
| 1 | 0 | 0 | - |
| (Slight health hazard) | (Non-flammable) | (Stable) | (None) |
SECTION 12: PRECAUTIONARY STATEMENTS (P-CODES)
| Code | Statement |
|---|---|
| P261 | Avoid breathing dust/fume/gas/mist/vapors/spray |
| P264 | Wash hands thoroughly after handling |
| P280 | Wear protective gloves/protective clothing/eye protection/face protection |
| P301+P312 | IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell |
| P302+P352 | IF ON SKIN: Wash with plenty of soap and water |
| P304+P340 | IF INHALED: Remove person to fresh air and keep comfortable for breathing |
| P305+P351+P338 | IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present and continue rinsing |
| P332+P313 | If skin irritation occurs: Get medical advice/attention |
| P337+P313 | If eye irritation persists: Get medical advice/attention |
| P342+P311 | If experiencing respiratory symptoms: Call a POISON CENTER/doctor |
| P362+P364 | Take off contaminated clothing and wash it before reuse |
| P403+P233 | Store in a well-ventilated place. Keep container tightly closed |
| P501 | Dispose of contents/container in accordance with local/regional/national/international regulations |
SECTION 13: FIRST AID MEASURES
| Exposure Route | Action to Take |
|---|---|
| Inhalation | Remove to fresh air immediately. If respiratory irritation or asthma-like symptoms develop, seek medical attention. |
| Skin Contact | Wash with plenty of soap and water. Remove contaminated clothing. If irritation persists, get medical attention. |
| Eye Contact | Rinse immediately with plenty of water for at least 15 minutes. Keep eyelids open. Remove contact lenses if present. If irritation persists, seek medical attention. |
| Ingestion | Rinse mouth. Drink plenty of water. Seek medical attention if large quantities are ingested or if feeling unwell. |
SECTION 14: FIREFIGHTING MEASURES
| Parameter | Information |
|---|---|
| Fire Hazard | Non-flammable. May release sulfur dioxide (SO₂) upon heating. |
| Hazards Arising from Fire | Thermal decomposition produces sulfur oxides (SOx) and irritating fumes. |
| Suitable Extinguishing Media | Water spray, CO₂, dry chemical powder, foam. |
| Unsuitable Extinguishing Media | Water jet (may spread dust) |
| Special Protective Equipment | Self-contained breathing apparatus (SCBA), full protective clothing. |
| Special Precautions | Prevent dust from entering sewers and waterways. Avoid dust cloud formation. |
SECTION 15: STORAGE AND SHELF LIFE
| Parameter | Information |
|---|---|
| Storage Conditions | Store in a cool, dry, well-ventilated area; PROTECT FROM MOISTURE and AIR; Keep away from acids and oxidizing agents; Store in tightly closed containers. |
| Container Requirements | Tightly closed, moisture-proof containers (PE-lined bags, HDPE containers, triple-layer paper bags). |
| Materials to Protect From | Moisture, air, acids, strong oxidizing agents (peroxides, permanganates) |
| Shelf Life | 12 – 24 months (in unopened original packaging, under proper storage conditions). |
| Stability Note | Stable under recommended storage conditions; Sensitive to air and moisture; Oxidizes slowly to sodium sulfate; Protect from air and moisture. |
| Special Storage Requirements | Store in a dry, cool place; Avoid exposure to air and moisture; Opened containers must be resealed immediately; Keep away from acids. |
SECTION 16: PACKAGING OPTIONS
| Packaging Type | Quantity | Material |
|---|---|---|
| Triple-Layer Paper Bag | 25 kg | PE-lined kraft paper bag (moisture-proof) |
| Plastic Bag | 5 kg, 10 kg, 25 kg | PE bag (inner-lined, sealed, moisture-proof) |
| Fiber Drum | 20 kg, 25 kg | PE-lined fiberboard drum |
| Plastic Drum | 25 kg, 50 kg | HDPE / Polypropylene (moisture-proof) |
| FIBC / Big Bag | 500 kg, 1000 kg | PE-lined, moisture-resistant PP woven bag |
SECTION 17: TRANSPORT INFORMATION
| Parameter | Information |
|---|---|
| UN Number | Not regulated (non-hazardous) |
| Hazard Class | Not applicable |
| Packing Group | Not applicable |
| ADR/RID | Not regulated |
| IMDG Code | Not regulated (non-hazardous) |
| IATA (Air) | Not regulated (non-hazardous) |
| Marine Pollutant | No |
| Transport Temperature | Ambient temperature; Protect from moisture and heat. |
SECTION 18: REGULATORY STATUS
| Region / Authority | Status |
|---|---|
| European Union | Food additive E221 approved by EFSA; REACH registered; Approved for food and industrial use. |
| USA (TSCA) | Listed (TSCA Inventory) |
| USA (FDA) | GRAS (Generally Recognized as Safe) ; 21 CFR 182.3798; Approved for food use; Labeling required for sulfite-sensitive individuals. |
| Turkey | Food additive E221; Turkish Food Codex compliant; Ministry of Agriculture approval required for food use; KKDIK regulation compliance required. |
| IARC | Not classified (non-carcinogenic) |
| NTP | Not listed |
| OSHA | Regulated as irritant; Hazard Communication Standard. |
| California (Prop 65) | Not listed |
| Halal | Yes (with certification) |
| Kosher | Yes (with certification) |
| Vegan | Yes (synthetic, no animal ingredients) |
SECTION 19: OTHER NAMES AND SYNONYMS
| Type | Name |
|---|---|
| Turkish Names | Sodyum Sülfit, Sodyum Sülfit Susuz, Disodyum Sülfit, Sülfürlü Asit Disodyum Tuzu |
| English Names | Sodium Sulfite, Sodium Sulphite, Disodium Sulfite, Sulfurous Acid Sodium Salt, Anhydrous Sodium Sulfite, S-WAT |
| E Number | E221 |
| CAS Number | 7757-83-7 |
| EC Number | 231-821-4 |
| HS Code | 2832.10 |
SECTION 20: SUMMARY TABLE
| Parameter | Value |
|---|---|
| Product | Sodium Sulfite (Na₂SO₃ - E221) |
| CAS Number | 7757-83-7 |
| E Number | E221 |
| Molecular Formula | Na₂SO₃ |
| Molecular Weight | 126.05 g/mol |
| Appearance | White crystalline powder or granules |
| Density (20°C) | ~2.63 g/cm³ |
| Solubility in Water (20°C) | 270 g/L |
| pH (5% Solution) | 9.0 – 10.5 |
| Primary Functions | Reducing agent, antioxidant, preservative, oxygen scavenger, chlorine neutralizer |
| Main Application Areas | Food (E221), pulp & paper, water treatment, textile, chemical, photography, leather, mining |
| Shelf Life | 12 – 24 months |
| GHS Signal Word | WARNING |
| UN Number | Not regulated |
| Special Properties | Strong reducing agent; Alkaline; Oxidizes in air; Releases SO₂ with acids; Food additive; GRAS; FDA approved; Sulfite allergy caution. |
SECTION 21: CRITICAL WARNINGS AND BEST PRACTICES
CRITICAL WARNINGS:
-
REDUCING AGENT: Strong reducing agent; Reacts with oxidizing agents (fire/explosion hazard if mixed).
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RELEASES SO₂ WITH ACIDS: Reacts with strong acids to release sulfur dioxide (SO₂) gas (toxic and irritating). DO NOT MIX WITH ACIDS.
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OXIDIZES IN AIR: Slowly oxidizes to sodium sulfate in air; Protect from air and moisture.
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HYGROSCOPIC: Absorbs moisture from air; Store in tightly closed containers.
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ALLERGY WARNING: May cause allergic reactions in sulfite-sensitive individuals; Asthmatic symptoms possible (H334).
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SKIN AND EYE IRRITANT: Causes skin and eye irritation (H315, H319); Use appropriate PPE.
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RESPIRATORY IRRITANT: May cause respiratory irritation (H335); Avoid inhalation of dust.
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FOOD GRADE: E221 approved; Food-grade material required for food applications.
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LABELING: Products containing sulfites must be labeled for sulfite-sensitive individuals (FDA/EU).
BEST PRACTICE RECOMMENDATIONS:
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Food Industry (E221): Use as antioxidant and preservative; Dosage: 10-100 ppm (varies by application); Dried fruits, wines, potato products; Dissolve in water before use; Food-grade material required; Follow regulatory limits.
-
Pulp & Paper: Use as delignification agent; Dosage: 5-15% of cooking liquor; Sulfite pulping process; Not to be confused with Kraft process.
-
Water Treatment: Use as oxygen scavenger and dechlorinator; Dosage: 10-50 ppm; Boiler water treatment; Cooling water treatment; Corrosion prevention.
-
Textile Industry: Use as chlorine neutralizer; Dosage: 1-5 g/L; Post-bleaching chlorine removal; Dyeing reduction processes.
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Handling: Use in well-ventilated areas; Avoid dust formation; Use dust masks (N95/FFP2) when handling powder; Use gloves and safety goggles; Avoid contact with acids.
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Personal Protective Equipment: Dust mask (N95/FFP2) if dust is generated, safety goggles, chemical-resistant gloves, protective clothing.
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Hygiene: Wash hands thoroughly after handling; Do not eat, drink, or smoke while using; Remove contaminated clothing and wash before reuse.
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Storage: Store in tightly closed, moisture-proof containers; Store in cool, dry, well-ventilated area; Protect from moisture and air; Keep away from acids and oxidizing agents; Opened containers must be resealed immediately; Shelf life: 12-24 months under proper conditions.
-
Spill Management: Sweep or vacuum (HEPA) and place in suitable sealed container; Avoid dust formation; Do not allow entry into drains or waterways; Avoid contact with acids.
-
Disposal: Dispose of in accordance with local, regional, and national regulations; Non-hazardous waste; Can be incinerated or dissolved and neutralized (check local regulations).
DETECTION METHODS:
| Method | Description | Advantages | Disadvantages |
|---|---|---|---|
| Titrimetric (Iodometric) | Iodine-thiosulfate titration | Simple, accurate, standard method | Requires careful technique |
| Titrimetric (Acid-Base) | Neutralization with standard acid | Simple | Not specific for sulfite |
| Ion Chromatography | Quantitative analysis of sulfite | High sensitivity, accurate | High cost, requires expertise |
| AAS / ICP | Trace metal analysis | High sensitivity, accurate | High cost, requires expertise |
| pH Meter | pH of solution | Simple, rapid | Indicative only |
| SO₂ Detection | Colorimetric or gas detection tubes | Specific for SO₂ release | Requires specialized equipment |
SODIUM SULFITE vs ALTERNATIVES COMPARISON:
| Product | Chemical Name / E Code | Application | Strength | Weakness | Status |
|---|---|---|---|---|---|
| Sodium Sulfite (E221) | Na₂SO₃ | Food, water treatment, textile | Strong reducing, effective preservative | Sulfite allergy, oxidizes in air | Widely approved |
| Sodium Metabisulfite (E223) | Na₂S₂O₅ | Food, preservative, bleaching | More stable, higher SO₂ content | Stronger odor | Widely approved |
| Sodium Bisulfite (E222) | NaHSO₃ | Food, preservative | Similar properties | Lower pH, more acidic | Widely approved |
| Sodium Sulfate | Na₂SO₄ | Filler, glass, detergent | Stable, cheap | Not a reducing agent | Widely approved |
| Ascorbic Acid (E300) | C₆H₈O₆ | Food, antioxidant | Natural, safe | Less reducing power | Widely approved |
LEGAL DISCLAIMER:
The information provided in this document is based on our current knowledge and experience and is presented in good faith. However, as all conditions of use are beyond our control, it does not constitute a binding specification or warranty. This Technical Data Sheet is for informational purposes only. Users are responsible for testing the suitability for their own applications and for complying with all local, regional, and national regulations. For complete safety, storage, use, handling, waste, and regulatory compliance information, please refer to the official Safety Data Sheet (SDS/MSDS) provided by the manufacturer/supplier. Sodium sulfite is a reducing agent that may release SO₂ when in contact with acids; allergic reactions possible in sulfite-sensitive individuals; use appropriate safety measures.
