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  • Sodium sulfite

Sodium sulfite

Sodium sulfite is an inorganic compound with the chemical formula Na₂SO₃. It exists as a white crystalline powder under normal conditions, readily dissolves in water, and forms an alkaline aqueous solution.
Its core properties and applications focus on two aspects. First, its reducing properties enable it to react with atmospheric oxygen to form sodium sulfate. Consequently, it is commonly used as a food additive (such as a preservative or color fixative) in fruits, vegetables, wine, and other products to prevent oxidative deterioration. Second, its chemical reactivity enables industrial applications such as textile bleaching, dechlorination in papermaking, removal of residual chlorine from water as a reducing agent, and laboratory synthesis of sulfur dioxide.
Sodium sulfite must be stored in sealed containers to prevent oxidation. Accidental ingestion or excessive exposure may irritate mucous membranes, necessitating adherence to safety protocols during handling.
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Email: victoria@juntengchem.com

Product Parameters

AppearanceWhite crystalline powder
Sodium sulfite(Na2 SO3),%97 MIN
Iron content(in Fe)(%)
0.01 MAX
Free base(In Na2CO3)%0.60MAX
Arsenic content (in As)(%)2.0MAX
Heavy metal content(in Pb)(%)10MAX
Packaging25kg/bag or customized according to customer requirements.

Basic Properties


1. Physical Properties

Appearance: White crystalline powder under normal conditions; may occasionally appear granular.

Solubility: Highly soluble in water, forming a clear solution; poorly soluble in organic solvents such as ethanol.

Aqueous Solution Characteristics: Its aqueous solution exhibits weak alkalinity due to hydrolysis of sulfite ions in water.


2. Chemical Properties

Core characteristic: Exhibits strong reducing properties, its most critical chemical trait.

Typical reactions: Readily undergoes oxidation with atmospheric oxygen to form sodium sulfate (Na₂SO₄); also reacts with oxidizing agents (e.g., chlorine gas, hydrogen peroxide) to perform reduction.


3. Stability

It exhibits poor stability and readily oxidizes and deteriorates in air, necessitating sealed storage.

It may also decompose when heated, further highlighting its chemical instability.



Main Applications


1. Food Industry

As a preservative, it inhibits microbial growth and extends the shelf life of foods such as fruits, vegetables, canned goods, and wine.

As a color-retaining agent, it prevents oxidation-induced browning in foods, maintaining the fresh appearance of fruits, vegetables, and other produce.


2. Industrial Production

Used in textiles and papermaking as a bleaching agent or dechlorinator to remove residual chlorine from fabrics and paper, enhancing product quality.

Employed in water treatment as a reducing agent to eliminate residual chlorine in water, reducing corrosion on downstream treatment equipment.


3. Laboratory Applications

Serves as a common chemical reagent for generating sulfur dioxide gas or acting as a reducing agent in specific reactions.

Safety Precautions


1. Storage Safety

Must be stored in a sealed container away from light to prevent oxidation and deterioration caused by exposure to atmospheric oxygen and moisture, which reduces effectiveness.

Keep separate from strong acids (e.g., hydrochloric acid, sulfuric acid) and oxidizing agents (e.g., potassium permanganate) to avoid chemical reactions that produce toxic sulfur dioxide gas.


2. Operational Safety

Wear protective gear including disposable gloves, respirators, and safety goggles during handling to prevent direct skin or mucous membrane contact with powder or solution, which may cause irritation or allergic reactions.

Ensure adequate ventilation in the work area, particularly when dissolving or handling large quantities of sodium sulfite, to prevent accumulation of volatile gases that may irritate the respiratory tract.


3. Emergency Response and Contraindications

If skin or eye contact occurs, immediately flush with copious amounts of running water for at least 15 minutes. Seek medical attention promptly for severe cases.

Non-food-grade sodium sulfite is strictly prohibited for consumption. Even food-grade products must adhere strictly to nationally mandated additive limits to prevent health hazards from excessive intake.

Company Profile

Junteng Chemical is a professional chemical raw materials trading company dedicated to providing customers with one-stop procurement services. Through strict supplier, supply chain, and after-sales management, the company ensures that product quality, transportation, and use meet customer needs. Furthermore, the company's technical team offers customized solutions and support services free of charge.

 

The company has projects in the pharmaceutical, pesticide, petrochemical, construction, food additives, wastewater treatment, adhesives, inks, paints, coatings, plastic and rubber processing, detergent raw materials, fertilizer and textile mills, and more. Junteng Chemical sources products of stable and reliable quality, collaborating with domestic and international companies such as Luxi Group, Weiyuan Chemical, Qilu Petrochemical, Dongying Lihuayi, Yanshan Petrochemical, Sinopec, Shijiazhuang Refinery, Qingdao Petrochemical, Sailboat, Dow Chemical, BASF, South Korea, Taiwan, and Saudi Arabia. Our stable supply, superior product quality, and mature logistics have earned us a wide clientele. We look forward to collaborating with all of you for a mutually beneficial future.

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Company advantages

1

One-Stop Procurement
Platform

We integrate resources across all productcategories, including organic solvents,resins and rubbers, and inorganicchemicals,and strictly control suppliers.supply chains, and after-sales processes toensure stable quality, efficienttransportation,and worry-free use,simplifying your procurement process.

2

Professional Team TechnicalEmpowerment

Equipped with an experienced technicalteam, we provide free personalizedsolutions and professional technicalsupport to customers in varlous industrie,such as pharmaceuticals, petrochemicals,coatings and inks, and sewage treatment,.helping you solve problems and improveefficiency.

3

Global supply ChainSecurity

We work with top domestic and foreignchemical giants such as Luxi Group, QiluPetrochemical, Sinopec, BASF of Germany,and Dow of the United States to establisha stable and reliable high-quality supplynetwork and a mature logistics system toensure timely and safe delivery of
products.

4

Deep Win-Win CooperationConcept

Adhering to the concept of "integrity.immediate action, professionalism,innovation and win-win" and taking"customer success and altruism" as ourmission, we are committed to establishinglong-term strategic partnerships andcreating a better future through excellentproducts and services.

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