Do you know how Sodium dithionite (Na2S2O4) can seriously affect worker health? This article will provide a comprehensive overview of the impacts of this chemical in the production environment, including health risks and necessary preventive measures. Discover now to protect yourself and your colleagues!
1. What is Sodium dithionite?
Sodium dithionite, with the chemical formula Na2S2O4, is a chemical compound that plays an important role in many industrial processes. It is also known by other names such as sodium hydrosulphite or sodium dithionite. This compound exists as a white powder or crystals, easily soluble in water.
Regarding its chemical structure, Sodium dithionite contains two sulfur atoms linked together via a double bond, and each sulfur atom is also attached to oxygen and sodium groups. The formula Na2S2O4 reflects its molecular structure, in which sodium (Na) acts as the cation, and dithionite (S2O4) is the main anion.
In industry, Sodium dithionite is mainly used as a strong reducing agent, playing an important role in bleaching, dyeing, and fabric treatment processes, as well as in chemical reactions requiring reducing conditions. However, the use of Sodium dithionite also poses many risks to worker health if not controlled and handled properly. Therefore, understanding this chemical clearly is very important to ensure safety in the working environment.
| No. | Chemical Name in Vietnamese | Chemical Name in English | HS Code | CAS Number | Chemical Formula |
| 1. | Natri thiosunphuric | Sodium dithionite | 28311000 | 7775-14-6 | Na2S2O4 |
See more chemical safety training services according to Decree 113/2017/ND-CP
REGISTER FOR CHEMICAL OCCUPATIONAL SAFETY TRAINING ACCORDING TO DECREE 113
2. What are the sources of Sodium dithionite in the production process?
The chemical compound Sodium dithionite mainly arises in industrial production processes, especially in the textile dyeing and fabric treatment industry. In manufacturing plants, Sodium dithionite is often used as a reducing agent to bleach or reduce color for fabric products. This chemical has the ability to reduce the color of dyes, helping to create brighter and more uniform colors for fabric.
The generation of Sodium dithionite begins with the production of this chemical in powder or crystal form in chemical plants. Sodium dithionite is synthesized from the reaction between sodium bisulfite (NaHSO3) and sulfur dioxide (SO2) under certain conditions. When sodium bisulfite and sulfur dioxide react, Sodium dithionite is created as a by-product.
In addition to its use in the textile dyeing industry, Sodium dithionite is also present in other industries such as paper manufacturing, wastewater treatment, and in some other chemical applications. In these industries, Sodium dithionite can be generated during use or processing, often through chemical reactions or when this chemical is added to treatment solutions.
The generation of Sodium dithionite in the production process is not only related to the direct use of this chemical but also to the processing and storage stages. Therefore, the management and control of Sodium dithionite are very important to minimize exposure risk and protect worker health.

3. Industries that use Sodium dithionite in production
Sodium dithionite is widely used in many different industries thanks to its strong reducing properties. One of the main industries that uses this chemical is the textile dyeing industry. In the fabric production process, Sodium dithionite is used for bleaching and color reduction, helping to create fabric products with uniform and brighter colors. This chemical also plays an important role in removing unwanted dyes during the production process.
The paper industry is another field where Sodium dithionite is used. In paper production, this chemical helps remove colored substances in wood pulp, making the paper whiter and brighter. This process is an important part of creating high-quality paper and ensuring that the final product is not affected by color impurities.
Besides textile dyeing and paper production, Sodium dithionite is also applied in the wastewater treatment industry. In this field, Sodium dithionite is used to reduce polluting compounds in wastewater, helping to clean and treat water before it is discharged into the environment. This chemical helps remove toxic substances and improve water quality.
In addition, Sodium dithionite is also present in some other chemical applications, such as in synthesis reactions and chemical processing. Due to its strong reducing properties, Sodium dithionite is often used in chemical reactions that require special reducing conditions.
The use of Sodium dithionite in these industries brings many benefits, but also comes with potential risks. Therefore, careful management and control of this chemical are very important to ensure worker safety and protect the environment.
4. How does Sodium dithionite affect workers?
Sodium dithionite, although useful in many industrial processes, can cause serious health effects for workers if not used and managed properly. One of the main problems is the risk of skin and eye irritation. When in direct contact with Sodium dithionite, the skin and eyes can become irritated, causing symptoms such as redness, itching, or burning. In cases of long-term exposure or high concentrations, it can lead to dermatitis or more serious damage.
Besides, Sodium dithionite can cause respiratory problems. Vapor or dust from Sodium dithionite, if inhaled, can irritate the respiratory tract, leading to symptoms such as coughing, difficulty breathing, or chest pain. These conditions can be more severe for people with a history of respiratory diseases or long-term exposure to the chemical.
Exposure to Sodium dithionite can also affect the overall health of workers through chemical reactions in the body. Research shows that Sodium dithionite can cause poisoning if absorbed through the digestive tract or skin. This can lead to symptoms such as nausea, dizziness, and headaches. In severe cases, excessive exposure can cause problems with kidney or liver function.
To minimize the health risks associated with Sodium dithionite, compliance with occupational safety regulations is very important. Workers need to be fully equipped with personal protective equipment such as gloves, safety goggles, and dust masks. Good ventilation systems and appropriate preventive measures in the work area also help minimize the risk of exposure to this chemical.
5. Permissible safe concentration of Sodium dithionite for human exposure
Determining the safe concentration of Sodium dithionite is very important to protect worker health and ensure safety in the working environment. Health and occupational safety regulatory agencies often specify the maximum permissible concentration of Sodium dithionite in the air to minimize exposure risk and protect workers from harmful effects.
According to international standards and guidelines from organizations such as OSHA (Occupational Safety and Health Administration) and ACGIH (American Conference of Governmental Industrial Hygienists), the concentration of Sodium dithionite in the air is recommended not to exceed 1 mg/m³. This concentration level is established based on studies of the health effects of Sodium dithionite and is adjusted to ensure that workers do not experience serious health problems.
In addition, guidelines also recommend the use of personal protective equipment when Sodium dithionite concentrations may be higher than the specified level, such as in chemical handling situations or when working in areas with high concentrations. For high-risk work environments, regular monitoring of chemical concentrations and implementation of preventive measures, such as improving ventilation and using filtering devices, are very important.
To ensure safety, companies and factories should implement training programs and periodic health check-ups for workers, while maintaining records of Sodium dithionite concentration levels and the control measures applied. This not only helps ensure that Sodium dithionite concentrations are always within safe limits but also helps raise worker awareness and skills in protecting their own health.

Basically, if working in an industrial environment, it is important to comply with safety standards and limit exposure to Sodium thiosulphuric. Organizations like the Occupational Safety and Health Administration (OSHA) in the United States provide guidelines and safety principles to protect workers from the negative impacts of chemical substances.
6. Measures to minimize the health effects of Sodium dithionite on workers
To minimize the health effects of Sodium dithionite on workers, preventive and control measures must be implemented strictly. First, providing personal protective equipment is an important measure to protect workers from direct contact with the chemical. Necessary protective equipment includes chemical-resistant gloves, safety goggles, and dust masks or vapor filters. This equipment helps prevent Sodium dithionite from contacting the skin, eyes, and respiratory tract, thereby reducing the risk of irritation and other health problems.
Ventilation and air control systems in the work area also play an important role in minimizing the concentration of Sodium dithionite in the air. Providing good ventilation and using exhaust systems can help remove chemical vapors and maintain Sodium dithionite concentrations at safe levels. Installing air filtration devices can be an effective solution to control air pollution in the work environment.
Training and educating workers about the risks associated with Sodium dithionite and how to prevent them is also an essential part. Workers need to be instructed on how to properly use protective equipment, recognize symptoms of exposure to Sodium dithionite, and the steps to take in case of an emergency. Periodic training programs help raise worker awareness and skills, thereby reducing the risk of exposure and health problems.
In addition, implementing periodic maintenance and inspection measures for equipment and chemical handling systems is also very important. Ensuring that personal protective equipment, ventilation systems, and control devices are all functioning effectively will help maintain a safe working environment.
Finally, preventive measures in handling and storing Sodium dithionite are necessary. This chemical should be stored in sealed containers, in dry and cool places to avoid leaks and dispersion in the work environment. At the same time, establishing safe work procedures and adhering to chemical handling regulations are essential to minimize the health effects of Sodium dithionite on workers.
Occupational safety training: Workers need to be trained and educated on the risks and safety measures when working with this chemical. This training should be provided periodically and regularly to ensure understanding and proper compliance with safety rules.
Periodically organize occupational environment monitoring in factories and enterprises, collect and analyze factors harmful to workers, thereby adjusting to reduce hazard levels to prevent occupational diseases for them.
7. Nationwide Occupational Environment Monitoring Center
Nam Viet’s Occupational Environment Monitoring Center is a professional unit specializing in monitoring and measuring the quality of the occupational environment in all provinces across Vietnam. With an experienced team of monitoring specialists, the center uses modern measuring equipment, ensuring accuracy and reliability.
REGISTER FOR OCCUPATIONAL ENVIRONMENT MONITORING SERVICE
In addition to providing monitoring services, the center also supports clients in planning, handling, and tracking occupational environment issues. With the motto “the customer is the center,” the center focuses on customer satisfaction, meets all customer needs, and commits to providing the best solutions for businesses.
With investment in techniques, technology, and human resources, Nam Viet’s monitoring center has been and is becoming one of the reputable units in the field of occupational environment monitoring in Ho Chi Minh City with the following objectives:
- We always value our brand reputation and the quality of our products and services.
- We provide customers with the best and most suitable things possible.
- Along with a team of experienced Masters and Engineers with expertise and a desire to protect the environment and benefit businesses.

- Coming to Nam Viet’s Environmental Monitoring team, your company will receive professional service with experts in the monitoring field. At the same time, you will get the best cost incentives.
8. Occupational Environment Monitoring Quotation
To help businesses conduct occupational environment monitoring professionally and effectively, Nam Viet provides customers with a quality and reasonably priced quotation table for occupational environment monitoring services.
- Our monitoring quotation table provides detailed information about the prices of the monitoring services we offer. This includes costs related to travel, measurement, analysis, and reporting results. Customers can be completely assured of the accuracy and reliability of the monitoring result reports we provide.
- We commit to always offering the most competitive and reasonable prices on the market, and we are always ready to advise and answer any questions about monitoring services quickly and professionally.
- With Nam Viet’s monitoring quotation table, customers can easily choose service packages that suit their needs. We commit to bringing our customers the highest satisfaction with professional service quality.

