Phosphorus trichloride (PCl₃) is a dangerous chemical common in industry. But did you know it can seriously affect the health of workers in manufacturing plants? Let’s explore the impact of PCl₃ and how to protect your health in this article!
1. What is Phosphorus trichloride (Phosphorous trichloride)?
Phosphorus trichloride (PCl₃) is a chemical compound with the formula PCl₃, formed from one phosphorus atom and three chlorine atoms. It is a colorless liquid with a characteristic pungent odor and is highly corrosive. PCl₃ is soluble in organic solvents such as benzene and chloroform but is insoluble in water.
Phosphorus trichloride is produced mainly through the reaction between phosphorus (P) and chlorine (Cl₂) under high-temperature conditions. This process produces PCl₃ and a large amount of heat. This chemical is highly reactive and can decompose upon contact with water, forming phosphoric acid (H₃PO₄) and hydrochloric acid (HCl).
With its special chemical properties, PCl₃ is widely used in the chemical industry, especially in the production of phosphorus compounds, such as phosphates, water treatment compounds, and plastics. However, the corrosive and toxic nature of PCl₃ requires workers to be extremely cautious when in contact with it during production.
| No. | Chemical Name in Vietnamese | Chemical Name in English | HS Code | CAS Number | Chemical Formula |
| 1. | Photpho triclorua | Phosphorus trichloride (Phosphorous trichloride) | 28121200 | 7719-12-2 | PCl3 |
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2. Where does Phosphorus trichloride (Phosphorous trichloride) originate from in the production process?
During the production process, this compound usually arises from reactions between phosphorus and chlorine. Specifically, phosphorus is heated in a furnace at high temperatures, then reacted with chlorine. This process produces phosphorus trichloride gas and a large amount of heat. In addition, when phosphorus is processed in dry environments or when mixed with other substances like hydrochloric acid, phosphorus trichloride can also be generated. In manufacturing plants, this gas can be emitted from processing equipment systems, chemical storage tanks, or production areas, especially when chemical reactions are not strictly controlled.

3. Industries that use Phosphorus trichloride (Phosphorous trichloride) in production
Phosphorus trichloride is widely used in many industries, especially in chemical manufacturing. The petrochemical industry is one of the main sectors, where this compound is used to produce phosphates, phosphoric acid, and other phosphorus compounds, which have applications in the production of fertilizers and additives.
In addition, phosphorus trichloride also plays an important role in the plastics industry, particularly in the production of various plastics and plasticizers from phosphorus compounds. It is also used in the pharmaceutical industry, where it is used to synthesize drugs and organic chemicals.
Besides, this compound is also used in the pesticide manufacturing industry to create crop protection compounds. In the field of water treatment, phosphorus trichloride is also used to adjust the properties of water, helping to remove impurities and improve water quality.
4. How does Phosphorus trichloride (Phosphorous trichloride) affect workers?
When workers are exposed to phosphorus trichloride, especially in production environments, they can face many health risks. This compound is highly corrosive; when in contact with the skin, it can cause burns, dermatitis, and severe irritation. When inhaling the vapor or dust of phosphorus trichloride, workers may experience respiratory problems, including coughing, shortness of breath, chest pain, and pneumonia.
In particular, if exposure is prolonged or not properly protected, phosphorus trichloride can cause serious damage to the respiratory system and other internal organs. In severe cases, long-term exposure to this compound can lead to liver failure, kidney failure, or even death from poisoning.
In addition to the immediate effects, continuous exposure to phosphorus trichloride can cause chronic diseases such as chronic bronchitis, pharyngitis, or problems related to the nervous system. For this reason, workers must adhere to safety measures such as wearing personal protective equipment, using adequate ventilation systems, and implementing other preventive measures when working with this chemical.
5. Permissible safe concentration of Phosphorus trichloride (Phosphorous trichloride) for human exposure
The safe concentration for human exposure to phosphorus trichloride has been determined and strictly regulated by health and occupational safety agencies. The U.S. Occupational Safety and Health Administration (OSHA) sets the maximum permissible concentration of phosphorus trichloride in the air at 0.5 ppm (parts per million) over an 8-hour workday. This level is considered the safety threshold to protect workers from the dangerous effects of this compound.
Studies have shown that concentrations exceeding this level can cause serious health effects, especially respiratory and skin problems. In addition, health organizations recommend that the concentration of PCl₃ in the air should not exceed 1.5 mg/m³ in a workday, to minimize the risk of injury to the worker’s body.
This means that in a production environment, factories must maintain the concentration of phosphorus trichloride in the air at the lowest possible level by using effective ventilation systems and other control measures, protecting the health of workers throughout the work process.

On a basic level, if working in an industrial environment, adhering to safety standards and limiting exposure to Phosphorus trichloride is important. 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 Phosphorus trichloride (Phosphorous trichloride) on workers
To minimize the health effects of phosphorus trichloride on workers, safety measures must be strictly implemented throughout the production process. First, the use of personal protective equipment is extremely important. Workers should wear gloves, safety goggles, and respirators to prevent direct contact with this compound, as well as use sealed, corrosion-resistant protective clothing to protect the body.
Besides, the ventilation and air control system in the work area must be ensured to operate effectively, helping to reduce the concentration of phosphorus trichloride in the air. Manufacturing plants need to install exhaust systems, ventilation fans, and air filtration devices to remove toxic gases and maintain clean air in the work environment.
In addition to personal protective and ventilation measures, training and raising awareness for workers about the risks and prevention methods when working with phosphorus trichloride is very important. Workers need to be trained on emergency handling techniques, how to provide first aid when exposed to this chemical, and basic health protection measures.
Finally, production facilities need to conduct periodic checks on the concentration level of phosphorus trichloride in the air, ensure compliance with occupational safety regulations, and implement appropriate preventive measures if there are signs of exceeding the permissible level.
Occupational safety training: Workers need to be trained and educated on the risks and safety measures when working with this type of 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 the level of hazard to prevent occupational diseases for them.
7. National Occupational Environment Monitoring Center
Nam Viet’s Occupational Environment Monitoring Center is a professional unit for monitoring and measuring the quality of the working environment across all provinces in Vietnam. With a team of experienced 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 assists 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 is committed to providing the best solutions for businesses.
With investment in technology, engineering, and human resources, Nam Viet’s monitoring center has become 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 our customers with the best and most suitable options possible.
- With a team of experienced Masters and Engineers with a desire to protect the environment and benefit businesses.

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

