Bronte Wells
Benzene is a clear, colourless, volatile, highly flammable liquid with a distinct odour. It is a known human carcinogen and is listed as a hazardous air pollutant by the US Environmental Protection Agency. Benzene is one of many volatile organic compounds (VOCs), which are carbon-based chemicals that evaporate into the air and can react with sunlight to form air pollution. While everyone is exposed to small amounts of benzene daily, prolonged exposure to high levels of benzene can cause excessive bleeding, affect the immune system, and increase the risk of developing cancers, including leukemia.
| Characteristics | Values |
|---|---|
| Definition | Volatile organic compounds (VOCs) are organic chemical compounds that evaporate under normal indoor atmospheric conditions of temperature and pressure. |
| Composition | Any compound of carbon, excluding carbon monoxide, carbon dioxide, carbonic acid, metallic carbides or carbonates, and ammonium carbonate. |
| Sources | Paints, varnishes, waxes, cleaning products, disinfectants, cosmetics, degreasers, hobby products, fuels, building materials, and personal care products. |
| Health Effects | Eye, nose, and throat irritation, headaches, nausea, dizziness, difficulty breathing, liver damage, kidney damage, central nervous system damage, and cancer. |
| Prevention | Increase ventilation when using products that emit VOCs. Keep exposure to a minimum, especially indoors. |
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What You'll Learn
Benzene is a Volatile Organic Compound (VOC)
Benzene is a known human carcinogen, with acute exposure leading to benzene poisoning, and long-term exposure causing harmful effects on bone marrow, reducing red blood cell count and leading to anaemia. It can also affect the immune system, increasing the chance of infection.
Benzene is formed both naturally and through human activities. Natural sources include volcanoes and forest fires, and it is also a natural part of crude oil, gasoline, and cigarette smoke. Human activities that release benzene include smoking tobacco, using solvents for cleaning or hobbies, and industrial processes such as printing, surface cleaning, vehicle coating, and dry cleaning.
The impact of benzene exposure can be reduced by limiting human activities that release the compound and by implementing adequate ventilation methods. It is important to reduce indoor exposure levels as much as possible, as there is no known exposure threshold for the risks of benzene. In the event of a benzene release, emergency teams may instruct people to evacuate the area or "shelter in place". If exposed, individuals should seek fresh air, remove contaminated clothing, and wash any benzene from their skin with soap and water.
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VOCs are indoor and outdoor air pollutants
Volatile organic compounds (VOCs) are organic chemical compounds that easily vaporise at room temperature and enter the environment under normal conditions. They are emitted from thousands of everyday products, including paints, varnishes, waxes, cleaning products, disinfectants, cosmetics, degreasers, hobby products, and fuels. VOCs are of significant concern as both indoor and outdoor air pollutants.
The emphasis on VOCs as indoor pollutants is primarily due to their potential adverse health effects on occupants. Indoor concentrations of VOCs can be up to 2 to 10 times higher than outdoors, with certain activities, such as paint stripping, increasing levels by up to 1,000 times. The health impacts of VOC exposure include eye, nose, and throat irritation, headaches, nausea, dizziness, and difficulty breathing. Long-term exposure to VOCs can lead to more severe issues, including damage to the liver, kidneys, and central nervous system, and some VOCs, such as benzene, are known carcinogens.
The primary concern with VOCs as outdoor pollutants is their ability to create photochemical smog under certain conditions. VOCs are released into the environment from various sources, including industrial activities, mobile sources in urban settings, and the combustion of organic materials and gasoline. Newly industrialised suburban and rural areas are also gaining importance as sources of VOC emissions. BTEX compounds, which include benzene, toluene, ethylbenzene, and xylenes, are a significant group of VOCs that are widely used in industry and derived from gasoline combustion. These compounds can pollute not only the air but also the soil and water.
The classification of VOCs as indoor or outdoor pollutants is defined differently, leading to some confusion. The World Health Organization (WHO) categorises VOCs based on their boiling points, with very volatile organic compounds (VVOCs) having the lowest boiling points and being the most dangerous due to their high volatility. The least volatile compounds found indoors are mostly in solids or liquids, while the majority of VVOCs are gases in the air. The measurement methods used to quantify VOCs can also significantly impact the results, with certain compounds, such as benzene, requiring distinct measurement techniques.
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VOCs are found in many everyday products
Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids. They include a variety of chemicals, some of which may have short- and long-term adverse health effects. Concentrations of VOCs are often significantly higher indoors than outdoors.
VOCs are emitted by a wide array of products, including paints, varnishes, wax, cleaning supplies, disinfectants, cosmetics, degreasers, hobby products, and fuels. These products can release organic compounds during use and, to some degree, during storage. For example, paints, paint strippers, and kerosene for space heaters or gasoline for lawnmowers can emit VOCs. It is recommended to buy only the amount of these products that you will use immediately and to use them in well-ventilated areas.
Graphics and craft materials, such as glues and adhesives, permanent markers, and photographic solutions, also contain organic solvents. Additionally, household furnishings like carpets, upholstered furniture, or items made from composite wood tend to off-gas more VOCs when they are new.
Some VOCs are known or suspected to cause cancer in humans and animals. Exposure to VOCs can lead to symptoms such as eye, nose, and throat irritation, headaches, nausea, dizziness, and difficulty breathing. Long-term exposure can have more severe health impacts, including potential damage to the liver, kidneys, and central nervous system. People with respiratory issues, young children, the elderly, and those sensitive to chemicals may be more vulnerable to the effects of VOCs.
To reduce exposure to VOCs, it is recommended to limit the number of products containing VOCs in your home and to increase ventilation when using such products. Buying products with low-VOC options, following manufacturer instructions, and properly disposing of unused chemicals can also help minimize VOC exposure.
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VOCs can cause serious health problems
Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids. VOCs are emitted by thousands of products, including paints, varnishes, waxes, cleaning products, disinfectants, cosmetics, degreasers, hobby products, and fuels. These products can release organic compounds during use and storage.
VOCs can cause serious short-term and long-term health problems. Concentrations of VOCs are consistently higher indoors than outdoors. The immediate symptoms that some people experience soon after exposure to VOCs include eye, nose, and throat irritation, headaches, nausea, dizziness, and difficulty breathing. Long-term exposure to VOCs can damage the liver, kidneys, and central nervous system, and some VOCs are linked to cancer. They may also worsen symptoms for people with asthma and COPD.
To reduce exposure to VOCs, it is important to increase ventilation by opening doors and windows and using fans to maximize outdoor air circulation. It is also recommended to buy limited quantities of products that contain VOCs and to use them outdoors or in well-ventilated areas. Look for products with ""Low VOCs" labels and opt for solid wood items with low-emitting finishes instead of composite wood.
Some VOCs, such as benzene and methylene chloride, are known to be particularly harmful. Methylene chloride is converted to carbon monoxide in the body and can cause symptoms associated with carbon monoxide exposure. It is important to carefully read labels and follow safety precautions when using products containing these compounds.
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Benzene is used in manufacturing and consumer products
Benzene is a colourless, highly flammable liquid with a sweet smell. It is a natural constituent of petroleum and is one of the elementary petrochemicals. It is also a natural part of crude oil and gasoline.
As a building block chemical, benzene is reacted with other chemicals to produce a variety of other materials and consumer goods. It is used to make other chemicals, including ethylbenzene, cumene, cyclohexane, and nitrobenzene. These chemicals are then used in the manufacture of a variety of materials and plastics, such as polystyrene, ABS, and nylon.
More than half of the entire benzene production is processed into ethylbenzene, which is a precursor to styrene, used to make polymers and plastics. Some 20% of benzene production is used to manufacture cumene, which is needed to produce phenol and acetone for resins and adhesives. Cyclohexane consumes around 10% of the world's benzene production and is primarily used in the manufacture of nylon fibres, which are processed into textiles and engineering plastics. Smaller amounts of benzene are used to make some types of lubricants, rubbers, dyes, detergents, drugs, explosives, and pesticides.
Historically, benzene was used as a significant component in many consumer products, such as Liquid Wrench, paint strippers, rubber cements, spot removers, and other products. However, due to its toxicity, it now finds limited use in consumer items. Nevertheless, benzene is still found in some consumer goods as a building block or intermediate, although the benzene is typically fully reacted in a closed system, with little to no benzene remaining in the finished product.
The biggest consumer country of benzene in 2013 was China, followed by the USA. Toluene is often used as a substitute for benzene due to its lower toxicity, but benzene has made a comeback as a gasoline additive in some nations following the global phase-out of leaded gasoline.
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Frequently asked questions
Volatile Organic Compounds (VOCs) are organic chemical compounds that easily vaporise at room temperature and are released into the environment. They are found in thousands of everyday products, such as paints, varnishes, cleaning products, disinfectants, cosmetics, and fuels.
Yes, VOCs are considered pollutants. They are of concern as both indoor and outdoor air pollutants. Indoors, they can adversely impact human health, with symptoms including eye, nose, and throat irritation, headaches, nausea, dizziness, and difficulty breathing. Long-term exposure can damage vital organs and the central nervous system, and some VOCs are linked to cancer. Outdoors, the EPA regulates VOCs due to their ability to create photochemical smog under certain conditions.
Benzene VOCs are released into the environment from mobile sources in urban settings, particularly in industrial areas. They are also derived from gasoline and organic material combustion, and can be found in the atmosphere, as well as in soil and water. Benzene is used in the manufacturing of synthetic materials and consumer products, including plastics, nylon, insecticides, and paints.
To minimise exposure to benzene and other VOCs, it is recommended to increase ventilation when using products that emit them. Buying limited quantities and using products containing VOCs outdoors or in well-ventilated areas can also help reduce exposure.
