Bronte Wells
Benzene is a clear, colourless, and volatile liquid with a distinct odour. It is slightly soluble in water and tends to evaporate rapidly at room temperature. Benzene is typically classified as an anthropogenic air pollutant, often associated with industrial paints, adhesives, and cleaning agents. However, there is growing evidence of biogenic sources, including emissions from phytoplankton in remote marine atmospheres. While the impact of benzene as a marine pollutant is not fully understood, it contributes to aerosol formation and has been detected in seawater and the atmosphere over the polar oceans.
| Characteristics | Values |
|---|---|
| Benzene classification | Aromatic hydrocarbon |
| Marine sources | Phytoplankton, plants, outgassing |
| Marine emission contribution | Hydroxyl reactivity, secondary organic aerosol formation, local ozone photochemistry |
| Solubility | Slightly soluble in water (1.78 g/l at 25 °C) |
| Miscibility | Miscible with most organic solvents |
| Solubility in lipids | Yes |
| Melting point | 5.5 °C |
| Boiling point | 80.1 °C |
| Vapour pressure | High (12.7 kPa at 25 °C) |
| Vapour phase residence time | 1 day to 2 weeks |
| Degradation | Reaction with hydroxyl radicals, ozone, nitrate radicals |
| Marine pollutant | Not listed as a severe marine pollutant |
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What You'll Learn
Benzene's solubility in water
Benzene is a natural constituent of petroleum and is one of the elementary petrochemicals. It is a highly flammable liquid with a sweet smell and is partially responsible for the aroma of gasoline. Benzene is classified as a carcinogen and its effects on human health, such as the long-term results of accidental exposure, have been reported on by news organizations.
Benzene is slightly soluble in water (1.78 g/l at 25 °C) and miscible with most organic solvents. Its Henry's Law constant is 550 Pa.m3/mol at 25 °C, indicating its tendency to volatilize into the atmosphere from surface water. The compound has a high vapour pressure (12.7 kPa at 25 °C), causing it to evaporate swiftly at room temperature. Benzene in air predominantly exists in the vapour phase, with residence times varying from one day to two weeks, depending on the environment, climate, and concentration of other pollutants.
The major sources of benzene exposure include tobacco smoke, automobile service stations, exhaust from motor vehicles, and industrial emissions. Ingestion and dermal absorption can also occur through contact with contaminated water. The United States Environmental Protection Agency (EPA) has set a maximum contaminant level for benzene in drinking water at 0.005 mg/L (5 ppb) to prevent benzene leukemogenesis.
Benzene can be formed under specific conditions when benzoic acid (a preservative) and ascorbic acid (Vitamin C) interact. In 2006, four out of 150 soft drink brands surveyed by the UK's Food Standards Agency were found to contain benzene levels above World Health Organization limits. Additionally, in 2005, a benzene leak into the Songhua River in China disrupted the water supply to the city of Harbin, impacting nearly nine million people.
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Marine biogenic sources of benzene
Benzene is an aromatic compound with a single six-member unsaturated carbon ring. It is a clear, colourless, volatile, highly flammable liquid with a distinctive odour. While benzene is typically classified as an anthropogenic air pollutant, there is growing evidence of biogenic sources, such as emissions from plants and phytoplankton.
The Sea2Cloud voyage off the coast of New Zealand revealed the potential for marine sources of benzene that are not currently included in model inventories and global budgets. This finding highlights the increasing diversity in biogenic marine VOC emission profiles and the complexity of ocean-atmosphere interactions.
Additionally, seawater and atmospheric measurements in the Southern Ocean and the Arctic marginal ice zone suggest a marine biogenic source of benzene. These emissions from the polar oceans enhance atmospheric secondary organic aerosol mass and are particularly important for atmospheric chemistry in these regions.
Furthermore, benzene concentrations in seawater have been found to correlate with Chl a concentrations, indicating a biological source for benzene in the upper ocean. Overall, oceanic phytoplankton and marine biogenic emissions are important contributors to the presence of benzene in the marine atmosphere, influencing atmospheric chemistry and aerosol formation.
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Benzene's impact on marine life
Benzene is an aromatic compound with a single six-member unsaturated carbon ring. It is a clear, colourless, volatile, highly flammable liquid with a distinctive odour. Benzene is slightly soluble in water and can evaporate rapidly at room temperature. While it is typically classified as an anthropogenic air pollutant, there is growing evidence that it can also have biogenic sources, such as emissions from plants and phytoplankton.
Marine life, including phytoplankton, can be a source of benzene emissions. Laboratory experiments have confirmed that marine phytoplankton emit benzene, and shipborne measurements have shown that the fluxes of benzene in seawater samples can vary depending on the phytoplankton communities present. These natural sources of benzene contribute to hydroxyl reactivity and secondary aerosol formation in the atmosphere.
The impact of benzene on marine life is complex and not yet fully understood. Benzene is soluble in lipids, which are essential components of cell membranes in marine organisms. Its presence in the water can affect the structure and function of these membranes, potentially disrupting the normal physiological processes of marine life.
Additionally, benzene can have toxic effects on marine organisms, including acute myeloid leukaemia in humans who consume seafood contaminated with benzene. The impact can vary depending on the concentration of benzene, the duration of exposure, and the specific species of marine life.
Reducing human activities that release benzene and improving ventilation are crucial to minimising its impact on marine life. Adequate ventilation methods, such as locating inlets for fresh air on the least polluted side of buildings, can help reduce indoor benzene levels.
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Benzene's contribution to secondary organic aerosols
Benzene is an aromatic compound with a single six-member unsaturated carbon ring. It is a clear, colourless, volatile, highly flammable liquid with a distinct odour. Benzene is slightly soluble in water and can evaporate rapidly at room temperature. Its high vapour pressure allows it to volatilize into the atmosphere from surface water.
Benzene is a known indoor air pollutant, with sources such as cooking stoves, smoking tobacco, paint, adhesives, and solvents. While it is typically classified as an anthropogenic air pollutant, there is growing evidence of biogenic sources, including emissions from plants and phytoplankton.
Additionally, benzene released from marine sources, such as phytoplankton, may contribute to SOA formation in the marine atmosphere. Laboratory experiments and shipborne measurements have confirmed that marine phytoplankton are a source of benzene. The yields of SOA from benzenoid compounds tend to be higher in cleaner (low NOx) air masses, which are typical of remote marine atmospheres.
While benzene's role in SOA formation is not fully understood, it is clear that it can contribute to these aerosols under certain conditions. Further studies are needed to unravel the complex systems involved in the production and atmospheric transformation of marine organic compounds containing benzene.
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Indoor pollution from benzene
Benzene is a colourless, volatile, highly flammable liquid with a distinct odour. It is an aromatic compound with a single six-member unsaturated carbon ring. Benzene is soluble in lipids and has a high vapour pressure, causing it to evaporate quickly at room temperature. It is slightly soluble in water and miscible with most organic solvents.
Benzene is a significant indoor air pollutant, with exposure carrying various health risks. There is no known safe threshold for benzene exposure, and it is considered a Group 1 carcinogen. As a result, it is essential to minimise indoor exposure to benzene as much as possible.
Indoor sources of benzene include human activities such as smoking tobacco, cleaning with solvents, painting, using consumer products, and cooking with specific fuels. Attached garages, especially those connected to the main living environment, can significantly increase indoor benzene levels due to gasoline vapour and the storage of petrol, oil, paint, and hobby supplies.
In developing countries, the problem of indoor benzene pollution is exacerbated by the use of low-efficiency stoves and biofuels, coupled with poor ventilation. The use of kerosene stoves, for example, has been associated with benzene concentrations of 44-167 μg/m3.
To reduce indoor benzene pollution, it is necessary to eliminate or minimise human activities that release benzene. Adequate ventilation is also crucial, especially in modern buildings located near heavy traffic or other major outdoor sources of benzene. Air filtration systems may also help reduce indoor benzene concentrations.
While indoor sources of benzene have been regulated in many countries, outdoor emissions from traffic and industry are less addressed, and their impact on indoor concentrations is not yet fully understood. However, outdoor benzene concentrations, particularly in developing regions, play a significant role in formulating indoor concentrations.
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Frequently asked questions
Yes, benzene is a marine pollutant. It is an aromatic hydrocarbon that is typically classified as an anthropogenic air pollutant.
Benzene is a clear, colourless, volatile, highly flammable liquid with a characteristic odour and a density of 874 kg/m3 at 25 °C.
The sources of benzene in the marine environment can be anthropogenic or biogenic. Anthropogenic sources include activities such as extraction, transportation, and consumption of petroleum products, as well as the use of solvents and paints. Biogenic sources include emissions from phytoplankton and plants.
Benzene contributes to hydroxyl reactivity and secondary organic aerosol formation in the marine atmosphere. It can also impact the local ozone photochemistry and have toxic effects on marine organisms.
To reduce the impact of benzene on the marine environment, it is important to minimise anthropogenic sources of pollution. This includes implementing policies to reduce petroleum pollution, improving production technologies, and reducing the use of benzene-containing products. Additionally, improving ventilation and air quality in indoor spaces can help reduce the release of benzene into the environment.
