Carbon tetrachloride
Carbon tetrachloride (CCl4), also known as tetrachloromethane, is a colorless heavy organic liquid with a sweet aroma. Historically, it has been used in fire extinguishers, as a precursor to refrigerants, and in various industrial applications. However, due to its health and environmental impact, the use of carbon tetrachloride has been greatly reduced.
Introduction
Carbon tetrachloride (CCl4) is a volatile, colorless liquid that was once widely used in numerous commercial applications. Its heavy vapor and non-flammability made it particularly useful in fire extinguishers and in the creation of refrigerants.[1]
Physical and Chemical Properties
CCl4 is a tetrahedral molecule, with carbon at the center and four chlorine atoms surrounding it. It is nonpolar and has a density greater than that of water. Carbon tetrachloride is poorly soluble in water but can dissolve in many organic solvents.[2]
Historical Uses
Carbon tetrachloride was widely used in fire extinguishers and in dry cleaning. In addition, it served as a precursor to refrigerants. However, due to its toxicity and the damage it causes to the ozone layer, these uses have been largely phased out.[3]
Health Effects
Carbon tetrachloride is a potent liver toxin when ingested, inhaled, or absorbed through the skin. It can cause nausea, headache, confusion, and in severe cases, can lead to liver, lung, and kidney damage, coma, or even death. Long-term exposure may result in chronic diseases such as liver cirrhosis or cancer.[4]
Environmental Impact
When released into the atmosphere, carbon tetrachloride can contribute to the depletion of the ozone layer. It is one of the substances regulated under the Montreal Protocol, an international treaty designed to protect the ozone layer.[5]
Regulations and Restrictions
The production and use of carbon tetrachloride have been heavily regulated due to its health and environmental impact. In many countries, it is now primarily used in small amounts for scientific research and for specific industrial processes that recapture and recycle it.[6]
Safety and Handling
Due to its toxic nature, it is crucial to handle carbon tetrachloride with appropriate safety measures. This includes using protective equipment and ensuring proper ventilation. In case of exposure, immediate medical attention should be sought.[7]
See Also
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- ↑ Haynes, W.M., et al. (2014). CRC Handbook of Chemistry and Physics. CRC Press.
- ↑ Housecroft, C.E., & Sharpe, A.G. (2012). Inorganic Chemistry (4th ed.). Pearson.
- ↑ Montzka, S.A., et al. (2011). Small interannual variability of global atmospheric hydrochlorofluorocarbons and hydrofluorocarbons and their climate forcing. Atmospheric Chemistry and Physics, 11(13), 6655–6663.
- ↑ ATSDR. (2005). Toxicological Profile for Carbon Tetrachloride. Agency for Toxic Substances and Disease Registry.
- ↑ Ravishankara, A.R., et al. (2009). Nitrous oxide (N2O): The dominant ozone-depleting substance emitted in the 21st century. Science, 326(5949), 123–125.
- ↑ UNEP. (2014). Handbook for the Montreal Protocol on Substances that Deplete the Ozone Layer (10th ed.). United Nations Environment Programme.
- ↑ NIOSH. (2010). Pocket Guide to Chemical Hazards. National Institute for Occupational Safety and Health.
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Contributors: Prab R. Tumpati, MD
