What is 1,2,4-Trichlorobenzene used for?

1,2,4-Trichlorobenzene is one of the isomeric forms of trichlorobenzene, i.e., compounds with the same molecular weight and chemical formula but with chlorine atoms positioned differently from each other on the benzene ring.1,2,3-Trichlorobenzene and 1,3,5-Trichlorobenzene are colorless solids, while 1,2,4-Trichlorobenzene is a colorless liquid. Trichlorobenzenes are volatile organic compounds (VOC) and are mainly used as solvents and intermediates in the production of other compounds. As solvents, they are used to dissolve specific materials such as oils, waxes, resins and rubber. It is also used in the production of dyes and textiles, and in the past has been used as an insecticide against termites.

1,2,4-Trichlorobenzene is one of 188 chemicals that is designated as a hazardous air pollutant (HAP) under the Clean Air Act. Monitoring data from 2008 indicate that average atmospheric levels in the United States are typically<1 maximum="" levels="">3 ppbv have been observed (EPA 2010a). In the atmosphere, trichlorobenzenes exist primarily in the vapor phase. Vapor-phase trichlorobenzenes are removed from air by reacting with photochemically produced hydroxyl radicals. The half-life for this reaction is approximately 16–38 days, suggesting that they are susceptible to longrange atmospheric transport.  

1,2,4-Trichlorobenzene is toxic to humans, irritating to skin and eyes and may cause severe irritation. Prolonged exposure may cause skin burns. Exposure to high concentrations by inhalation may be hazardous to the lungs, kidneys and liver. Prolonged or repeated exposure, or inhalation of high concentrations for short periods of time is potentially hazardous to the lungs, kidneys and liver. Prolonged or repeated eye contact may cause moderate pain and transient irritation. Prolonged or repeated skin contact may cause moderate irritation and possible systemic effects. Ingestion: May cause liver and kidney damage.

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