CAS number
- 634-90-2
Molecular formula
- C6H2Cl4
Formula weight
- 215.9 g/mol
Family
- Chlorobenzenes
Compound properties list|
| Melting/boiling point | 55 °C | Solid |
| Relative density | 0 g/cm3 | N/A |
| Vapour pressure | 0.06 mm Hg | Low volatility |
| Vapour density | 0 | N/A |
| Solubility in water | 3 mg/L | Low solubility |
| Henry's law constant | 1 x 10-3atm·m3/mol | Moderate volatilization when dissolved |
| log Koc (Depending on soil or sediment characteristics) | 3.5 - 6.0* | Strong adsorption to organic matter |
At 20 0C, 1,2,3,5-tetrachlorobenzene is a solid with low volatility and low solubility.
Once it is dissolved, it is moderately volatile and adsorbs strongly to organic matter. When present
in the soil, it volatilizes and dissolves slowly. In the dissolved phase, 1,2,3,5-tetrachlorobenzene
can reach the water table or drain into a waterway, where it will be diluted before partially
volatilizing. Fragments of 1,2,3,5-tetrachlorobenzene can also be carried into waterways where they
will be deposited at the bottom and slowly dissolve. Once the source has been removed, the adsorbed
phase will take a long time to disappear, liberating contamination in either the gaseous or
dissolved state. The resulting plumes (gaseous and dissolved) are generally small in size.
In Canada, 1,2,3,5-tetrachlorobenzene is considered "toxic", as defined under Paragraph
64(a) of CEPA 1999, and has been added to Schedule 1.
1,2,3,5-tetrachlorobenzene is not currently produced or used in its pure form in Canada
and there is currently no domestic commercial demand for 1,2,3,5-tetrachlorobenzene. Formerly, it
was found in dielectric fluids where it was used to top up polychlorinated biphenyl (PCB)
transformers and in dyestuff carriers. These applications have either been discontinued (dye
carriers) or are being phased out (dielectric fluids). A possible source of release may include
dielectric PCB material still in use. 1,2,3,5-tetrachlorobenzene may be generated when organic
compounds are burned or exposed to a large source of energy in the presence of a chlorine source.
