Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.
The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 200-753-7 | CAS number: 71-43-2
Phototransformation in air
Administrative data
Link to relevant study record(s)
Description of key information
The atmospheric half life of benzene is calculated to be 5.486 days based on a rate constant of 1.9498 x 10 -12 cm3molecule-1sec-1 and a hydroxyl radical concentration of 1.5E6 OHcm-3 based on the EPISUITE QSAR simulation (US EPA 2012).
Key value for chemical safety assessment
- Half-life in air:
- 13.4 d
Additional information
Information on the atmospheric degradation of benzene was taken from Perry (1977) and the EPISUITE QSAR (US EPA 2012). In Perry 1977, The absolute rate constants for the reaction of OH radicals with a series of aromatic hydrocarbons in the gas phase over the temperature range 296-473 K was determined using flash photolysis-resonance fluorescence technique. Measured data from the author were used to develop rate constants for the reaction of different chemical with hydroxyl radicals. The rate constant has been used to calculate the atmospheric half life of benzene.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
