Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.

Diss Factsheets

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

One ready biodegradability tests carried out according to OECD guidelines have been carried out. Based on these results, it can be concluded that benzyltoluene is not readily biodegradable.

The registered substance contains concentration > 0.1 % of a PBT/ vPvB compound. According to the Echa Guidance R11 related to the PBT/vPvB assessment, in that case, the registered substance has to be considered also as a PBT/vPvB substance.

To answer the CCH-D-2114527842-47-01/F about the persistency datagap in the Benzyltoluene dossier, the studies performed on the impurity (Dibenzyltoluene: CAS 53585-53-8) were added in section 5.2.2.

Additional information

Biotic degradation:

Various biodegradation studies demonstrate the Dibenzylbenzene, ar-methyl derivative is inherently biodegradable. An OECD 309 study was conducted with radiolabelled test substance using aerobic natural water with amended solids. The tests were performed at 12°C. The degradation of two relevant compounds of DBT were followed : o,m-DBT and o,o-DTPM and one relevant impurity. The half-life of DBT during the study was determined as 56.0 days for o,m-DBT, > 10,000 days for o,o-DTPM and 32.8 days for the relevant impurity (SFO model).

DBT exhibited moderate biodegradation in two out the three labels o,m-DBT and the relevant impurity, whereas the third label o,o-DTPM was stable with very little break down in the mineralization in surface water of the high dose concentration.

Degradation products were observed throughout the study in two out of the three labels. Unknown metabolites were detected in o,m-DBT and the relevant impurityand was tentatively analyzed by LC-MS/MS.  

Based on this study, o,m-DBT can be considered as persistent and o,o-DTPM can be considered as persistent /very persistent.