Registration Dossier
Registration Dossier
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EC number: 258-649-2 | CAS number: 53585-53-8
Endpoint summary
Administrative data
Description of key information
Additional information
Abiotic degradation:
The half-lifes for photodegradation in air were estimated to be 0.395 days [4.736 hrs] (12 -hr day, 1.5E6 OH cm³). Based on the very low water solubility, abiotic degradation in water (hydrolysis) is not relevant. In addition, the substance does not contain any hydrolysable structures.
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.
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