Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Benzene, mono-C10-13-alkyl derivs., distn. residues (Heavy Alkylate Bottoms – HAB) is an extremely complex hydrocarbon UVCB. The substance is comprised of 21 different categories of components. The total number of individual components is estimated to be nearly 1000. It has been estimated that there are 210 possible isomers in the category of dialkyl benzenes alone. Standard tests for this endpoint are intended for single substances and are not appropriate for this complex substance. Further complicating the potential bioaccumulation testing of HAB is the extremely low water solubility (WATERNT estimates from 2.61e-03 to 5.83e-07 mg/L) and extremely high log Kow’s (KOWWIN estimates from 7.87 to 19.62) of the individual components. These properties indicate that the HAB components will have little, if any, bioavailability.

Based on read across and QSAR predictions, the weight of evidence is that the substance (Benzene, mono-C10-13-alkyl derivs., distn. residues) will not meet the criteria for a bioaccumulative substance.