Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Adsorption / desorption:

Substance is a hydrocarbon UVCB. Standard tests for this endpoint are intended for single substances and are not appropriate for this complex substance. However, this endpoint is characterized using quantitative structure property relationships for representative hydrocarbon structures that comprise the hydrocarbon blocks used to assess the environmental risk of this substance with the PETRORISK model (see Product Library in PETRORISK spreadsheet attached to IUCLID Section 13).

 

Distribution modelling:

The distribution of oxidised bitumen in the environmental compartments, air, water, soil, and sediment, has been calculated using the PETRORISK Model. Compositional analysis of oxidised bitumen using two-dimensional gas chromatography indicates a greater amount of quantifiable constituents compared to other types of bitumen. Therefore (Q)SAR data from oxidised bitumen can be used as a conservative read across for the bitumen category. Based on the regional scale exposure assessment, the multimedia distribution of the substance is 36.22% to air, 0.07% to water, 38.79% to sediment and 24.91% to soil. Distribution modelling results are included in the ‘Multimedia distribution modelling results’ tab in the PETRORISK spreadsheet attached to IUCLID Section 13 (Redman et al., 2010a).

 

Other distribution data

In a series of static and dynamic leaching tests (KS = 2), bitumen was found to be highly insoluble in water and when used in asphalt creates a matrix that locks in any potentially toxic components such as PAHs. PAH levels were below 5 ng/L (Brandt and De Groot, 2001).