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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

Based on an assessment of the nature of the substance, Thermal cracking oil from blends of rubber, fuel oils and paraffin waxes, steam-stripped, along with an assessment of available figures for bioconcentration factors (BCF) for well-represented, poorly water soluble components of the oil, it is expected that the oil will have a high bioaccumulation potential, with a BCF of 788. This conclusion is supported by the partition coefficient range measured on the substance’s parent oil, Gas oil (polymer-derived), thermal cracked, full range.

Key value for chemical safety assessment

BCF (aquatic species):
788 dimensionless

Additional information

The bioaccumulation potential of the substance was assessed based on the composition of the substance and the molecular structure of its components. Due to the complex nature of the substance, being a UVCB, an assessment has been conducted considering a worst-case scenario by selecting a compound well represented in the UCVB, with the highest potential bioconcentration factor (BCF). It is recognised that certain components of the UVCB are expected to more hydrophilic e.g. caprolactam, however, the bioaccumulation potential of the oil as a whole substance is expected to be driven by the more poorly water soluble fractions of the oil, which collectively form the majority of the substance in terms of percentage w/w. In order to select the component which is considered to contribute most to the bioaccumulative potential of the oil, the UVCB substance was divided into several groups, each group represented by components with similar behavior and effects, and having similar physical and chemical properties. For each fraction, a representative constituent was selected based on its concentration and lipophilic properties, assuming that they will impact on the bioaccumulation potential of the component. Consideration was also given to the partition coefficient of the oil's structurally similar parent oil, Gas oil (polymer-derived), thermal cracked, full range. Based on an assessment of the nature of the substance, Thermal cracking oil from blends of rubber, fuel oils and paraffin waxes, steam-stripped, along with an assessment of available figures for bioconcentration factors (BCF) for well-represented, poorly water soluble components of the oil, it is expected that the oil will have a high bioaccumulation potential, with a BCF of 788. This conclusion is supported by the partition coefficient range measured on the substance’s parent oil, Gas oil (polymer-derived), thermal cracked, full range.