Mixed LOF

Bioaccumulation: aquatic / sediment

Link to relevant study record(s)

Reference

Endpoint:

bioaccumulation in aquatic species: fish

Type of information:

(Q)SAR

Adequacy of study:

key study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

results derived from a valid (Q)SAR model and falling into its applicability domain, with adequate and reliable documentation / justification

Justification for type of information:

Standard bioaccumulation studies are not applicable to petroleum UVCB substances, therefore in accordance with Annex XI Section 1.3 testing is not scientifically necessary and the endpoint has been fulfilled using QSAR calculations for relevant constituents. Full justifications for this QSAR are presented in 'Attached justification', but in brief these are justified because:
- the results are obtained from a QSAR model whose scientific validity has been established
- petroleum substances fall within the applicability domain of the QSAR model
- results are adequate for the purposes of risk assessment
- adequate and reliable documentation is provided

Qualifier:

no guideline required

Principles of method if other than guideline:

- Software tool(s) used including version: EPISuite v4.10
- Model(s) used: BCFBAF v3.01
- Model description: see field 'Attached justification'
- Justification of QSAR prediction: see field 'Attached justification'

Lipid content:

5 %

Temp.:

20 °C

pH:

7

Type:

BCF

Value:

>= 52.7 - <= 1 498 L/kg

Basis:

whole body w.w.

Remarks:

5% lipid normalized

Calculation basis:

kinetic

Remarks on result:

other: See Remarks

Remarks:

Multiple results Calculated BCF for constituents of this substance range between 52.7 – 1498 L/kg. It should be borne in mind that this is the full range of predicted values, and that this may be misleading or unrepresentative of the properties of the UVCB substance as a whole. The range sho uld therefore be treated with caution and not taken out of context. The 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 characterised using quantitative structure p roperty relationships for representative hydrocarbon structures that comprise the hydrocarbon block s used to assess the environmental risk of this substance with the PETRORISK model (see Product Library in PETRORISK spreadsheet attached in IUCLID section 13). For purposes of PBT assessm ent, the substance has been assessed using a combination of QSAR predictions and confirmat ory experimental testing for representative constituents using a hydrocarbon block approach. For details see report titled 'Evaluation of PBT for Petroleum Substances' in IUCLID section 13.

Description of key information

Standard bioaccumulation studies are not applicable for petroleum UVCB substances. In accordance with Annex XI Section 1.3 testing is not scientifically necessary and the endpoint has been fulfilled using QSAR calculations for relevant constituents. Full justifications for this QSAR are presented in 'Attached justification', but in brief these are justified because:

-the results are obtained from a QSAR model whose scientific validity has been established

-petroleum substances fall within the applicability domain of the QSAR model

-results are adequate for the purposes of risk assessment

-adequate and reliable documentation is provided

Additional information

The substance is a hydrocarbon UVCB. Standard bioaccumulation studies for this endpoint are intended for monoconstituent substances and are not applicable for this complex substance.However, this endpoint is characterised 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 in IUCLID section 13).

For the oxygenated fraction (0 - 5%, 1% typical), experimental OECD 305 data exists for C10, C11, and C13 iso-alcohols (EC 271 -233 -5, 271 -360 -6, and 271 -235 -6). Measured BCF and BMF values range from 8.4 - 69 L/kg-ww (C10, C11, C13) and <= 0.016 (C10, C13), respectively. These values support a very low potential for bioaccumulation. These values can be used as conservative read-across to lower molecular weight alcohols (C7 - 9), as they are less hydrophobic and are more rapidly metabolized within the organism.

As a result, this fraction is not further evaluated for bioaccumulation potential in aquatic and sediment organisms.