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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

The range of BCF estimates for the 4 components of the UVCB substance are 0.9 to 190 using the Arnot-Gobas model and 3 to 309 based on the Meylan model. The mono-alkylatednaphthalene component which has the lowest concentration (3.3%) had the highest BCF in models (190 and 309). BCF values for the main components, di-alkylatednaphthalenes and tri-alkylatednaphthalenes, are less than 5.  Using the result calculated for the mono-alkylatednaphthalene component, a worst-case BCF is for this substance is 309.

Key value for chemical safety assessment

BCF (aquatic species):
309 dimensionless

Additional information

The bioaccumulation potential of alkylated naphthalene was estimated using the BCFBAF model which is part of the EPIWIN suite of models developed by the U.S. Environmental Protection Agency. The EPIWIN program calculates BCF values using both the Meylan model and the Arnot and Gobas model. These QSAR models are well established and approved by the US EPA for more than a decade. EPIWIN has been included in the OECD QSAR Toolbox.

As no definite measured log Kow is available for the substance (measurements resulted in a value >8.2, which was the upper limit of validated by the analytical method) the BCF QSAR model was used by allowing the model to calculated the Log Kow from the structure of the substance.

Alkylated naphthalene is a UVCB substance with 4 components. For a comprehensive assessment, the BCF of all 4 substances was determined.

The range of BCF estimates for the 4 components of the UVCB substance are 0.9 to 190 using the Arnot-Gobas model and 3 to 309 based on the Meylan model. The mono-alkylatednaphthalene component which has the lowest concentration (3.3%) had the highest BCF in models (190 and 309). All values are considerably less than the EU PBT criterion of 2000 for BCF.