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Environmental fate & pathways

Bioaccumulation: aquatic / sediment

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Description of key information

BCF have been calculated using  for various representative components of these streams.  Using a log Kow  range of 2.68 to 6.96 the calculated values range from 26 to 18000 .  The latter figure  comes from a C15 Olefin, all other BCF values for the category fall within the range 26-174

Key value for chemical safety assessment

Additional information

A measured BCF is not available for any streams in this category. As the log Kow of some category members is >3 the bioaccumulation endpoint cannot be waived. However, ECHA's Guidance on Information Requirements and Chemical Safety Assessment R7c Endpoint Specific Guidance (2008) indicates that before commissioning a new vertebrate test alternative sources of data on the bioaccumulation potential of a chemical should used.

BCF values have been calculated from representative substances. Nonpolar substances have been shown to have a linear relationship between log Kow and BCF in the log Kow range 1 -6. Several QSAR have been developed that calculate the BCF of non-polar, hydrophobic compounds on the basis of their log Kow (e. g. Veith et al, 1979 and USEPA, 2008). BCFBAF v3.0 (USEPA 2008) has been used to calculate the BCF for respresentative substances of the streams since most of the substances fall within the applicability domain of the model and this has been used as the key study. The method of Veith et al (1979) was used to calculate the BCF as a supporting study Parabolic method has been used to calculate a BCF for Substances with a log Kow >6.