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Environmental fate & pathways

Bioaccumulation: terrestrial

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Description of key information

Bioaccumulation is not applicable to the target compound itself but to single PAHs, i.e. benzo[a]pyrene (BaP). 

Key value for chemical safety assessment

BCF (terrestrial species):
16 000 L/kg ww

Additional information

The BCF in soil (= 16000) relates to benzo[a]pyrene. According to the Technical Guidance Document (EC 2003, part II), the bioconcentration in earthworm can be described as a hydrophobic partitioning between the pore-water and the phases inside the organism. This equilibrium partitioning approach can be modelled according to the following equation as described by Jager (1998):

BCFearthworm = (0.84 + 0.012Pow )/ROHearthworm

where for ROHearthworm by default a value of 1 (kgwwt/L) can be assumed.

EC (2003) Technical Guidance Document on Risk Assessment in support of Commission Directive 93/67/EEC, Commission Reg. (EC) No. 1488/94 and Directive 98/8/EC. European Commission, Joint Research Centre, European Chemicals Bureau.

According to EC 2003:

Jager T (1998) Mechanistic approach for estimating bioconcentration of organic chemicals in earthworms (Oligochaeta). Environ. Toxicol. Chem. 17, 2080-2090