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Environmental fate & pathways

Bioaccumulation: terrestrial

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Description of key information

In accordance with Column 2 adaptation statement of REACH Annex IX, information requirement section 9.3.2, a bioaccumulation study need not be conducted if the subsance has low potential for bioaccumulation (e.g., log Kow < 3). 

Key value for chemical safety assessment

Additional information

The US EPA's KOWWIN model predicts a log Kow of 1.76 for terephthalic acid (TPA, free acid) and the database on which the model is constructed contains a published (public domain) value of 2.00 for TPA (Hansch, C. et al., 1995).

Terephthalate salts are considered to be more environmentally relevant than the parent dicarboxylic acid and these ionised salts are expected to have log Kow values (and bioconcentration potential) lower than that of the parent monomer. Support for this view is provided by read-across from data available for isophthalic acid (IPA), a structural analog of TPA that has an identical KOWWIN-predicted log Kow of 1.76: a measured log Kow value of -2.34 was obtained for IPA in a system buffered to pH 7 (Hatoum & Garthwaite, 1992), conditions that will have resulted in conversion of the parent acid to its salts. All these log Kow values lie below the trigger of 3.0 and terephthalic acid is therefore not expected to exhibit significant bioconcentration or bioaccumulation tendencies.

Studies of bioconcentration/bioaccumulation are not required for TPA.