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Description of key information

In accordance with Column 2 adaptation statement of REACH Annex VIII, hydrolysis as a function of pH, information requirement, does not need to be conducted if the test substance is readily biodegradable.  

Key value for chemical safety assessment

Additional information

Since terephthalic acid has been shown to be readily biodegradable (Point 5.2.1), a study of its hydrolysis is not required. Under environmental conditions, hydrolysis is unlikely to make a significant contribution to the dissipation of terephthalic acid (or its salts), compared to the rate of its removal by biodegradation.

A confirmatory indication of this is provided by the analytical data from a study of the effect of terephthalic acid on the growth of the unicellular aquatic alga Pseudokirchneriella subcapitata (Government of Japan, 2003d): the initial measured exposure concentration of 19.0 mg TPA/L remained unchanged over the course of the static, 72 -hour incubation at pH 7.8 +/- 0.3. These data (DT50 > 3 days) provide evidence that TPA is not prone to rapid hydrolysis in the aquatic environment. Ready biodegradability test data, on the other hand, show > 60% mineralisation (CO2 production) within 5 days when TPA was dosed at 10 and 20 mg/L (Lebertz, 1991a).