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Environmental fate & pathways

Hydrolysis

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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 9.2.2.1, does not need to be conducted if the test substance is readily biodegradable.  

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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).