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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

No data are available on the toxicity of trimelltic acid to terrestrial plants.

Key value for chemical safety assessment

Additional information

No data are available to evaluate the toxicity of the substance or its hydrolysis product to terrestrial organisms. A test towards terrestrial organisms should be proposed by the registrant, if the chemical safety assessment indicates the need to further investigate the effects on terrestrial organisms. Annex IX of Regulation 1907/2006 states that in the absence of toxicity data for terrestrial organisms, the equilibrium partitioning method (EPM) may be applied to assess the hazard to terrestrial organisms. The results of the chemical safety assessment indicate that potential exposure would not be expected to result in an unacceptable level of risk for the terrestrial compartment as a result of the following:

- trimellitic anhydride is readily biodegradable and is mineralised rapidly to CO2 in aerobic systems,

- there is no wide dispersive use as the chemical is only used in industrial processes. From industrial processes, the release of trimellitic anhydride into sewage is very limited, if not completely negligible, as the chemical is incorporated into a matrix during polymer manufacturing. In the unlikely case that trimellitic anhydride will reach sewage the anhydride group, which represents the single reactive and toxic functional moiety, rapidly hydrolyses to the respective di-acid. Overall, it is expected that trimellitic anhydride or its hydrolysis product trimellitic acid will not be present in sewage sludge, will not be distributed to sediment and, as a result, direct or indirect exposure of the aquatic and terrestrial compartments are unlikely.

Therefore, no specific testing is required to assess the toxicity of the substance to terrestrial plants.