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Ecotoxicological information

Toxicity to terrestrial plants

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Description of key information

The study on toxicity of phthalic acid towards terrestrial plants cannot be used for assessment. Therefore, the equilibrium partitioning method (EPM) is applied to assess the hazard to soil organisms.

Key value for chemical safety assessment

Additional information

For phthalic acid only one reliable toxicity test on terrestrial plants is available. Reynolds (1975) examined pH restraints on lettuce (Lactuca sativa) fruit germination on agar media treated with the test substance. An EC50 of 731 mg/l at pH 2.80 was determined.

The scope of the terrestrial effects assessment under the adopted REACH regulation is restricted to soil organisms in a narrow sense and does not actually include adverse effects on soil functions that are only indirectly linked to the biota in soils. The test described above, was designed assessing the influence of phthalic acid on germination and growth on agar treated with the substance. As no soil was used in the test standardisation of soil effect data to given soil parameters is not possible. Further, converting the result to an appropriate dimension is not applicable. Therefore the result should not be used for the hazard assessment. Nevertheless, the obtained effect values indicate that phthalic acid is of low toxicity to terrestrial plants.