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Toxicity to terrestrial plants

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Description of key information

For this endpoint a waiver is proposed, and a supporting  study (Reynolds, 1975) although Klimisch 3 scored, is presented.

Key value for chemical safety assessment

Additional information

According to Annex IX this endpoint does not need to be fulfilled if direct and indirect exposure of the soil compartment is unlikely. As phosphoric acid is extremely soluble in water, exposure to soil is deemed irrelevant.

In the available study by Reynolds (1975), the phosphoric acid concentration at which germination of lettuce is inhibited by 50% after 72h of exposure at 29°C is high, namely 16.4±2.45 g/L, inducing a pH as low as 1.3. This gives an indication that terrestrial plants may be able to manage pH values that are lower than normal environmental pH values. Therefore there is currently no need to investigate further the potential toxicity of phosphoric acid to terrestrial plants.

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