Registration Dossier
Registration Dossier
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EC number: 231-633-2 | CAS number: 7664-38-2
Endpoint summary
Administrative data
Description of key information
Additional information
All endpoints that are relevant for terrestrial toxicity under REACH are mainly covered by waivers.
Phosphoric acid does not have a high potential for adsorption to soil. It is highly water soluble and will dissociate into hydronium cations and its conjugated base anions. Therefore direct and indirect exposure of the soil compartment is deemed irrelevant. Phosphoric acid will infiltrate and migrate downward due to its high water solubility. In the process it can dissolve some soil materials and be partially neutralized in the process. On reaching the ground table phosphoric acid will be dispersed and diluted. The toxicity studies on soil macroorganisms, terrestrial arthropods, terrestrial plants and soil microorganisms are therefore waived. In addition, the CSR did not show any concern for the soil compartment.
A germination study with lettuce is available (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.
Long-term toxicity to birds is not relevant either and therefore waived, as phosphoric acid has a low potential for bioaccumulation and biomagnification, due to its high water solubility. A short-term study with rock doves (Sterner, 1993) showed only effects on food and water consumption (and consequently on body weight) probably induced by local irritating effects (not confirmed) or by stress due to handling.
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