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Ecotoxicological information

Toxicity to terrestrial plants

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In accordance with Column 2 of REACH Annex IX, there is no need to further investigate the effects of this substance in a long-term terrestrial toxicity to higher plants study because:

• The substance is involatile and highly adsorbing and low toxicity was observed in the available pelagic organism and aquatic microorganism tests.

• Based on the aquatic data set, the most sensitive relevant trophic level is invertebrates. A long-term earthworm reproduction test for a closely related salt within the HEDP category is already available and low toxicity was observed (NOEC 500 mg/kg active acid, Noack, 2014).

• The soil hazard category 3 (ECHA guidance part R7(c) table R.7.11-2) applies for this substance. According to the specified approach for soil hazard category 3 substances, if PEC/PNECscreen <1 and no indication of risk from confirmatory long-term soil toxicity testing then no further toxicity testing for soil organisms is necessary, as has been demonstrated for this substance.

• The phosphonate ligand binds strongly and irreversibly to various minerals present in soil and so bioavailability to soil organisms is extremely limited.

Additionally, two reliability 4 studies determine a low level of toxicity for HEDP sodium salts to terrestrial plants.