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Ecotoxicological information

Toxicity to birds

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Description of key information

The need for a long-term reproductive toxicity to birds is waived based on:

- low toxicity based short-term avian toxicity data:

14-day acute toxicity study with Anas platyrhynchos derived a NOEC of >284 mg/kg bw/day as HEDP acid, equivalent to 405 mg/kg bw/day as HEDP-4Na

14-day acute toxicity study with Colinus virginianus derived a NOEC of >284 mg/kg bw/day as HEDP acid, equivalent to 405 mg/kg bw/day as HEDP-4Na;

- mammalian toxicity data are available to assess effects on secondary poisoning and predators

- the substance is non-bioaccumulative

Key value for chemical safety assessment

Additional information

Column 2 of REACH Annex XI states that any need for testing should be carefully considered taking into account the large mammalian dataset that is usually available at this tonnage level. For HEDP-4Na there is no need to carry out further long-term testing with birds for the following reasons:

•             Short-term (14-day) oral toxicity studies are available for the read-across substance (HEDP-H) with Bob White and Mallard Ducks. These showed no mortality or signs of abnormal behaviour or appearance at oral doses up to 284 mg/kg bw (the highest dose tested). The LD50 was therefore >284 mg HEDP-H/kg.  The equivalent LD50 expressed in terms of HEDP-4Na would be >406 mg HEDP-4Na/kg.

•             There is an extensive data base of mammalian toxicity data for HEDP-4Na. Data for oral exposure shows that HEDP-4Na is of low hazard to mammals. The effects seen can generally be attributed to complexation of metals which is a physico-chemical effect and is unlikely to be species-specific. A DNEL for secondary poisoning has been derived based on the available mammalian toxicity data and it is considered that this is also protective of avian species.

•             HEDP-4Na is not bioaccumulative and adsorbes strongly onto sediment and soil. The low bioaccumulation potential and bioavailability of the substance in the environment means that exposure via the food chain is not significant. This is demonstrated by the low RCRs obtained for secondary poisoning.