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Ecotoxicological information

Endpoint summary

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Additional information

Based on the available data there are no effects data for terrestrial (soil-dwelling) organisms. 

Terrestrial testing is not an Annex VIII requirement. However, HEDP and its salts are highly adsorbing to soil and soil mineral substrates. The nature of the adsorption is believed to be primarily due to interaction with inorganic substrate or generalised surface interactions. High adsorption is consistent with similar behaviour seen across other phosphonates, and other common complexing agents such as EDTA. By reference to findings with other similar substances, the binding occurs very rapidly and is effectively irreversible. For environmental fate purposes in exposure assessment this is assessed as a removal process.

The available evidence for HEDP and its salts in respect of terrestrial hazard has been considered in the context of the 'soil hazard category' defined in ECHA Guidance (on Information requirements and chemical safety assessment) part R.7c. HEDP and its salts are considered to be soil Hazard Category 3 due to their high adsorption soil values and low toxicity to aquatic organisms properties.

According to the soil hazard category 3 approach for screening assessment, a confirmatory long-term terrestrial toxicity study is required and this is available, demonstrating low toxicity (NOEC 500 mg/kg active acid, Noack, 2014). Testing for toxicity to additional terrestrial organisms (plants and micro-organisms) is not considered necessary because the risk characterisation ratio (RCR) based on PNECsoil is <1.