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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

Only data are available for structural analogue Na3HEDTA, hence read across and molecular weight corrections have been applied.
LC5 (96h): marine species (Scophthalmus maximus) > 738 mg/L. Freshwater species 808 mg/L in Lepomis macrochirus, 372 mg/L in Pimephales promelas and between 862 and 1861 mg/L in Leuciscus idus. For H3HEDTA the lowest LC50 would hence be 276.3/344.2 x 372 = 299 mg/L

Key value for chemical safety assessment

LC50 for freshwater fish:
299 mg/L

Additional information

A number of studies have been done to investigate short term effects on fish of HEDTA, including one study on a marine species (Scophthalmus maximus) (Schlumberger Dowell, 1999) and a number of studies on freshwater species. In the marine species, no mortalities were reported at the maximum exposure concentration of 738 mg/L. Data from the freshwater studies reveal an LC50 of 808 mg/L in Lepomis macrochirus, 372 mg/L in Pimephales promelas and between 862 and 1861 mg/L in Leuciscus idus. These all indicate that acute toxicity to fish is low.