Registration Dossier

Ecotoxicological information

Short-term toxicity to fish

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Acute harmful to fish

Key value for chemical safety assessment

Additional information

For risk assessment of ammonium hydrogencarbonate the total topic of ammonia toxicity was regarded. Species mean acute values (SMAV), as given by U.S. EPA (1999) were considered as relevant endpoints. The lowest species mean adjusted total ammonia nitrogen acute value among the 29 fish species acute toxicity results presented by U.S. EPA (1999) was obtained for large rainbow trout (Oncorhynchus mykiss) by Thurston and Russo (1983): LC50 (96 h) at pH 8 = 11.23 mg N/L, i.e. 63.4 mg/L for ammonium hydrogencarbonate. Thurston and Russo (1983) conducted numerous acute toxicity tests with larval, juvenile, yearling, and larger rainbow trout and demonstrated that large rainbow trout were measurably more sensitive than other life stages. Therefore, even if the standard methods use juvenile trout, it appears more relevant to use this species mean acute value of 11.23 mg N/L i.e. 63.4 mg/L ammonium hydrogencarbonate, in order to protect large rainbow trout. For non-salmonids, the lowest species mean adjusted total ammonia nitrogen acute value at pH 8 was obtained for Mountain whitefish (Prosopium williamsoni) : LC50 (96h) at pH 8 = 12.11 mg N/L, i.e. 68.4 mg/L for ammonium hydrogencarbonate.