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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The EC50 for freshwater invertebrates is greater than 1000 mg/l.
The EC50 for marine invertebrates is greater than 1000 mg/l as well.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
1 000 mg/L
EC50/LC50 for marine water invertebrates:
1 000 mg/L

Additional information

Two valid studies with Daphnia magna were found. Both studies were performed under GLP conditions and according to standard protocol. In both studies chemical analyses were carried out, but in the second study (Ward and Boeri (1991d) only analyses on the stock solution were performed. Owusu-Yaw expressed the endpoint in mg chlorate ion per liter, this was transformed to mg sodium chlorate per liter for the purpose of this dossier. The original value was 919.3 mg chlorate/l. The results of the study performed by Owusu-Yaw were heterogeneous and must therefore be considered reliable with restrictions, but nevertheless the results confirm the outcome of Ward and Boeri.

One study valid with restrictions was found for the marine crustacean Mysidopsis bahia (Ward and Boeri, 1991f). This study gave an EC50 greater than 1000 mg/l.

The EC50 for fresh water invertebrates is greater than 1000 mg/l even as the LC50 for marine invertebrates.