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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

The LC50 for fresh water fish is greater than 1000 mg/l.
Similar to fresh water fish tests, the LC50 of sodium chlorate to marine fish was also greater than the highest test concentration of 1000 mg/l.

Key value for chemical safety assessment

LC50 for freshwater fish:
1 000 mg/L
LC50 for marine water fish:
1 000 mg/L

Additional information

Seven acute toxicity studies were found for fresh water fish of which four are valid and one is valid with restrictions (Toussaint et al.; 2001) because the test was not performed according to standard test protocol. One valid test on marine fish was also found.

For all studies LC50s >1000 mg/l were observed. In two studies (Ward and Boeri (1991a) and (1991b)) with Oncorhynchus mykiss and Lepomis macrochirus chemical analysis of the stock solution was performed. The measured concentrations were 105 and 103% of the nominal concentration and therefore the nominal test concentrations were used to derive the endpoints. Except of the stock solution, no chemical analysis was performed during the test. But it was considered that the concentration of sodium chlorate was stable during the test.

The LC50 for fresh water fish is greater than 1000 mg/l.

Similar to fresh water fish tests, the LC50 of sodium chlorate to marine fish (Ward and Boeri, 1991c) was also greater than the highest test concentration of 1000 mg/l.