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Short-term toxicity to fish

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Short term toxicity to fish:
Neither visible abnormalities nor mortality was observed during a limit test of 96h.
- LC50 (96h) > 100 mg/L
- LOEC (96h) > 100 mg/L
- NOEC (96h) >= 100 mg/L.

Key value for chemical safety assessment

Additional information

Acute toxicity of sodium hypophosphite to zebra fish (Brachydanio rerio) was tested according to the OECD guideline 203 and according to the EU Method C.1. The static freshwater limit test included 1 test vessel and 1 control vessel and total duration was 96h. After 4h, 24h, 48h, 72h and 96h the fish were observed and mortality and visible abnormalities was noted. Furthermore the concentration of the test material as well as the pH, temperature and dissolved oxygen was checked regularly during the test period.

No visible abnormalities or mortality were observed. Hence the LC50 and LOEC at 96h are above 100 mg/L and NOEC for 96h is equal or above 100 mg/L. The exact values of these parameters cannot be quantified due to the absence of toxicity of the test substance at the tested concentration (limit test: 100 mg/L). Furthermore, the measured concentrations of the test substance ranged from 104 to 107% of the nominal value.

Hence, sodium hypophosphite would be classified non hazardous to the aquatic organisms tested according to the CLP regulation (EC) n° 1272/2008.