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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

Low  toxicity was demonstrated in Daphnia, freshwater snails and Aedes egypti larvae.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
10 000 mg/L

Additional information

The 24 hour EC50 for urea in Daphnia was reported to be >10000 mg/l; urea is not acutely toxic to daphnids. The 24 hour LC50 values for freshwater snail eggs, juveniles and adults were reported to be 14241 mg/l, 18255 mg/l and 22998 mg/l. Following 48 hour exposure, the LC50value for adults was calculated to be 13477 mg/l.   In another study, the 24 hour LC50values for eggs, juvenile and adult snails were reported to be 13532 mg/l, 24504 mg/l and 26024 mg/l, respectively. Following 48 hours exposure, the LC50value for adults was calculated to be 21412 mg/l. It is concluded that, under normal laboratory conditions, urea displays low molluscicidal activity. The 4 hour LC50 in mosquito (Aedes aegypti) larvae is reported to be 60000 mg/l.