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Description of key information

Data is available for acute toxicity to fish, daphnia and algae and chronic toxicity to fish and algae.

The following values are the lowest most reliable data available for derivation of PNECs.

Acute LC50 for fish = 1.07 mg/l

Chronic NOEC (larval survival and growth) for fish = 0.22 mg/l


Acute EC50 (immobilisation) for invertebrates = 19.7 mg/l


EC50 (yield) for algae = 8.05 mg/l

EC10 (yield) for algae = 0.0205 mg/l

Additional information

The acute toxicity of the test substance is investigated in fathead minnow, rainbow trout, goldfish, channel catfish and blue gill (Phipps et al. 1985). The protocol followed was similar to OECD 203 with concomittant analyses of the test substance concentrations. The lowest LC50 was found with the bluegill at a value of 1.07 mg/L.

In a larval survival and growth test with Pimephales promelas, 1-, 4-, and 7-d-old larvae were exposed to benzaldehyde for 7 days. A NOEC of 0.22 mg/L (nominal) (equivalent to 0.12 mg/L, as a measured geometric mean) was reported.

In an acute immobilization test with Daphnia magna (STRAUS), the effects of theBenzaldehydewere determined according to OECD 202.Based on this study, the 48-hour EC50 (immobilisation) value in daphnia is reported to be 19.7 mg/l.

The toxicity of benzaldehyde toPseudokirchneriella subcapitatawas studied in a 72-hour toxicity study according to OECD 201. The 72-hour algal EC50 (growth rate) was 33.1 mg/l and the EC50 (yield) was 8.05 mg/l (mean measured concentration). An EC10 (growth) of 0.0389 mg/l and EC10 (yield) of 0.0205 mg/l were also reported.

In a respiration inhibition test performed according to OECD guideline 209 (Klecka et al. 1985) an EC50 of 759 mg/L (nominal) was derived. A test with musquito larvae (Cheng et al. 2007) showed an LC50 of 45.4 mg/L (nominal).