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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

The acute toxicity of 1-naphthol has been studied in eight species representing three trophic levels. The catfish Mystus cavasius had a 96 hour LC50 of 0.33 mg/L (95% confidence limits 0.25 -0.4 mg/L, flow-through exposure (key). The 96 hour LC50 for four additional fish species ranged from 1.1 – 4.63 mg/L (Geiger et al 1984, Holcombe et al 1984, Tilak et al 1981) (supporting). The invertebrate Daphnia magna had a 48 hour EC50 of 2.51 mg/L (Beasley 2016) and the 72 hours EC50 value for inhibition of specific growth rate in the green algae Pseudokrichneriella subcapitata was >2.18 mg a.i./L. 

The algae ErC10 and NOEC values for inhibition of specific growth were > 2.18 and 0.0173 mg a.i./L respectively (Bergfield 2016).

1-naphthol tested in a 21-day Daphnia magna study gave an EC 50 > 1 mg/L (immobilization), NOEC 0.25 mg/L (reproduction rate), LOEC 0.5 mg/L (reproduction rate) and MATC 0.38 mg/L (reproduction rate).

Additional information