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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The acute toxic effects of 1,2,3 TCP to algae are characterized by a EC50 of 49.6 mg/L and a NOEC of 12.8.

Key value for chemical safety assessment

EC50 for freshwater algae:
101 mg/L
EC10 or NOEC for freshwater algae:
12.8 mg/L

Additional information

Data exist from three algal species (Chlorella vulgaris, Chlamydomonas angulosa, Pseudokirchnerella subcapitata). Hutchinson et al (1980) tested the former two species in 3 h exposure experiment were inhibition of metabolic rate was measured as reduction of carbon dioxide uptake. The determined EC50 values of 170 and 112 mg/L respectively were not regarded for assessment as the method is considered not acceptable.

Reliable figures are available form de Groot (2002) on green alga (Pseudokirchnerella subcapitata). The study is valid and conclusive and a 72-h ErC50 value of 101 mg/L (i.e. related to the endpoint growth rate), which is the relevant value with regard to GHS/CLP, was obtained. This study (de Groot 2002) finds an acute 72-h NOEC of 12.8 mg/L.