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Ecotoxicological information

Endpoint summary

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The acute toxicity of TCD to rainbow trout (Oncorhynchus mykiss) has been assessed under semi-static conditions using a sealed test system.

Based on mean measured concentrations, the 96 hour LC50 was 0.116 mg/L (95% confidence limits of 0.0913 and 0.140 mg/L), and the no observed effect concentration was 0.0417 mg/L.

The acute toxicity of TCD to Daphnia magna was assessed, in semi-static exposure conditions and in a sealed test system, over 48 hours, with renewal of media at 24 hours. The 48-hour EC50 of TCD for the immobilisation of Daphnia magna was 0.158 mg/L (95% confidence limits of 0.129 and 0.17 mg/L) based on measured concentrations of TCD. The 48 hour ‘no-observed effect concentration’ NOEC of TCD with Daphnia magna was 0.0553 mg/L (measured concentration) TCD.

The effect of TCD on the growth of the unicellular green alga Pseudokirchneriella subcapitata has been assessed over a 72 hour period.

After 72 hours of exposure to TCD, the ErC50 (growth rate) and EyC50 (yield) were 0.590 and 0.210 mg/L respectively, based on measured and estimated concentrations. The “no observed effect concentration” (NOEC) for growth rate and yield was 0.0867 mg/L based on estimated concentrations, and the “low observed effect concentration” (LOEC) for growth rate and yield was 0.288 mg/L based on measured concentrations.

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