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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

The acute toxicity of a,a,a-trifluoro-3-tolyl isocyanate was characterized by an EC50 of 4.2 mg/L by using a solvent. The hydrolysis product a,a,a-trifluoro-3-trifluoro-m-toluidine shows an EC50 of ca. 35 mg/L.

Key value for chemical safety assessment

LC50 for freshwater fish:
35 mg/L

Additional information

Isocyanates are known to rapidly hydrolyse under the formation of the corresponding amine as well as solid polyurea compounds *. However, the insoluble inert polyurea is not assumed to cause environmental hazards due to the reduced uptake of high molecular mass compounds, whereas the amine is assumed to be the ecotoxicological relevant species. Concluding, tests performed using the corresponding amine can equally be used to assess the ecotoxicological hazards of isocyanates assuming the complete transfer of the isocyanate into the corresponding amine while neglecting the formation of a certain fraction ecotoxicological not active polyurea compounds. An underestimation of environmental hazards is thus avoided supporting a conservative and thus protective hazard assessment.

* Bayer Industry Services (2004). 4-chlorophenyl-isocyanate: Investigation on Stability in Aqueous Test Solutions. Project No: 200300181. Leverkusen, Germany.

Bayer Industry Services (2003). Isopropylisocyante: Investigation on Stability in Aqueous Test Solutions. Project No: 200300095. Leverkusen, Germany.