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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

Invertebrates represent the most susceptible organism group in the aquatic environment. Although marine species data exist the dose descriptors for both freshwater and marine water are assigned to the lowest value obtained from freshwater, due to reliability considerations .

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
4.1 mg/L
EC50/LC50 for marine water invertebrates:
4.1 mg/L

Additional information

For those invertebrates tested, the lowest 48-h EC50 value of 4.1 mg/L with the endpoint immobilization, which was about 5 times lower than the corresponding value from daphnids, was reported by Rose et al (1998) for a cladoceran (Ceriodaphnia cf. dubia). The EC 50 for daphnids (Daphnia magna) was found to be 20 mg/L (de Groot 2002). Both studies followed a guideline protocol and are considered valid and conclusive.

For marine species a value is available from Kooijman (1981). The test organism employed was (Chaetogammarus marinus) and the measured endpoint was LC50 after 48 h of 45 mg/L. Since the latter is not reliable because of lacking analytical dose verification and supposed vaporisation of TCP during the exposition, the freshwater value should be used in assessment for the marine compartment as well.