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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The test substance is toxic to aquatic invertebrates. However, observed adverse effects may be due to pH-shift

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
4.6 mg/L

Additional information

The most sensitive endpoint for diethylamin was derived from a test conducted according to ASTM guideline (1993) by Springborn laboratories (sponsored by Arkema) resulting in an LC50 of 4.6 mg/L.

In an OECD 202 guideline study van Leeuwen and co-workers (1985) determined an EC50 of 56 mg/L for the mobility of Daphnia magna after a 48 -hour exposure to the test substance. This result is in accordance with additional publications which also demonstrate, that diethylamine is harmful to aquatic invertebrates (ranging from 41 -100 mg/L; IRCHA ED, 1993; NITE, 1999; Trenel & Kuehn, 1982; Bringman & Kuehn, 1959). The EC50 reported by IRCHA ED, 1993, refers to a 24 -hour exposure only. In another 24 -hour exposure test Calamari et al., 1980, determined a 50% mobility inhibition at 164 mg/L.

There are also publications available through which the test substance would be classified as acutely not harmful since the reported EC50 values are above 100 mg/L. Trenel and Kuehn, 1982, observed an EC50 of 288 mg/L when using neutralised test substance solutions were used. Hence pH-effects may play an essential role in the harmful action of diethylamine.