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Short-term toxicity to aquatic invertebrates

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Description of key information

The results of a number of published and proprietary studies are available.

Key value for chemical safety assessment

EC50/LC50 for freshwater invertebrates:
900 mg/L

Additional information

Bringmann & Kuehn (1982) describe an improved standardised procedure for the assessment of the toxic effects of chemicals on Daphnia magna. The 24 -hour EC0, EC50 and EC100 values for Daphnia magna (immobilisation) were calculated to be 603 mg/L, 900 (841 -1061) mg/L and 1250 mg/L respectively, under the conditions of this study.

Ewell et al (1986) describe the development of a test system designed to simultaneously assess the aquatic toxicity of chemicals to seven species, including six invertebrate species. Under the conditions of this study, the 96 -hour LC50 of triethyl phosphate in the invertebrate species tested [Asellus intermedius (pillbug), Daphnia magna (water flea), Dugesia tigrina (flatworm), Gammarus fasciatus (sideswimmer), Helisoma trivolvis (snail) and Lumbriculus variegatus (segmented worm)] were all reported to b >100 mg/L.

Knie et al (1983) report the results of a series of aquatic toxicity tests with various chemicals. EC0, EC50 and EC 100 values for triethyl phosphate in Daphnia magna of 500, 950 and 1500 mg/L respectively are reported.

The acute toxicity of triethyphosphate was assesed in Daphnia magna Straus in a range-finding study for the reproductive toxicity study. The 24 -hour EC0, EC50 and EC100 values for triethyphosphate in Daphnia magna were found to be 1000 mg/L, 2705 mg/L and 5000 mg/L respectively, under the conditions of this test (Bayer, 1987).