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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

Four GLP-studies according to OECD guideline 202 are available for different grades of the reaction mass of divinylbenzene and ethylstyrene.
The grade with the higest toxicity to daphnia magna was DVB-HP. Two studies were conducted with this grades and the 48 hour EC50s from these studies were 0.69 mg/L and 1.87 mg/L. The geometric mean of these two data points was 1.14 mg/L. This was the lowest toxicity value for aquatic invertebrates.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
1.14 mg/L

Additional information

Four high quality acute toxicity tests (Klimisch rating 1) with different grades of the reaction mass of divinylbenzene and ethylstyrene were performed with Daphnia magna. One test was performed with DVB-55 (approximately 55% divinylbenzene and 45% ethylstyrene) resulting in a 48 -hour EC50 of 2.72 mg/L. Another acute toxicity test with daphnids was performed with DVB-63 (approximately 63% divinylbenzene and 37% ethystyrene) resulting in a 48 -hour EC50 of 1.31 mg/L. Two acute toxicity tests with Daphnia magna were performed with DVB-HP (approximately 80% divinylbenzene and 20% ethylstyrene) with reported 48 -hour EC50 values of 0.69 mg/L and 1.87 mg/L. Since the EC50 results for DVB-HP were within an order of magnitude, and were based on the same endpoint and species, a geometric mean of 1.14 mg/L was calculated from these two data points. The EC50 of 1.14 mg/L was selected as the key parameter for acute toxicity to aquatic invertebrates since it was the lowest acute toxicity value for this endpoint.

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