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Ecotoxicological information

Toxicity to microorganisms

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Description of key information

EC50 (3h) > 280 mg/L

Key value for chemical safety assessment

Additional information

No experimental data investigating the chronic effects of sodium 2,4-dichlorophenoxyacetate (CAS No. 2702-72-9) to microorganisms were available. This substance is highly soluble and it is rapidly dissociated in water, being 2,4-dichlorophenoxyacetic acid (CAS No. 94-75-7) its main product. Therefore, a conclusion on this endpoint was drawn based on the microorganisms toxicity data of 2,4-dichlorophenoxyacetic acid. This substance was tested in a study by Swoboda (2006) according to OECD Guideline No. 209, Activated Sludge Respiration Inhibition Test (1984), under GLP conditions. The results showed no significant inhibitory effects of the test material on microorganisms respiration and therefore, an EC50 greater than 280 mg/L was determined.