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Toxicity to aquatic algae and cyanobacteria

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Description of key information

Diuron is toxic to aquatic algae

Key value for chemical safety assessment

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Three toxicity tests with aquatic algae and cyanobacteria, all according to OECD guidelines (OECD 201 and 221) and GLP, are available for Diuron. A key study using the green alga, Scenedesmus subspicatus, calculated an (72 h) EC50 (growth) of 22 µg/L with a NOEC value of 3.2 µg/L (Heimbach, 1991). Since this is a standard species for acute toxicity testing in algae then these values are used as evidence of Diuron causing acute toxicity to aquatic plant species. Two supporting studies also determined EC50 and NOEC values of similar concentrations. The (72 h) EC50 ( growth) and NOEC values for Anabaena flos-aquae (cyanophyta) were 30.9 µg/L and 10 µg/L respectively (Memmert, 1998).