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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

Acutely harmful to aquatic algae

Key value for chemical safety assessment

Additional information

The growth inhibition induced in Scenedesmus subspicatus by an exposure to the substance was tested in a study conducted according to German standard DIN 38412, part 9. At termination of the study an EC50 of 74.4 mg/l based on the algal growth rate was determined (BASF AG, 1988).

Further information is available for two salts of naphthalenesulphonic acid, 1 -NSDA sodium salt and 2 -NSA, ammonium salt, both studies revealed EC50 values above 100 mg/l..