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Short-term toxicity to aquatic invertebrates

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Description of key information

Sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate was tested for its acute toxicity to Daphnia magna according to the Guideline 202, Part I of the OECD and to the Directive 84/449 EEC. The EC 50 value was estimated to be 848.5 mg/l (Logit model) for the respective exposure period.

Key value for chemical safety assessment

Fresh water invertebrates

Fresh water invertebrates
Effect concentration:
848.5 mg/L

Additional information

Sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate was tested for its acute toxicity to Daphnia magna according to the Guideline 202, Part I of the OECD and to the Directive 84/449 EEC. Groups of ten daphnias were exposed to sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate at the nominal concentration of 0, 62.5, 125, 250, 500 and 1000 mg/L. All tests were run in duplicate.

The EC 0 after 24 hours was determined to be 62.5 mg/l. The EC 100 value was found to be >1000 mg/l for 24 hours of exposure.

The EC 50 value was estimated to be 848.5 mg/l (Logit model) for the respective exposure period. The 95 %-confidence limits for the EC 50 value of the respective exposure period were: 560.8 - 2179 mg/l.

In conclusion, the test item showed very low toxicity to daphnias.

The mortality observed with the control animals was 0 % after 24 hours.

The tests were validated by testing potassium dichromate. The EC 50 value determined for potassium dichromate after 24 hours was 2.08 mg/l.