Registration Dossier
Registration Dossier
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EC number: 403-080-9 | CAS number: 92484-48-5 BENZTRIAZOL UV ABSORBER BUK 4499; BUK 4499; UV ABSORBER BUK 4499
Endpoint summary
Administrative data
Description of key information
The substance is acutely harmful to aquatic organisms.
Additional information
Short-term toxicity tests are available for all three trophic levels: Acute toxicity to Sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate was tested in an acute toxicity test with zebra fish (Brachidanio rerio) under semi-static conditions. The LC50 after 96 h is determined to be 420 mg/L. Sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate was tested for its acute toxicity to Daphnia magna. 100 mg/L were tested in a limit test. The nominal concentration was analytically verified. No mortality was observed in control and control throughout the test. Thus, the 48h-EC50 value is determined to be > 100 mg/L based on nominal concentrations. Sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate was assessed for its toxicity towards algae. The EC50(72 h) based on growth rate was determined to be 34 mg/L (95% confidence limit 30.7 - 37.9). The NOEC (growth rate, 72h) was 4.3 mg/L. Based on these data the test substance is considered to be harmful to aquatic organisms.
Toxicity of sodium 3(2H-benzotriazol-2-yl)-5-sec-butyl-4-hydroxybenzenesulfonate on microorganism was investigated by determining the effects on respiration rate for a period of 30 minutes in an activated sludge respiration inhibition test according to OECD guideline 209. The IC50 (3 h) of test item was > 100 mg/L. Thus, inhibitory effects of the test substance on microorganisms in STPs are not anticipated.
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