Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

Additional information

The acute aquatic toxicity ofthis substance was evaluated using rainbow trout and was conducted in accordance withOECD 203. The 96 h LL (Lethal Loading Rate) 50 value of the substance was determined to be 4.4 mg/l. The No Observed Effect Loading rate was 3.2 mg/l loading rate WAF.

Then acute toxicity of this substance also was evaluated inDaphnia (OECD 202). The 48-Hour EL*50 was determined to be 75 mg/L nominal loading rate and the No Observed Effect Loading rate was 32 mg/l nominal loading rate.

The acute toxicity of this substance was evaluated in freshwater algae in accordance with OECD Guideline 201. Exposure ofScenedesmus subspicatusto the test material gave an EbL50 (72h) value of 240 mg/L loading rate WAF and an ErL50 (0-72hr) value of 410 mg/L loading rate WAF. The No Observed Effect Loading rate was 220 mg/L loading rate WAF.

Long term ecotoxicological data are available on a surrogate ZDDP substance for invertebrates and this ZDDP substance for algae. A 21 day reproduction test in Daphnia magna was conducted following OECD Guideline 211. Results from this study show that the NOEC for reproduction was 0.4 mg/L nominal (0.262 measured), and the NOEC for daphnid length and weight was 0.8 mg/L nominal.