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EC number: 215-035-9 | CAS number: 1271-19-8
Three acute aquatic endpoint for three trophic levels are available.
The acute fish endpoint is fulfilled using Weight of Evidence. An OECD 236 (FET) study of substance CAS 1271 -19 -8 gave an LC 50 of > 100 mg/L. It was demonstrated that CAS 1271 -19 -8 rapidly hydrolyzes (see 5.1.2).
No endpoints can be estimated with ECOSAR for metal substances, therefore only estimates are given for the organic parts of the chemical structure; Dicyclopentadiene (CAS 77 -73 -6) and Cyclopentadiene (CAS 542 -92 -7). 96h-LC50 are estimated to be 9.765 mg/L and 32.082 mg/L, respectively.
A study according to OECD Guideline 202 was performed to assess the acute toxicity of the test item to Daphnia magna under semi-static concentions.
The 48h-EC50 for Daphnia magna is 2.4 mg/L (geomean measured test concentration).
A study according to OECD Guideline 201 was performed to assess the toxicity of the test item to freshwater algae.
Geometric mean measured concentrations were determined. The 72h-ErC50 is 0.76 mg/L (geomean measured test concentration).
The estimated water solubility limit for the parent substance CAS 1271 -19 -8 is 2.6 mg/L. The FET result is in line with ECOSAR results for the hydrolysis byproducts.
In an OECD 209 study performed under GLP the EC50of dichlorobis (ɳ-cylcopentadienyl)titanium for 3 hours contact time was found to be 712 mg/L. The EC10and EC80values could not be determined and the EC20values was 23 mg/L. Dichlorobis(ɳ-cylcopentadienyl) is therefore considered not harmful to activated sludge.
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