Registration Dossier
Registration Dossier
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EC number: 209-942-9 | CAS number: 598-62-9
Endpoint summary
Administrative data
Description of key information
Additional information
A standard acute toxicity study with Daphnia was conducted as a limit test at 100% v/v saturated solution (equivalent to 3.6 mg/L) and showed no effects. Therefore the 48 hour EC50 was greater than 3.6 mg/L, and the NOEC was 3.6 mg/L. These results were very similar to those obtained with MnO (48 hour EC50 was greater than 3.2 mg/L, and the NOEC was 3.2 mg/L).
Furthermore, two standard studies on algae were conducted, one with the registered substance, MnCO3, and one with MnO. The study with MnO resulted in a 72 hour ErC50 > 1.3 mg/L, EyC50 = 1.1 mg/L, NOEC = 0.41 mg/L whilst the study with MnCO3resulted in a 72 hour ErC50 > 2.2 mg/L, EyC50 > 2.2 mg /L, NOEC = 0.69 mg/L.
Given that the transformation/dissolution results are also very similar for MnCO3and MnO (9208.2 µg/L after 7 days from 100mg/L loading for MnCO3and 8803.1 µg/L after 7 days from 100mg/L loading for MnO), it is considered that further aquatic toxicity results on MnO can be justifiably used to address environmental data requirements of MnCO3where no studies on MnCO3 are available.
Data on MnO were used to address the acute toxicity test with fish, the chronic toxicity test with aquatic invertebrates, and the toxicity test with microorganisms, as follows:
A standard acute toxicity study with fish was conducted with MnO, as a limit test, at 100% v/v saturated solution and showed no effects. Therefore the 96 hour LC50 was greater than 100 %v/v and the NOEC was 100 %v/v (equivalent to 3.2 mg/L).
An 8 day chronic study, with MnO, on Daphnia gave EC50 (immobilisation) = 4.1.mg/L, EC50 (reproduction) = 2.5 mg/L and NOEC = 1.3 mg/L.
A standard toxicity test with microorganisms was conducted with MnO and gave a 3 hour EC50 > 1000 mg/L and a 3 hour NOEC of 1000 mg/L.
Where data are available on both the registered substance, and MnO, data on the registered substance itself have been used as key data. Upon reflection of all of the findings from the battery of ecotoxicology tests conducted both with MnO and with the registered substance, MnCO3, it is apparent that the results determined are suitably similar to justify use of data on to address the environmental endpoints for the registered substance where no studies with MnCO3are available.
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