Registration Dossier
Registration Dossier
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EC number: 273-733-9 | CAS number: 69012-33-5 By-product of the manufacture of silicomanganese alloy containing oxides of aluminum, calcium, magnesium, manganese and silicon.
Endpoint summary
Administrative data
Description of key information
Additional information
ENVIRONMENTAL FATE PROPERTIES
Summary of degradation
In accordance with REACH Annex XI section 2, biodegradability testing is not required as the substance is inorganic and hence biotic degradation cannot occur. Testing for these endpoints has been omitted on the basis that testing is not technically feasible.
Volatilisation
Data on volatilisation are not available for the substance. SiMnslag itself is a solid, glass-like substance and hence it is not volatile.
Distribution modelling
No distribution modelling data exist.
Summary of environmental distribution
An adsorption / desorption screening study test is technically not possible due to the physical nature of the substance (an inorganic solid). Furthermore, a transformation dissolution study has shown that the concentration of manganese released from the substance (1 µg/L after 28 days from 1mg/L loading) is less than the background concentration of manganese in European soils (428.6 mg/kg).
Summary and discussion of bioaccumulation
No experimental data on bioaccumulation exist. The data are not required as the hazard and risk assessment performed during the chemical safety assessment concludes that the substance is not classified and is of no immediate concern to the environment. The available data are adequate for classification and labelling purposes.
Secondary poisoning
Bioaccumulation of the substance is not expected to occur. Hence no secondary poisoning risk exists.
ENVIRONMENTAL
HAZARD ASSESSMENT
Aquatic, sediment and soil toxicity
A transformation dissolution study has shown that the concentration of manganese released from the substance (1 µg/L after 28 days from 1 mg/L loading) is less than the background concentration of manganese in European environments (15.9 µg Mn/L in surface water, 452 mg/kg in sediment, 428.6 mg/kg in soil). Therefore aquatic toxicity data for the SiMn slag were not considered to be required due to insignificant exposure.
By the same reasoning, PNEC values were also considered not to be required.
Assessment of PBT/vPvB Properties - Comparison with the Criteria of Annex XIII
According to the Guidance on information requirements and chemical safety assessment, Chapter R.11: PBT assessment, “the PBT and vPvB criteria of Annex XIII to the regulation do not apply to inorganic substances”. Therefore SiMn slag is not considered to require any further assessment of PBT properties.
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