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.
Toxicity to soil microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
No study is available to assess the toxicity of slags, silicomanganese-manufg to terrestrial micro-organisms since direct and indirect exposure of the soil compartment is unlikely.
Key value for chemical safety assessment
Additional information
In accordance with column 2, section 9.4, of REACH Annex IX , the testing on microbes study (required in section 9.4.2.) does not need to be conducted since direct and indirect exposure of the soil compartment is unlikely. This understanding is confirmed in the TDp test (IUCLID section 5.6). Here, one of the components (manganese) within the crystalline matrix is only seen at a concentration of 1 µg/L (after 28 days from 1 mg/L loading). Since the registered substance is a by-product of several metallic oxides in a crystalline matrix, any ionic metal leaching out of this matrix (considered very unlikely) is predicted to bind strongly to soil and sediments. On this basis the bioavailable concentration of any element from SiMn Slag to terrestrial organisms is predicted to be much less than the background concentration of manganese in European soils (428.6 mg Mn/kg).
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