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 macroorganisms except arthropods
Administrative data
Link to relevant study record(s)
Description of key information
No studies are available to assess the toxicity of slags, silicomanganese-manufg to soil invertebrates, as direct and indirect exposure of the soil compartment is unlikely.
Key value for chemical safety assessment
Additional information
Short-term toxicity
In accordance with section 9.4 of REACH Annex IX , the short-term testing on invertebrates study (required in section 9.4.1.) 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).
Long-term toxicity
In accordance with section 9.4 of REACH Annex X , the long-term testing on invertebrates study (required in section 9.4.4.) 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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