Registration Dossier
Registration Dossier
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EC number: 269-050-0 | CAS number: 68186-88-9 This substance is identified in the Colour Index by Colour Index Constitution Number, C.I. 77503.
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
The solubility of the pigment is <0.8% (w/w) at 1 mg loading and pH 6 after 28 days. After 7 days at a higher loading of 100 mg the solubility of the pigment is <0.05% (w/w) at pH 6.
Key value for chemical safety assessment
Additional information
The water solubility of zinc iron chromite brown spinel was measured according to the method OECD test series No. 29 (Guidance document on transformation/dissolution of metals and metal compounds in aqueous media). The transformation/dissolution of the pigment resulted in the following dissolved concentrations:
Full test 7 days at 1 mg/L and pH 6: < 0.9 µg/L Cr, < 0.8 µg/L Ni, < LoD Fe and < 2.9 µg/L Zn
Full test 28 days at 1 mg/L and pH 6: <1.2 µg/L Cr, < 1.1 µg/L Ni, < 0.23 µg/L Fe and < 4.5 µg/L Zn
Full test 7 days at100 mg/L and pH 6: 0.87 ± 0.14 μg/L Cr, <LOD/LOQ Fe, 5.58 ± 0.48 μg/L Ni, 37.1 ± 3.65 μg/L Zn
Full test 7 days at 100 mg/L loading and pH 8: 0.51 ± 0.02 μg/L Cr, <LOD Fe, 1.51 ± 0.23 μg/L Ni, 0.68 μg/L Zn
As dissolved Cr, Ni, Fe and Zn concentrations were below 4.5 µg/L respectively, at a loading of 1 mg/L, referring to a total solubility of < 0.8 %, the pigment can be considered environmentally inert. At loadings of 100 mg at pH values 6 and 8 after 7 days, the highest dissolution was observed at pH 6 with a total dissolution of <45 µg/L (Cr, Ni, Fe and Zn).
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