C.I. Pigment Brown 24 CAS NÂ°: 68186-90-3

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OECD SIDS C.I. PIGMENT BROWN 24 measured by atomic absorption to be 10,000 mg/l; Daphnia magna: EC 50 (48 h) > 100 mg/l; Desmodesmus subspicatus: EC 50 (72 h)> 100 mg/l; Pseudomonas putida: EC 50 (30 min) > 10,000 mg/l. The substance is not acutely toxic to aquatic organisms (fish, invertebrates and algae) in tests with either aqueous eluates or suspensions prepared with nominal concentrations far exceeding its water solubility. No data are available on terrestrial organisms. The substance is inorganic and thus not biologically degradable. According to the low water solubility and the structural properties of the pigment, bioaccumulation is not expected. Exposure Pigment brown is used for coloring plastics, ceramics, building materials and coatings. The estimated world production amounts to 10,000 – 15,000 tonnes. No data are available concerning exposure. Pigments released from production sites and not having been eliminated mechanically, will probably absorb to sewage sludge. In the end products, the pigments are fixed in the matrix and a release into the environment during use phase is not expected. RECOMMENDATION The chemical is currently of low priority for further work. RATIONALE FOR THE RECOMMENDATION AND NATURE OF FURTHER WORK RECOMMENDED The chemical is currently of low priority for further work based on a low hazard potential. 4 UNEP PUBLICATIONS
OECD SIDS C.I. PIGMENT BROWN 24 SIDS Initial Assessment Report 1 IDENTITY 1.1 Identification of the Substance CAS Number: 68186-90-3 Chemical Name: C.I. Pigment Brown 24 Empirical Formula: (Ti, Cr, Sb) O 2 Structure Complex inorganic coloured pigment based on titanium dioxide; in the rutile lattice titanium ions are partially replaced by 2 to 6 % chromium (III) and 8.5 to 14 % antimony (V) ions According to the intended use, medium particle size varies between 0.5 and 1.5 m. Synonyms: Chrome Antimony Titanate Chrome antimony titaniumoxide rutil Chrome rutile yellow C. I. 77310 Titanium, Antimony, Chromium III oxide rutile 1.2 Purity/Impurities/Additives Substance type: inorganic Physical status: solid Purity: > 99% w/w (acid-soluble impurities amount to 10 –20 mg/kg antimony and 10-20 mg/kg chromium(III). These impurities are not fixed in the lattice and are extractable with HCl. After 2 extractions with HCl, the acid soluble impurities are reduced to amounts below the detection limit (
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C.I. Pigment Brown 24 CAS NÂ°: 68186-90-3

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