Registration Dossier
Registration Dossier
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EC number: 308-551-1 | CAS number: 98072-94-7 Natural ilmenite ore is concentrated by selective removal of impurities, chiefly iron, to yield a product enriched in titanium dioxide. The process consists of an optional oxidative roast followed by a reductive roasting stage, an acidic leaching stage and washing and drying the product. Alternatively the process consists of selectively chlorinating the iron oxide present in the reduced ore.
Water solubility
Administrative data
Link to relevant study record(s)
Description of key information
Water solubility of Synthetic Rutile (experimental results, according to OECD guidance document No. 29): insoluble in water (<0.1 mg/L).
Key value for chemical safety assessment
Additional information
For the evaluation of this endpoint data from dissolution tests conducted according to the Guidance document on transformation/dissolution of metals and metal compounds in Aqueous media, OECD Series on Testing and Assessment, No.29.
Three different batches of Synthetic Rutile were tested in a 24-hour screening test and in a 7-day full dissolution test. In the screening test, the test item was introduced into aqueous medium at a single loading of 100 mg/L and pH 6, 7, and 8. Concentrations of metal ions were measured after a 24 hours period. In the main test, the transformation/dissolution determination was based on the dissolved Ti concentrations obtained after a 7days. Therefore Synthetic Rutile was introduced in aqueous medium at pH 6 at a loading of 1, 10 or 100 mg/L (“low”, “medium” or "high" loading, respectively).
Results obtained by measurements with
ICP-OES and ICP-MS revealed that all three batches of the test items
were not soluble in water. The concentration of Ti-ions were under the
detection limit.
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