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.
Toxicity to aquatic algae and cyanobacteria
Administrative data
Link to relevant study record(s)
Description of key information
No reliable toxicity data are available for the effect of synthetic rutile to algae. A read-across approach between synthetic rutile and TiO2 is used. Reliable toxicity data to algae are available for a range of TiO2 products with varying particle size (from nano-particles to bulk powders). Algae are the most sensitive species to TiO2. The lowest 72-h EC50 value for growth rate was observed for Pseudokirchneriella subcapitata in fresh water: 61 mg TiO2/L, with a corresponding EC10 of 12.7 mg TiO2/L. Tests with Skeletonema costatum in marine water result in an unbounded EC50 of >10000 and a NOEC of 5600 mg TiO2/L.
Key value for chemical safety assessment
- EC50 for freshwater algae:
- 61 mg/L
- EC50 for marine water algae:
- 10 000 mg/L
- EC10 or NOEC for freshwater algae:
- 12.7 mg/L
- EC10 or NOEC for marine water algae:
- 5 600 mg/L
Additional information
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