Registration Dossier
Registration Dossier
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EC number: 237-430-5 | CAS number: 13780-39-7
Endpoint summary
Administrative data
Description of key information
Additional information
Neither target compound titanium oxychloride nor parent compound titanium tetrachloride will reach sediment compartments as they are being transformed in water immediately via hydrolysis to non-poisonous titanium dioxide (CAS 13463-67-7) and hydrogen chloride (CAS 7647-01-0). Effects may occur due to pH drop caused by the dissociation of hydrogen chloride, however these effects are not considered as substance specific. Accordingly the risk assessment can be based on the assessment of the other final hydrolysis product titanium dioxide by using the Equilibrium Partitioning Method (EPM) and no testing is required.
The final hydrolysis product, titanium dioxide (CAS 13463-67-7), is released isomolar to parent compound titanium tetrachloride and target compound titanium oxychloride. Exposure of the terrestrial compartments via air is unlikely due to its fugacity properties but may occur via dust. Even in the unlikely case that relevant amounts of titanium tetrachloride / titanium oxychloride would enter soils, the pore water contact would immediately induce the hydrolysis reaction. Titanium dioxide is considered inert and non-poisonous in the relevant isomolar levels. This is in accordance with read across from experimental data on titanium dioxide effects to terrestrial plants, micro-organisms, earthworms, and arthropods (ARCADIS 2008, Jemec et al 2008, Heckman et al 2008, and Velzeboer et al 2008). Heckman et al 2008 report some effect of 1000 mg/kg nanoscaled material to earthworm reproduction, which lack at the bulk material.
The risk can be assessed on the basis of isomolar titanium dioxide effects according to the Equilibrium Partitioning Method (EPM). As no aquatic toxicity is known and no threshold levels exist, the EPM predicts no toxicity to soil organisms.
In conclusion it is assessed that neither target compound titanium oxychloride nor parent compound titanium tetrachloride
and their hydrolysis products exhibit acute or chronic toxicity to terrestrial organisms. As no effect level was reached no threshold concentration was derived and no starting point for the calculation of soil PNECs is given.As neither the parent compound titanium tetrachloride, nor the target compound titanium oxychloride nor the final hydrolysis transformation products (namely titanium dioxide) pose a risk to terrestrial life, no further testing is required.
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