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Sediment toxicity

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Description of key information

The risk is assessed on the basis of the EPM, which indicates no toxicity.

Key value for chemical safety assessment

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.

Due to the absence of aquatic toxicity threshold levels no such level can be derived for the sediment. This is supported by the absence of effects to the marine mud shrimps exposed to more than 35 g TiO2/kg sediment dw (Hudson 2007).

In conclusion it is assessd that neither target compound titanium oxychloride nor parent compound titanium tetrachloride

and their hydrolysis products exhibit acute or chronic toxicity to sediment organisms. As no effect level was reached no threshold concentration was derived and no starting point for the calculation of sediment PNECs is given.

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