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Long-term toxicity to aquatic invertebrates

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Description of key information

The hydrolysis transformation products of titanium tetrachloride do not exhibit chronic effects.

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Additional information

Titanium tetrachloride rapidly hydrolyses in water resulting in the formation of titanium dioxide (CAS 13463-67-7). The release of hydrogen chloride (CAS 7647-01-0) acid is assumed not causing an increase in acidity in the dose levels relevant for chronic exposure scenarios. Anyhow acidity is not true toxicity and not relevant for the derivation of environmental threshold levels. Thus the hazard assessment bases on titanium dioxide effects.

The assumption of absent chronic invertebrate toxicity of titanium dioxide is supported by the low bioaccumulation tendency (Frederici et al 2007), the absence of acute toxicity at high loading rates, and by the experimental data of Beim et al (1982). The experiment is not sufficiently documented but it evidences the absence of chronic effect to reproduction of daphnids up to 100 mg/L loading rate. This is five orders of magnitude higher than the water solubility of the test item titanium dioxide (< 1 µg/L).

This gives a sufficient base for assessing the chronic effects of titanium tetrachloride to daphnids. It is concluded that the titanium tetrachloride hydrolysis transformation products do not exhibit chronic effects at the level of their water solubility in addition with undissolved microdisperse matter in excess. The absence of any chronic effects (secondary or toxic) is evidenced on the basis of experimental observations at loadings up to 11.9 mg/L or higher.