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Short-term toxicity to aquatic invertebrates

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Description of key information

The titanium tetrachloride hydrolysis transformation products do not exhibit acute effects at the level of their water solubility in addition with undissolved microdisperse matter in excess, even if ingested. 

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Titanium tetrachloride rapidly hydrolyses in water resulting in the formation of titanium dioxide (CAS 13463-67-7) and causing an increase in acidity. Titanium dioxide is very poorly soluble in water at neutral pH (< 0.1 µg/L); excess titanium dioxide will be present as insoluble matter. Aquatic toxicity data for the titanium dioxide in marine (Thomson 2007b) and freshwater (Warheit et al 2007 and Haley & Kurnas 1993) show the absence of short-term effects to invertebrates at nominal concentrations that are several orders of magnitude higher than the soluble concentration plus an additional load of undissolved microdisperse matter in excess. Physical effects on invertebrates might occur as a result of fouling, smothering or coating with high loadings of titanium dioxide precipitate but these are not a consequence of the toxicity of the substance. Actual ingestion was proven for daphnids (Haley & Kurnas 1993).

It is concluded that the titanium tetrachloride hydrolysis transformation products do not exhibit acute effects at the level of their water solubility in addition with undissolved microdisperse matter in excess, even if ingested.