Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
no data available: testing technically not feasible

Marine water

Hazard assessment conclusion:
no data available: testing technically not feasible

STP

Hazard assessment conclusion:
no data: aquatic toxicity unlikely

Sediment (freshwater)

Hazard assessment conclusion:
no data available: testing technically not feasible

Sediment (marine water)

Hazard assessment conclusion:
no data available: testing technically not feasible

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
no data available: testing technically not feasible

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Effects caused by target chemical titanium oxide sulphate were assessed based on its stable, final hydrolysis products, as they are formed quickly in contact with humidity and therefore virtually in all relevant environmental media. During hydrolysis, sulphuric acid is being formed and thus pH effects may occur. However this is not regarded as true toxicity and is excluded from assessment, which is in accordance with the endpoint related test protocols. Solely the guidance on activated sludge respiration inhibition testing (OECD TGD 209) does not exclude the observation without pH adjustment. Thus read across to sulphuric acid and to the other transformation product, titanium dioxide was made in order to assess the potential effects to activated sludge caused by pH. As pH effects are more than three orders of magnitude higher than the one of the other transformation product it was concluded that acidity dominates rather than modifies the combined effect. Accordingly the assessment is being based on read across from titanium dioxide.

The titanium dioxide formed during hydrolysis is insoluble in water (< 1 µg/L). In order to assess effects of the formed microdisperse particles, the experiments with this test item used generally Water Accommodated Fractions (WAFs) together with the insoluble material in excess. In such experiments no relevant ecotoxic effects were being observed.

 

Conclusion on classification

Even though testing of target chemical titanium oxide sulphate itself is technically not feasible due to its hydrolytic instability, the hazard assessment could be accomplished on the basis of read across from the transformation products. The relevant transformation product for the effects on algae, daphnids or crustacea, and fish is titanium dioxide in the rutil modification. As evidenced experimentally by studies conform to guidelines, titanium dioxide is not acute toxic or chronic toxic to algae, daphnids and fish in so far as no 50% effect level is reached up to the water solubility level, which was determined according to OECD Environmental Health and Safety Publications Series on testing and assessment no. 29 (Guidance document on transformation/dissolution of metals and metal compounds in aqueous media). Brouwers (2009) found the solubility below the level of detection of the analytical method, i.e. < 1 µg/L at pH 6, 7, and 8. Bioaccumulation of titanium species was likewise not observed. Therefore no classification of target substance titanium oxide sulphate as to its ecotoxicity properties applies.

Brouwers T (2009). 24h screening transformation/dissolution test of Chloride reactor discharge at a 100 mg/L loading in a standard aqueous medium at pH 6, 7 and 8. testing laboratory: ECTX consult bvba, Bergstraat 73, B3500 Hasselt/ analytical phase: Servaco nv, Tramstraat 2, B8560 Wevelgem.