Assessing the long-term effects of the selected nanomaterial titanium dioxide – adaptation of testing procedures

Effects of the nanomaterial titanium dioxide NM-105 were studied in a sediment/water system with Lumbriculus variegatus according to OECD test guideline 225. Test media were prepared by mixing NM105 suspensions and the sediment-overlying water. Nominal test concentrations were confirmed by chemical analysis of Ti concentrations in the test media. Effects of titanium dioxide (NM-105) were also investigated in OECD test guideline 226 tests with the predatory mite Hypoaspis aculeifer; test substrates were prepared by mixing NM105 powder into artificial soil (test concentrations ≥ 10 mg/kg) or applying NM-105 suspensions to the soil (test concentrations ≤ 10 mg/kg).

The final report of this project is available [read more].