Figure 1

Effect of TiO ₂ applied as dry powder to soil and food. All tests (plant growth; earthworm reproduction, nitrogen transformation) were carried out according to the relevant OECD test guidelines in natural soil. The bars indicate the percent effect compared to the control at the different test concentrations. Stimulation is shown by negative values, inhibition by positive values. After the test description, the range of the test concentrations is shown in parentheses. Similar concentrations in different tests are shown in the same color (e.g. 9 and 10 mg/kg; 44 and 50 mg/kg).