Enhanced Oxidative Stress and Physiological Damage in Daphnia magna by Copper in the Presence of Nano-TiO₂

Figure 4

Relationships between (a) SOD activity and accumulated copper, (b) mortality and SOD activity, (c) CAT activity and accumulated copper, and (d) mortality and CAT activity in D. magna after 3 d of exposure to Cu²⁺ at different concentrations in the absence and presence of 2 mg L⁻¹ nano-TiO₂. Mean ± standard deviation (𝑛=2).

(a)

(b)

(c)

(d)