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. 2016 Dec 1;611:3–19. doi: 10.1016/j.abb.2016.04.010

Fig. 1.

Fig. 1

Pourbaix diagram for the speciation of zinc. Red and green dashed lines demonstrate two possible cathodic reactions, oxygen reduction (oxygen dissolved in water in equilibrium with water) and hydrogen ion reduction (water in equilibrium with gaseous hydrogen), respectively. The orange arrow shows the range of biological standard reduction potentials at pH 7.0: from ∼820 mV to ∼ −670 mV.