![]() High E values represent an oxidizing environment. Low E (or pE) values represent a reducing environment. Simplified Pourbaix diagram for 1 M iron solutions. This type of predominance diagram is known as a Pourbaix diagram.E o-pH diagram, or pE-pH diagram. In order to add this variable, we must expand the predominance diagram to include the reduction potential of the environment as well as the pH. You must also take into consideration whether the aqueous environment is well aerated (oxidizing) or polluted with organic wastes (reducing). Knowledge of the pH condition of the environment is not sufficient for predicting the form in which an element will exist in natural waters. However, if suitable reducing agents are present, the phosphorous may not remain in the +5 oxidation state. The effects of pH on the form in which an element in a given oxidation state exists in natural waters can be summarized with predominance diagrams such as that for phosphorous (V) shown below.
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