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Eh-pH predominance diagram for aqueous chromium at 25 °C ( Cr tot = 1 µM).

pH It is defined as the negative common logarithm of the concentration of hydrogen ions [H + ] in moles/liter: pH = -log 10 [H + ]. The concentration of hydrogen ions is commonly expressed in terms of the pH scale. Low pH corresponds to high hydrogen ion concentration and vice versa.

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Eh-pH predominance diagram for aqueous chromium at 25 °C ( Cr tot = 1 µM).

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  1. pH It is defined as the negative common logarithm of the concentration of hydrogen ions [H+] in moles/liter: pH = -log10 [H+]. The concentration of hydrogen ions is commonly expressed in terms of the pH scale. Low pH corresponds to high hydrogen ion concentration and vice versa.

  2. a Pourbaix diagram, also known as a potential/pH diagram or Eh/pH diagram. The diagrams are named after Marcel Pourbaix (1904–1998), the Russian-born chemist who invented them. In sedimentary environments the concept of geochemical facies is best illustrated on an Eh-pH diagram, a diagram delineating the stability field of certain minerals in terms of the proton concentration (pH) and electron concentration (Eh). Eh and REDOX: the ability of an environment to supply electrons to an oxidizing agent, or to take up electrons from a reducing agent.

  3. Eh-pH predominance diagram for aqueous chromium at 25 °C (Crtot = 1 µM).

  4. Specific conductance (SpC) is a measure of the concentration of soluble salts in solution. Conductance is also a readily available field test which enables a worker to compare a new sample with previously analyzed samples quickly and easily. Irrigation Recommendations

  5. Alkalinity (AT) is a measure of the ability of a solution to neutralize acids to the equivalence point of carbonate or bicarbonate.

  6. Typical ranges of values for some water field measurements. From: Sanders, L.L., 1998, A Manual of Field Hydrogeology: Prentice-Hall, NJ, 381p.

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