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• Sulfate (SO,'-) <br /> After dissolved oxygen and nitrate have been depleted in the microbiological treatment zone, <br />' sulfate may be used as an electron acceptor for anaerobic biodegradation. This process is <br /> sulfanogenesis and results in the production of sulfide. Sulfate concentrations are used as an <br /> indicator of anaerobic degradation of fuel compounds. <br /> Ferrous Iron (W) <br /> In some cases ferric iron (Fe''') is used as an electron acceptor during anaerobic biodegradation of <br /> Petroleum hydrocarbons. In this process, ferric iron is reduced to the ferrous form which may be <br /> soluble in water. Ferrous Iron concentrations are used as an indicator of anaerobic degradation of <br /> petroleum hydrocarbons <br /> Oxidation-reduction potential (Eh) and pH have a significant influence on iron solubility. <br /> Depending on Eh/pH conditions,iron may dissolve or precipitate. <br /> 1 <br />' r <br /> I <br /> I <br /> r. <br />■ 7 i <br /> I <br />