Sulfate reduction

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During the decomposition of organic matter by anaerobic sulfate reducing prokaryotes, sulfate ions, which act as the terminal electron acceptors, become reduced. Hydrogen sulfide is produced and discharged into the environment. Any metal ions present are precipitated as the metal sulfide. This sulfate reduction process is summarised below:

SO42- + 2CH2O → H2S + 2HCO32-

M2+ + S2- → MS

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