In the deeper parts of peat, the pe-value is buffered by the sulfur system, meanwhile the iron and mangan system buffers in the more superficial and oxidating peat layers
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a) Calculate pe and the oxygen pressure (PO2) in depth when the pH-value is 6.5 an if pe buffers by the following redox pair: SO42- / HS-(aq) where [SO42-] = 0.0002 M and PH2S(g) = 10-4 atm
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b) At another spot with pH = 6.0 the oxygen pressure was 10-15 atm. Calculate the Mn2+ content if the redox pair MnO2(s) / MN2+ buffers pe.