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A method for controlling redox potential in packed soil cores

, : A method for controlling redox potential in packed soil cores. Soil Science Society of America Journal 45(1): 35-38

A system was devised to maintain packed soil cores under a wide range of redox potential conditions and to measure the effect of redox potential on reduction of oxidized Fe and Mn compounds. The redox control system depended on adjusting the moisture tension or suction in the soil by use of an automatic redox sensing and a moisture tension control system. A coarse-textured soil with rapid water film movement was necessary for good redox potential control. Adjusting the redox potential to various values ranging from aerobic to anaerobic caused Fe reduction and Mn reduction patterns similar to those obtained in earlier experiments using stirred suspensions. Oxidized Mn compounds began to be reduced to the Mn2+ form at approximately +400 mV. Fe began to be reduced to the Fe2+ form at approximately +200 mV.


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