Conceptually Simple - Easy to Use - Easy to Analyze
Conceptually Simple - Easy to Use - Easy to Analyze
IRIS – is an acronym for Indicator of Reduction In Soils. “Reduction” means electrochemical reduction caused by the activity of soil microbes under wetland conditions. Reducing conditions contribute to important wetland ecosystem functions.
IRIS are PVC devices (films or tubes) coated with Fe (or Mn) oxides that can be installed into a saturated soil to measure or document reduction.
In wetland soils, microbes consume dissolved oxygen as an “electron acceptor” while decomposing organic matter. When soils are saturated, this can result in the soil becoming anaerobic (reducing).
When dissolved oxygen is depleted in soils (when soils are anaerobic/reduced), microbes will used other compounds for “electron acceptors” such as Fe oxides or Mn oxides.
When IRIS are installed in the soil, microbes can utilize the oxide coatings on IRIS (as electron acceptors), and as they do, the coatings are altered, and become dissolved, and strip off the IRIS device.
Therefore, the stripping or removal of (Fe or Mn) oxide coatings from IRIS, demonstrates that the soil has become anaerobic or reducing, and is functioning like a true wetland soil.
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