What reagent is best for detecting reduced iron (FeII) in soil or unsaturated zone cores?

28 September 2017 1 2K Report

We are interested in finding a reagent for testing, in situ, the presence or otherwise of reduced iron (FeII) in soil profiles or core. I have heard of Childs reagent being used for this purpose but have been unable to find key references on the method. We are only interested in a visual indicator, with no great need for exact concentrations. If anyone has experience with such a method it would be great to hear from you. Thanks in advance. Clint

Clinton Rissmann

A colleague shared the following paper with me. It outlines the use of 1 M solution of ammonium acetate containing a,a-dipyridyl indicator for use in field tests for exchangeable and water-soluble ferrous iron in soils. My colleague suggests that in his experience the strength of the reaction on core is often well correlated with denitrification rates assessed by push-pull tests in aquifer systems.

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