The aim of this standard is to describe a test for the determination of redox potential (U), expressed in mV, using an electrode in a 1:2 (volume fraction) suspension of soil in demineralized water.
This method is applicable to all types of air-dried soil samples, for example as pretreated in accordance with ISO 11464.
For that purpose, 25 ml of the air-dried soil sample is mixed with 50 ml distilled water in an Erlenmeyer flask, and the suspension is shaken for 5 min. After this time, the electrode is immersed in the suspension and the oxidation redox potential is measured. It is important to stir the sample during the measurement to keep the suspension from settling.
Depending on the composition of the soil, the final value will be reached after 30-50 min. For this reason, the reading should only be taken after 50 min have elapsed.
IN_DEVELOPMENT
cen:proj:81762
00.60
Close of review
Apr 8, 2025
