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Depolarization of a platinum electrode in soils and its utilization for the measurement of redox potential
Author(s) -
ZHIGUANG LIU,
TIANREN YU
Publication year - 1984
Publication title -
journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 0022-4588
DOI - 10.1111/j.1365-2389.1984.tb00304.x
Subject(s) - electrode , depolarization , polarization (electrochemistry) , quinhydrone electrode , glass electrode , electrode potential , platinum , reference electrode , standard hydrogen electrode , analytical chemistry (journal) , absolute electrode potential , chemistry , standard electrode potential , anode , materials science , cathodic protection , electrochemistry , environmental chemistry , biophysics , biochemistry , catalysis , biology
SUMMARY The platinum electrode was polarized by a current flowing through the electrode‐soil solution interface, and then the change in electrode potential caused by soil constituents diffusing from the bulk soil to the electrode surface (depolarization) was monitored. The speed of depolarization was dependent on the kind and concentration of depolarizers, and was affected by some physical conditions of the soil. Within the time interval of 3–10 min the change in electrode potential with the logarithm of time followed a straight line, and the intersection point of the two lines after anodic polarization and cathodic polarization was taken as the equilibrium electrode potential, i.e. the Eh of the soil.