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Measurement of redox potential inside a suction probe
Author(s) -
Uhlig Christian,
Wriedt Gunter,
Baumgartl Thomas,
Horn Rainer
Publication year - 2002
Publication title -
journal of plant nutrition and soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 1436-8730
DOI - 10.1002/1522-2624(200202)165:1<35::aid-jpln35>3.0.co;2-k
Subject(s) - redox , suction cup , chemistry , suction , electrode , ceramic , analytical chemistry (journal) , thermodynamics , chromatography , physics , inorganic chemistry , organic chemistry , quantum mechanics
Ceramic suction probes were combined with internal redox electrodes in order to reduce the deviation between site parallels, and to relate redox potential measurements directly to the solution analyzed chemically. In a laboratory experiment soil material was water‐saturated for 49 days and temporal changes of redox potential and pH outside and inside the ceramic suction probes were recorded. Furthermore, iron concentrations inside the ceramic cups were detected. Results indicate that a device combining ceramic suction probes and redox electrodes is in principal possible. However, the device used here could not reduce the deviation between site replications compared to free installed redox electrodes. Increasing iron concentrations due to decreasing redox potentials outside and inside the ceramic suction probes indicate that the soil water iron dynamic is at least partly measurable using this device.