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Continuous Multiple Measurement of Soil Redox Potential Using Platinum Microelectrodes

Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada, 2560 Hochelaga Blvd., Sainte-Foy, QC, Canada G1V 2J3

View larger version (28K): [in a new window]   Fig. 1. Schema of the electronic circuitry used as interface between the pairs of Pt microelectrodes and reference electrodes and the multiplexer-data logger assembly. The set of six microelectrodes and reference electrodes connected to the interface includes resistors (R) of 10 x 106 ohms (1%). The seven reference electrodes are connected to ON/OFF switch (S). H1 means high terminal of Channel 1 and L1 means low terminal of Channel 1. H1 COM means high terminal of Common Line 1 and L1 COM means low terminal of Common Line 1 of the multiplexer. 1H1 and 1L1 are the differential channels of the multiplexer sequentially connected to the Common Line 1.

View larger version (60K): [in a new window]   Fig. 2. Redox potentials (EH, mV) continuously logged at three soil depths (0.05, 0.20, and 0.30 m eight Pt microelectrodes) during 2952 h of field experiment in an anaerobic environment.

View larger version (26K): [in a new window]   Fig. 3. Redox potentials (EH, mV) continuously logged in a laboratory experiment using a stabilization interface. Measurements of Pt microelectrodes (1 to 5) connected to the interface are indicated by cross symbol and thin black lines, noninterfaced Pt microelectrodes (7 to 12) are indicated by open triangles wide gray lines.