A custom soil electrochemical profiling system for detecting electrochemical activity changes in soil.

Area of Science:

• Environmental Science
• Electrochemistry
• Soil Science

Background:

• Physicochemical soil properties critically influence biogeochemical processes.
• Depth-dependent soil variations necessitate specialized tools for electrochemical analysis.
• Existing electrochemical profiling systems often face limitations in range, cost, and flexibility.

Purpose of the Study:

• To develop a practical, low-cost, and flexible electrochemical profiling system for water-saturated soils and conductive porous media.
• To enable depth-resolved measurements of electrochemical parameters in soil environments.
• To overcome limitations of existing systems in terms of travel range, automation, and cost.

Main Methods:

• Custom-built Soil Electrochemical Profiling System (SEPS) using off-the-shelf components.
• Integration with a potentiostat for redox profiling, cyclic voltammetry, and chronoamperometry.
• Testing with standards, hydrogels, and proof-of-concept soil mesocosms.

Main Results:

• SEPS demonstrated a vertical travel range of 27 cm with 25 μm precision.
• The system successfully resolved time- and depth-dependent redox changes and voltammetric responses in soil.
• Proof-of-concept applications showed SEPS's capability in analyzing biofilm enrichment and chronoamperometric data.

Conclusions:

• SEPS offers a practical and affordable platform for electrochemical profiling in saturated soils, sediments, and hydrogels.
• The system provides valuable insights into depth-resolved biogeochemical processes.
• SEPS facilitates advanced research in soil science and related fields.