Microbial Sensor Electrode Configuration for Soil Biochemical Monitoring
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Solution Overview
Problem
Existing microbial sensor systems are not suitable for monitoring soils, especially the rhizosphere and contaminated soils, nor can they directly measure biochemical characteristics of plants, limiting their effectiveness in assessing environmental health and remediation efforts.
Innovation Solution
A microbial sensing system comprising an indicator electrode, a reference electrode, and a signal acquisition module with high-impedance potentiometry, capable of measuring open-circuit voltage and recovery voltage, is used to characterize biochemical conditions in soils and plant tissues, allowing for the investigation of microbial activity, substrate concentrations, and other biochemical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional microbial sensor systems are used, then energy conversion from waste products is achieved, but the systems are not suitable for monitoring soils and plant tissues
Solution Approach 1:
The sensor system is designed with different electrode configurations and materials optimized for specific measurement environments. Indicator electrodes can be made from graphite, gold, platinum, titanium, or carbon fabrics, and the system can operate in different modes (open-circuit voltage, recovery voltage, controlled current) depending on whether it is monitoring soil, sediment, or plant tissue, allowing each local application to have the appropriate sensor characteristics
Solution Approach 2:
The microbial sensor system is designed to perform multiple functions across different environments. It can monitor biochemical characteristics in soils, sediments, and plant tissues using the same basic electrochemical platform, eliminating the need for environment-specific sensor designs and enabling universal application for environmental health assessment
2Measurement precision
If conventional sensors are used in aqueous environments, then biochemical conditions can be determined, but the sensors cannot directly measure biochemical characteristics of plants
Solution Approach 1:
The system changes its operational parameters when measuring plant tissues versus soils. It can switch between open-circuit voltage mode, recovery voltage mode, and controlled current mode depending on the measurement target, and adjusts electrode materials and configurations to optimize for the specific electrical and biochemical properties of plant tissues
Solution Approach 2:
The system uses indicator electrodes that can directly contact plant tissues, serving as intermediaries between the measurement system and the plant's internal biochemical environment. These electrodes facilitate direct electrical contact with plant cells and tissues, enabling measurement of internal plant biochemical characteristics without requiring tissue extraction or destruction
3Measurement precision
If high-impedance potentiometry is used, then open-circuit voltage measurements are achieved, but device complexity increases
Solution Approach 1:
The system replaces complex mechanical measurement systems with electrochemical sensing. Instead of using complex physical measurement devices, it uses electrochemical cells with indicator and reference electrodes that naturally generate electrical signals through biochemical reactions, simplifying the overall measurement system while maintaining high precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables effective monitoring of rhizosphere and plant health by providing detailed biochemical data, including microbial compositions and disease detection, facilitating environmental assessments and remediation strategies.
Implementation Method 1
signal acquisition module electrically coupled to the indicator electrode and the reference electrode, wherein the signal acquisition module comprises measurement circuitry that comprise a high-impedance potentiometer, having an impedance greater than or equal to 10 megaohms
Implementation Method 2
measuring a potential difference between the indicator electrode and a reference electrode
Data Source
AI summary
A microbial sensor, microbial sensing system, and method that can be used to determine the chemical environment of unsaturated soils, rhizosphere, and/or plants are disclosed. The microbial sensing system can be used for monitoring the health of plants including nutrients, salinity, contaminants, chemicals (pesticides, herbicides) and diseases. A microbial sensing system can include one or more indicator electrodes and a reference electrode. The microbial sensing system can include a signal acquisition and/or communication module to allow the real-time collection of data from field deployments and laboratory investigations.