Redox Indicator Sensor for Rapid PFAS Detection
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Solution Overview
Problem
Current methods for detecting per- and polyfluoroalkyl substances (PFAS) are expensive, time-consuming, and not suitable for field analysis due to their complexity and requirement for centralized laboratories, limiting effective monitoring and remediation efforts.
Innovation Solution
The use of redox indicators immobilized on electrodes for electrochemical detection of PFAS, enabling quantitative analysis with low-cost, portable sensors that can detect a broad range of PFAS compounds at low concentrations, including those below EPA limits, through electrostatic and fluoride-specific interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional chromatography-MS methods are used for PFAS detection, then measurement precision and reliability are improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the detection function from complex centralized laboratory systems to simple field-deployable test strips. The redox indicator-functionalized test strip isolates the essential detection capability, eliminating the need for expensive chromatography and mass spectrometry equipment while maintaining detection sensitivity through the specific redox reaction between the indicator and PFAS compounds.
Solution Approach 2:
The patent employs disposable test strips with immobilized redox indicators that provide single-use, field-portable detection. These inexpensive, disposable strips replace expensive, complex, and reusable laboratory instrumentation, enabling widespread deployment for environmental monitoring without requiring maintenance or skilled operation of sophisticated equipment.
2Measurement precision
If centralized laboratory analysis is used, then measurement precision is improved, but loss of time and productivity decrease
Solution Approach 1:
The patent incorporates preliminary action by pre-functionalizing test strips with redox indicators before use. The indicators are immobilized on the strip matrix in advance, ready to immediately react with PFAS compounds upon sample application. This pre-preparation eliminates time-consuming sample processing steps in the field and enables rapid detection within minutes, compared to hours or days for centralized laboratory analysis.
3Measurement precision
If complex chromatography systems are deployed, then measurement precision is improved, but ease of operation and accessibility worsen
Solution Approach 1:
The patent replaces complex mechanical and electronic laboratory systems (chromatographs, mass spectrometers) with a simple chemical-based test strip system. The detection mechanism relies on a straightforward redox reaction that produces measurable signals without requiring sophisticated instrumentation, making the system accessible to non-experts and suitable for field deployment by environmental personnel or community members.
4Measurement precision
If conventional detection methods are used, then measurement precision is improved, but cost per sample increases significantly
Solution Approach 1:
The patent uses inexpensive, disposable test strips that cost a fraction of conventional laboratory analysis per sample. The test strips employ affordable redox indicators and simple matrix materials, eliminating the need for expensive consumables like chromatography columns, mobile phases, and mass spectrometry calibration standards. This dramatically reduces the cost per sample while maintaining adequate detection sensitivity for environmental monitoring applications.
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
This approach allows for rapid, cost-effective, and sensitive detection of PFAS in various samples, including environmental and biological samples, providing improved spatial and temporal resolution for monitoring and remediation efforts, reducing testing costs by about 80% compared to conventional methods.
Implementation Method 1
The sensor comprises a conductive composite comprising an indicator incorporated within a working electrode... The indicator component comprises a broad family of compounds... which change the redox properties, color and redox current, in response to the presence of a particular, or a class of PFAS compounds
Implementation Method 2
the indicator component comprises a broad family of compounds including but not limited to: phenazine, coumarin, xanthene, anthraquinone, azo derivatives, benzothiazole phenotriazine, phenoxazine and selenium organic derivatives, or certain metal ions such as silver, copper, cerium, which change the redox properties, color and redox current, in response to the presence of a particular, or a class of PFAS compounds
Implementation Method 3
The present disclosure is directed to the use redox materials and coatings that react with PFAS through electrostatic and fluoride-specific interactions
Data Source
AI summary
A method and sensing system for the determination per and poly-fluoroalkyl substances (PFASs) is disclosed, wherein the probe is based on measurement of the redox activity of a redox indicator. The method includes adding a PFAS compound to an indicator solution, gel, 3D printed object, electrode or a sensing surface containing and measuring the change in the indicator signal as a function of PFAS concentration. Further provided is a portable sensor for rapid monitoring of the presence and PFAS concentrations. The present invention includes deposition of the indicator component within a method, assay, apparatus and sensing platform. Further provided is a composite electrode and sensor with binding and signaling activity for a broad range of PFAS, as well as printing ink compositions that incorporate the redox indicator.