Electrochemical Lead Sensor Using Underpotential Deposition
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Solution Overview
Problem
Current methods for detecting lead contamination in drinking water are expensive, require advanced instrumentation, and are not readily accessible for use in homes and offices, limiting the ability to accurately and affordably monitor lead levels at the point of use.
Innovation Solution
A portable electrochemical sensor system utilizing a copper working electrode and a counter electrode, which applies underpotential deposition of lead and measures the hydrogen evolution reaction (HER) current to detect and quantify lead levels in aqueous solutions, such as water, with high sensitivity and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If colorimetry, atomic absorption spectroscopy (AAS) or inductively coupled plasma (ICP) emission spectroscopy are used to detect lead concentration, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical/optical instrumentation (AAS, ICP) with an electrochemical sensing system that uses simple electrical measurements (current, potential) to detect lead concentration. The electrochemical cell with working electrode, counter electrode, and reference electrode substitutes for expensive spectroscopic equipment while maintaining measurement capability through voltage and current measurements rather than complex optical pathways
Solution Approach 2:
The invention employs disposable or easily replaceable electrochemical electrodes (working electrode with lead-selective membrane, counter electrode, reference electrode) that can be discarded after use. This eliminates the need for maintaining and calibrating expensive, complex instrumentation, as each electrode assembly serves as a low-cost, single-use sensing element that provides accurate lead concentration measurements without requiring advanced laboratory equipment
2Measurement precision
If colorimetry, atomic absorption spectroscopy (AAS) or inductively coupled plasma (ICP) emission spectroscopy are used to detect lead concentration, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent replaces complex mechanical/optical instrumentation (AAS, ICP) with an electrochemical sensing system that uses simple electrical measurements (current, potential) to detect lead concentration. The electrochemical cell with working electrode, counter electrode, and reference electrode substitutes for expensive spectroscopic equipment while maintaining measurement capability through voltage and current measurements rather than complex optical pathways
Solution Approach 2:
The electrochemical sensor performs self-measurement by directly contacting the water sample and generating electrical signals (current or potential change) that indicate lead concentration. The system requires minimal operator intervention - simply immersing the electrode assembly in the sample automatically initiates the measurement process, eliminating the need for complex sample preparation, instrument calibration, or specialized operational procedures required by traditional spectroscopic methods
3Manufacturing precision
If a copper working electrode with planar surface is used, then manufacturing precision is improved, but productivity deteriorates due to increased lead sensing time
Solution Approach 1:
The patent replaces the planar (flat) electrode surface with a dendritic surface that features numerous protrusions and increased surface area. This dendritic structure, formed by electrodeposition of zinc followed by copper coating, creates a three-dimensional irregular surface with many active sites for lead detection, thereby increasing the sensing rate and reducing measurement time while maintaining manufacturing feasibility through electrochemical deposition processes
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
The sensor effectively detects lead levels in the ppb range, providing a cost-effective, portable, and reliable solution for monitoring lead contamination in drinking water, enabling widespread access to accurate lead detection beyond traditional laboratory settings.
Implementation Method 1
The power supply is configured to apply underpotential deposition of lead onto the copper electrode
Implementation Method 2
The measuring device provides measurement of a hydrogen evolution reaction (HER) current on the Pbupd-modified electrode
Data Source
AI summary
A sensor for detecting lead in an aqueous solution includes a copper working electrode, a counter electrode, a power supply for applying underpotential deposition of lead onto the copper electrode, a measuring device for providing measurement of a hydrogen evolution reaction (HER) current on the Pbupd-modified electrode, and a controller configured to correlate the degree of suppression of the HER current to Pbupd coverage to determine the lead coverage and lead concentration of the solution.