Pulsed Ion Detector for Liquid and Ion Chromatography
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Solution Overview
Problem
Current detectors for liquid chromatographs are not universally applicable and face challenges with sensitivity and stability, particularly in transitioning between high performance liquid chromatograph and ion chromatograph systems, with existing detectors being either too sensitive or unstable and lacking multipurpose functionality.
Innovation Solution
A pulsed ion multifunctional detector with a central controller, detection cell, and operational amplifiers that automatically subtract baseline background and eliminate dynamic noise, allowing for improved sensitivity and stability, and enabling use in both high performance liquid chromatograph and ion chromatograph systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conductivity detector is used for ion chromatograph detection, then ion detection capability is achieved, but sensitivity is far below various detectors in liquid chromatograph and unable to subtract large scale baseline background
Solution Approach 1:
The patent introduces an electrolytic cell as an intermediary device that converts mobile phase components into ions through electrolysis. This mediator enables the conductivity detector to achieve high sensitivity by generating detectable ion signals from non-ionic or low-ionic mobile phases, while the system automatically subtracts the large baseline background signal through differential measurement techniques.
2Adaptability or versatility
If an ultraviolet absorption detector is used, then liquid chromatograph detection capability is achieved, but it has no ultraviolet absorption of the ion chromatographic sample and cannot be applied to ion chromatograph
Solution Approach 1:
The patent creates a universal detector system that can function for both liquid chromatograph and ion chromatograph applications. The electrolytic cell-based detector achieves this by being able to detect both UV-absorbing compounds (through coupled UV detection) and ionic compounds (through conductivity detection after electrolysis), eliminating the need for separate detectors for different chromatograph types.
Solution Approach 2:
The system changes detection parameters dynamically based on the application. For liquid chromatograph, it operates in UV absorption mode or electrolytic conductivity mode depending on sample properties. For ion chromatograph, it switches to conductivity detection mode where the electrolytic cell generates ionic signals from separated ions, enabling accurate detection across different chromatograph types.
3Measurement precision
If electrochemical detector is used for ion chromatograph, then ion detection is achieved, but stability and sensitivity are influenced by chemical reaction of electrodes over time and require frequent cleaning
Solution Approach 1:
The electrolytic cell is designed with self-regenerating electrodes that undergo reversible chemical reactions. The electrodes automatically restore their active state through the electrolytic process itself, eliminating the need for frequent manual cleaning. The system maintains stable sensitivity over time through this self-service mechanism, where the electrochemical reactions are designed to be reversible and non-degradive to the electrode materials.
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 detector achieves enhanced sensitivity and stability, effectively overcoming the sensitivity-stability tradeoff and enabling accurate detection of sample components across various mobile phase proportions, thus extending its application range to both high performance liquid chromatograph and ion chromatograph systems.
Implementation Method 1
a first electrode and a second electrode provided in the detection cell, and used for ionizing the solution in the detection cell
Data Source
AI summary
A pulsed ion multifunctional detector used for both high performance liquid chromatograph and ion chromatograph, and experiment chromatograms attached also show that the detector has excellent multipurpose function in liquid chromatograph. The casing of the instrument is provided with a sample solution inlet, a sample solution outlet, a power supply socket, a liquid crystal display, an operation keyboard and a detection signal output interface. In the casing is provided a detection electromechanical member, which includes a central controller, a detection cell, a preposed subtracting module, a polarity transformation module, a noise processing module and an output amplifier module. The pulsed ion multifunctional detector can sensitively and accurately measure ion current of sample ionized directly in the detection cell, and subtract baseline background generated by various mobile phases and automatically eliminate dynamic noise and drift of the instrument.