Microfluidic Organic Carbon Detector with UV Oxidation
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Solution Overview
Problem
Conventional organic carbon detectors for liquid chromatography are large in size, complex in structure, and have low time resolution, making them difficult to manufacture and inefficient in testing, with simultaneous oxidation and CO2 transfer processes leading to incomplete oxidation of organic matter.
Innovation Solution
An organic carbon detector with a microfluidic ultraviolet oxidation module and a separate inorganic carbon removal module, operating in a vacuum environment, allowing for real-time analysis and efficient oxidation of organic carbons with CO2 removal, utilizing a capillary wound in a helix or a quartz microfluidic chip for downsizing and improved manufacturing ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic carbon detectors use simultaneous oxidation and CO2 transfer in the same reactor, then the device can be compact, but the oxidation of organic matter becomes incomplete
Solution Approach 1:
The patent divides the detection system into two separate modules: an oxidation module where organic matter is completely oxidized to CO2, and a CO2 transfer module where the generated CO2 is transferred to carrier gas. This segmentation ensures complete oxidation while maintaining system compactness through modular design.
Solution Approach 2:
The oxidation module performs preliminary oxidation of organic matter before the CO2 transfer module operates. By completing oxidation in advance in a dedicated module, the system ensures complete conversion to CO2 before transfer, avoiding the incompleteness issue of simultaneous processing.
2Loss of time
If conventional detectors perform sequencing batch analysis, then inorganic carbon can be removed, but real-time analysis is not enabled and time resolution is low
Solution Approach 1:
The patent enables continuous real-time analysis by maintaining continuous flow of liquid sample through the oxidation module and continuous transfer of generated CO2 through the CO2 transfer module. This continuous operation eliminates the sequencing batch approach, achieving both real-time analysis and high testing efficiency.
Solution Approach 2:
The system dynamically processes samples in real-time as they flow through the modules, rather than performing static batch analysis. The continuous operation allows the system to adapt to varying sample flow rates and provide immediate results, significantly improving time resolution and productivity.
3Reliability
If conventional detectors use large motors and transmission units for oxidation, then oxidation can be effective, but the device size increases and manufacturing becomes difficult
Solution Approach 1:
The patent replaces mechanical oxidation systems (motors and transmission units) with a chemical oxidation approach using oxidants injected into the liquid sample. This substitution eliminates complex mechanical components, simplifying manufacturing while maintaining effective oxidation through chemical reactions.
Solution Approach 2:
The patent extracts and removes the mechanical oxidation components (motors, transmission units) from the system entirely, replacing them with a chemical oxidation module that uses injected oxidants. This extraction of unnecessary mechanical parts significantly reduces manufacturing complexity and device size.
4Loss of time
If conventional detectors mix samples at different times in the same reactor, then the device is simple, but sample contamination occurs and time resolution is reduced
Solution Approach 1:
The patent segments the detection process into separate oxidation and CO2 transfer modules, allowing samples to be processed at different times without mixing. This segmentation prevents contamination between samples while maintaining relatively simple device architecture through modular design.
Solution Approach 2:
The patent introduces a carrier gas as an intermediary medium to transfer CO2 from the oxidation module to the detection module. This intermediary allows temporal separation of sample processing while maintaining continuous operation, preventing sample mixing and contamination.
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 quicker, more sensitive, and real-time analysis of organic carbon levels, reducing manufacturing costs and improving time resolution by separating oxidation and CO2 removal processes, enabling nonstop analysis without the need for large motors or transmission units.
Implementation Method 1
The organic carbons may be oxidized by various methods such as ultraviolet oxidation
Implementation Method 2
the inorganic carbons are removed in a capillary in a vacuum environment
Implementation Method 3
The CO2 amount may be determined by non-dispersive infrared spectroscopy
Data Source
AI summary
Disclosed is an organic carbon detector that can be used with a liquid chromatography equipment such as a size exclusion chromatography. The organic carbon detector contains a carbon oxidization subsystem and a stripping and CO2 detection subsystem arranged and detachably connected with each other in said order. The carbon oxidization subsystem contains a microfluidic agent injection module (1), an inorganic carbon removal module (2), a microfluidic ultraviolet oxidation module (3) and a vacuum pumping system (4), configured to remove inorganic carbons and oxidize organic carbons. The stripping and CO2 detection subsystem contains a stripping module (7) and a CO2 detector (12), using a carrier gas to transfer the organic carbon converted gas to the CO2 detector (12). Also disclosed is a method of using the organic carbon detector in water quality monitoring.