Nozzle Electrode Ionization for Gas Chromatography Analytes
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Solution Overview
Problem
Current ionization techniques in gas chromatography, such as atmospheric pressure chemical ionization, lack flexibility and sensitivity selectivity, particularly when dealing with analyte molecules in a flow of gas, and do not allow for independent adjustment of polarity, pH, and salt content for optimal ionization.
Innovation Solution
An apparatus with a nozzle electrode arranged near the outlet of a chromatography column, capable of electrospray or chemical ionization, where the inlet tube and nozzle electrode are concentric, allowing for coaxial discharge of gas and fluid, enabling ionization of analyte molecules by electrospray or chemical ionization techniques, with a mass spectrometer for detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If atmospheric pressure chemical ionization is used for ionizing analyte molecules in gas chromatography effluent, then ionization can be achieved, but flexibility and sensitivity selectivity are limited and cannot be adjusted independently
Solution Approach 1:
The ionization system is segmented into separate functional components: a liquid delivery system that introduces liquid independently of the chromatography flow, and a corona discharge electrode for ionization. This segmentation allows independent optimization of liquid parameters (polarity, pH, salt content) without affecting the chromatography separation, thereby improving ionization flexibility while maintaining manageable system complexity
Solution Approach 2:
An intermediary liquid phase is introduced between the gas chromatography effluent and the ionization process. This liquid acts as a mediator that can be independently optimized with specific polarity, pH, and salt content to enhance ionization selectivity and sensitivity for different analyte types, resolving the contradiction between flexibility and complexity
2Measurement precision
If traditional ionization techniques are used, then analyte molecules can be ionized, but sensitivity and selectivity are compromised
Solution Approach 1:
The invention enables independent adjustment of multiple liquid parameters (polarity, pH, salt content) to optimize ionization conditions for different analyte types. By changing these parameters, the system achieves both high sensitivity and high selectivity, resolving the contradiction between measurement precision and adaptability
Solution Approach 2:
The system uses composite ionization conditions combining corona discharge with optimized liquid phases having specific polarity, pH, and salt content characteristics. This composite approach enhances both sensitivity and selectivity by leveraging the synergistic effects of electrical discharge and tailored liquid chemistry
3Adaptability or versatility
If liquid is introduced for electrospray ionization within the chromatography flow, then ionization can occur, but the polarity, pH, and salt content cannot be independently varied
Solution Approach 1:
The liquid introduction is segmented from the chromatography flow path. The liquid is delivered through a separate capillary positioned within or near the effluent flow, allowing independent control of liquid parameters without interfering with the chromatography separation process, thus maintaining productivity while achieving parameter versatility
Solution Approach 2:
The liquid delivery function is extracted from the chromatography system and implemented as an independent auxiliary system. This extraction allows the liquid parameters to be optimized for ionization purposes without constraining the chromatography method development, resolving the contradiction between adaptability and productivity
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
Provides flexible and sensitive ionization of analyte molecules, allowing for adjustment of ionization conditions like polarity and pH, enhancing selectivity and sensitivity compared to traditional methods, and decoupling liquid introduction from chromatography for improved analysis.
Implementation Method 1
a nozzle electrode can be arranged near the outlet of chromatography column and configured such that analyte molecules in a flow of gas, such as the effluent from a gas chromatography column, can be ionized by electrospray or chemical ionization techniques
Implementation Method 2
the analyte molecules are ionized by chemical ionization using a corona discharge provided via the nozzle electrode
Data Source
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AI summary
An apparatus for ionizing analyte molecules comprised in a flow of a first gas. The apparatus includes an inlet tube through which the first gas may be discharged into an ionization region. The apparatus also includes a nozzle electrode disposed around the inlet tube to define a substantially annular space between the exterior of the inlet tube and the interior of the nozzle electrode. The sheath tube includes an inlet for introducing a fluid into the substantially annular space and an outlet through which the fluid may be discharged into the ionization region. The apparatus is configured to ionize the analyte molecules optionally via electrospray or chemical ionization.