Multimethod Ionization Device for Trace Substance Detection
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Solution Overview
Problem
Current ionization devices face challenges in reliably detecting trace-level concentrations of substances, such as illicit substances, due to high detection limits and lengthy analysis times, which complicates their use in atmospheric research and security applications.
Innovation Solution
A multimethod ionization device (MID) that utilizes multiple reagent ion species and ionization schemes, allowing for controlled and simultaneous ionization processes, which enhances the formation of analyte adducts and reduces detection time by using electric fields and sheath flows to guide ions to a mass spectrometer for analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detection time is increased to improve reliability of trace-level substance detection, then detection reliability is improved, but analysis time becomes excessively long
Solution Approach 1:
The ionization process is segmented into multiple independent ionization zones, each employing a different ionization scheme (chemical ionization, photoionization, corona discharge). This allows simultaneous execution of multiple ionization methods on the same sample, thereby improving detection reliability for trace-level substances without extending analysis time, as all ionization processes occur in parallel within the single device.
Solution Approach 2:
The device is designed as a universal ionization system that can perform multiple ionization functions simultaneously using different reagent ions (NO3-, I-, Br-, ClO4-). This multi-functional capability enables the device to detect various trace-level substances with different detection limits and time requirements through a single integrated system, resolving the contradiction between reliability and analysis time.
2Measurement precision
If detection limit is reduced to detect trace-level substances, then detection capability is improved, but detection time increases
Solution Approach 1:
The detection system is segmented into multiple ionization schemes operating in parallel, each optimized for different detection limits. By distributing the detection task across multiple ionization methods (chemical ionization for certain compounds, photoionization for others, corona discharge for general ionization), the system achieves ultra-low detection limits for trace substances without requiring extended detection time, as all schemes process the sample simultaneously.
Solution Approach 2:
The device employs parameter changes by switching between different reagent ion types (NO3-, I-, Br-, ClO4-) and ionization methods to optimize detection limits for specific trace substances. This allows the system to achieve ultra-low detection limits (parts per trillion or quadrillion) for targeted substances while maintaining rapid detection times through selective parameter adjustment rather than prolonged analysis.
3Reliability
If multiple ionization schemes are used simultaneously to improve detection capability, then detection reliability is improved, but device complexity increases
Solution Approach 1:
Multiple ionization schemes (chemical ionization, photoionization, corona discharge) and multiple reagent ion sources are merged into a single integrated ionization device with a unified structure. This consolidation allows the system to achieve improved detection reliability through multiple simultaneous ionization methods while avoiding the complexity of multiple separate devices, as all components are coordinated within one compact system featuring shared sample introduction and detection pathways.
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 MID device improves the visibility of analyte species in mass/charge ratio spectra, enabling the detection of trace-level substances like explosives and narcotics at ultra-low concentrations, and simplifies cluster analysis in security applications while maintaining effectiveness in atmospheric research.
Implementation Method 1
The ions are formed from HN03 by radiation as described as such
Implementation Method 2
The ions are formed from HN03 by radiation as described as such
Implementation Method 3
utilizing corona discharge, UV, radioactive sources
Implementation Method 4
CI is based on the analyte molecule reaction with the separately produced ionizing ion to form an adduct carrying a charge
Implementation Method 5
The charged adduct is guided, in an analyte carrying flow, with or without electric fields to a mass spectrometer
Implementation Method 6
a mass spectrometer arranged to measure the mass/charge ratio and consequently to recognize the molecules as based on the ratio
Data Source
Figure 1
Figure 1A
Figure 1B~6
AI summary
The invention relates to Multimethod ionization Device (MID) to utilize at least chemical ionization and a system further utilizing such a device provided with a reaction chamber for ion formation of reagent species (R1, R2) for adduct formation from at least one analyte to be characterized as based on mass to charge ratio for the analyte identification.