Nitrate Ion Adduct Formation for Explosive Detection
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Solution Overview
Problem
Current analytical techniques for detecting explosives and threat agents at trace levels lack sufficient sensitivity and selectivity, particularly in real-time applications, as they often fail to differentiate between threat agents and chemical noise, limiting their practical use in automated systems.
Innovation Solution
A method and system utilizing nitrate ions to selectively bind with explosive analytes in a gas-phase sample, providing a residence time of at least 0.10 seconds in a reaction region between an ion source and detector to form adduct ions, which are then detected to determine the presence of explosives at concentrations below 100 parts-per-trillion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional analytical techniques are used for trace detection, then the system structure is simple, but the detection sensitivity and selectivity are insufficient
Solution Approach 1:
The patent introduces a reaction region with carrier gas as an intermediary between the ion source and detector. The carrier gas facilitates the formation of reactant ions that selectively bind to explosive analytes, enhancing detection sensitivity while maintaining a relatively simple overall system structure
Solution Approach 2:
The detection system is segmented into distinct functional regions: ion source, reaction region, and detector. This segmentation allows each component to perform its specific function optimally, with the reaction region providing the necessary residence time for selective ion-analyte interactions without complicating the entire system
2Measurement precision
If the residence time of reactant ions is increased to form adduct ions, then the detection selectivity improves, but the analysis time increases
Solution Approach 1:
The patent optimizes the residence time parameter to a specific range (0.10-30 seconds) that provides sufficient time for selective adduct ion formation while maintaining practical analysis speeds. This parameter optimization achieves both high detection selectivity and acceptable analysis time
3Measurement precision
If the detection limit is reduced to below 100 ppt, then the detection sensitivity improves, but the chemical noise increases
Solution Approach 1:
The patent converts the potential harm of chemical noise into a benefit by using selective ion-molecule reactions in the reaction region. The reactant ions selectively bind to explosive analytes even at concentrations below 100 ppt, while the selective nature of these reactions filters out chemical noise, achieving ultra-trace detection with maintained signal quality
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
Enables real-time detection of explosives at parts-per-trillion levels with improved selectivity, reducing chemical noise and enhancing detection sensitivity while maintaining specificity, allowing for the identification of explosives and other threat agents in complex environments.
Implementation Method 1
ionizing the carrier gas with the ion source to form reactant ions which are nitrate (NO3-) ions
Implementation Method 2
forming chemical adduct ions between the reactant ions and the at least one explosive analyte
Data Source
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AI summary
A system and method are disclosed that provide selective detection of gas-phase target analytes at concentrations below 1 part-per-trillion including explosives, explosives compounds, and other threat agents. The invention involves formation of chemical adduct ions between reactant ions and target analytes that permit detection of the target analytes in a sample.