Microplasma Desorption Optical Emission Spectroscopy
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Solution Overview
Problem
Current analytical chemistry methods for ambient desorption/ionization-mass spectrometry (ADI-MS) are complex, require multiple steps, and are not suitable for field applications due to high sample preparation needs, potential contamination, and limited lateral resolution/selectivity, especially when dealing with small sample sizes and non-conductive samples.
Innovation Solution
A method and system utilizing a liquid sampling-atmospheric pressure glow discharge (LS-APGD) device for single-step volatilization and excitation of solid samples, combined with optical emission spectroscopy for direct analysis, allowing for portable and low-energy elemental analysis without sample relocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mass spectrometry is used for analysis after ADI, then analytical sensitivity and detection capability are improved, but device complexity and multi-step process requirements worsen
Solution Approach 1:
The patent combines the ADI source and spectroscopic detector into a single integrated system, eliminating the need for separate mass spectrometry instrumentation and sample transfer mechanisms. The microplasma source directly couples with the optical detector through a shared glow discharge space, reducing device complexity while maintaining analytical capability
Solution Approach 2:
The patent replaces the mechanical sample transfer system required for mass spectrometry with a direct optical detection system. Instead of physically relocating ionized samples to an MS analyzer, the system uses optical emission spectroscopy to detect excited species in situ within the glow discharge space, eliminating complex mechanical coupling and transfer mechanisms
2Measurement precision
If ADI-MS protocols are used for field analysis, then analytical capability is improved, but sample preparation requirements and contamination risk worsen
Solution Approach 1:
The microplasma source performs both desorption and excitation functions within a single glow discharge space, eliminating the need for separate sample preparation steps. The system directly analyzes samples in their native state without requiring prior volatilization or ionization steps, enabling field-deployable operation with minimal sample handling
Solution Approach 2:
The LS-APGD device serves multiple functions simultaneously: it acts as both the desorption source and the excitation source for spectroscopic detection. This multi-functional design eliminates the need for separate preparation instruments and reduces the overall complexity of field analysis protocols
3Measurement precision
If multi-step ADI-MS process is used, then ionization efficiency is improved, but analysis time and energy consumption worsen
Solution Approach 1:
The patent merges the desorption and excitation steps into a single simultaneous process within the glow discharge space. The microplasma provides both the energy for desorption and the excited electrons for species excitation in one unified mechanism, eliminating sequential multi-step processing and reducing total analysis time
Solution Approach 2:
The glow discharge operates continuously to provide sustained plasma conditions that simultaneously maintain desorption and excitation processes. This continuous action eliminates the need for alternating between different ionization modes or repeated sample introduction cycles, improving temporal efficiency
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
This approach simplifies the analysis process, reduces errors, and enables accurate, consistent results with small sample sizes, suitable for field applications, and is cost-effective with low energy consumption, providing a broad spectrum of analytical capabilities for metals and diverse sample matrices.
Implementation Method 1
the microplasma can contact a solid sample that is within the glow discharge space so as to volatize the solid sample
Implementation Method 2
excite the released components in a single step. The excited sample can then emit a characteristic response while still in the glow discharge space
Data Source
AI summary
Described is an elemental analysis system and methods for use thereof that can be utilized in examination of samples in their native state. The systems utilize a liquid sampling—atmospheric pressure glow discharge (LS-APGD) device for ambient desorption sampling and excitation of a solid sample in combination with optical emission detection. This approach can find application across a broad spectrum of analytical challenges including metals, soils, and volume-limited samples.