Membrane Filtration for Laser-Induced Breakdown Spectroscopy
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Solution Overview
Problem
Laser-induced breakdown spectroscopy (LIBS) faces challenges in analyzing liquid samples due to laser-induced splashing, which complicates accurate qualitative and quantitative analysis, and there is a need for improved sample preparation techniques that consider how laser energy affects material ejection and ablation efficiency.
Innovation Solution
A method involving the deposition of a fluid sample on well-characterized and defined membranes, followed by filtration or diffusion, and subsequent LIBS analysis to obtain spectra, allowing for the classification and identification of sample components based on particle size and composition using multi-variate analysis methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If LIBS is used to analyze liquid samples directly, then the technique maintains its advantage of little to no sample treatment, but laser-induced splashing occurs which complicates accurate qualitative and quantitative analysis
Solution Approach 1:
The patent applies preliminary action by depositing the liquid sample onto a solid substrate (such as a glass slide or membrane) before performing LIBS analysis. This pre-treatment step converts the liquid sample into a solid-like state that can be analyzed without laser-induced splashing, while still maintaining relatively simple sample preparation procedures. The sample is prepared in advance on a stable platform that prevents the splashing issue during laser irradiation.
2Measurement precision
If sample preparation techniques are implemented to improve LIBS analytical performance, then limits of detection and accuracy improve, but the operational cost and complexity of sample treatment increase
Solution Approach 1:
The patent introduces an intermediary substrate (solid support material) that mediates between the liquid sample and the laser beam. This intermediary serves multiple functions: it provides a stable platform that prevents laser-induced splashing, concentrates the liquid sample for better signal detection, and maintains sample integrity during analysis. Common intermediaries include glass slides, metal substrates, or porous membranes that are easy to handle and dispose of.
3Measurement precision
If conventional analytical techniques are used instead of LIBS, then analytical performance is reliable, but significant manipulation of specimens is required
Solution Approach 1:
The patent extracts the problematic liquid phase from the analysis process by transferring the liquid sample onto a solid substrate. This separation allows the sample to be analyzed in a solid-state configuration using LIBS, combining the reliability of conventional techniques with the simplicity of laser-based analysis. The liquid sample is effectively 'taken out' of the direct laser interaction path and replaced with a solid support that maintains sample composition information.
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 enhances the analytical performance of LIBS by providing richer information on sample components, improving limits of detection and accuracy, and enabling analysis of liquids and slurries, making LIBS more competitive with established techniques like XRF, ICP-OES, and ICP-MS.
Implementation Method 1
Laser-induced breakdown spectroscopy (LIBS) has been widely investigated in recent decades for different applications ranging from space exploration to biological specimens
Implementation Method 2
filtering the fluid sample through or diffusing the sample into one or more preferably non-magnetic or weakly magnetic membranes
Implementation Method 3
filtering the fluid sample through or diffusing the sample into one or more preferably non-magnetic or weakly magnetic membranes
Data Source
AI summary
A method of analyzing, preferably by laser induced breakdown spectroscopy (LIBS), fluid samples (e.g. liquids, solutions, melts or slurries) that contain soluble and insoluble components of various elemental, molecular and biological components using a pre-characterized, preferably non-magnetic, membrane or plurality of membranes each having different characteristics, such as different porosities. The fluid sample is first deposited on the one or more membranes and the components to be analyzed are retained thereon through filtration or diffusion and then analyzed, such as with LIBS. Different components, such as different sized particles, are fixed on different membranes depending on the characteristics (e.g. pore size) of the corresponding membrane, which provides pre-sorting of the components before LIBS analysis.