Capillary Electrophoresis ICPMS Direct Coupling
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Solution Overview
Problem
Current isotope measurement methods using ICPMS spectrometry face challenges with resolution and reproducibility, particularly when dealing with solutions containing isobaric interference, as direct coupling results in unstable signals and indirect coupling requires time-consuming fraction collection and treatment.
Innovation Solution
A method combining capillary electrophoresis using isotachophoresis mode with direct coupling to ICPMS spectrometry, where the solution is separated between terminating and leading electrolytes of different mobilities, allowing for continuous isotope measurement with a constant signal amplitude, enhancing reproducibility and reducing analysis time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct coupling between capillary electrophoresis and ICPMS is used, then analysis time is reduced and automation is improved, but signal stability and measurement precision deteriorate due to transient signal variations during elution
Solution Approach 1:
The method performs preliminary separation of charged species by capillary electrophoresis before introduction to the ICPMS spectrometer. This pre-separation ensures that species are organized into distinct zones before measurement, allowing the ICPMS to detect stable signals from separated zones rather than dealing with mixed transient signals, thus improving reproducibility while maintaining fast analysis
Solution Approach 2:
The capillary electrophoresis device acts as an intermediary between the sample introduction and ICPMS detection. It separates charged species into distinct zones based on their electrophoretic mobility, and the interface between these zones serves as a controlled transition that maintains signal stability during direct coupling measurement, resolving the contradiction between speed and precision
2Measurement precision
If indirect coupling with fraction collection is used, then measurement precision is improved through continuous signals from homogeneous fractions, but analysis time increases and automation becomes difficult
Solution Approach 1:
The method extracts the fraction collection and treatment steps from the overall analysis process by implementing direct coupling. The capillary electrophoresis separates species into distinct zones that are directly introduced to the ICPMS without intermediate collection and treatment, eliminating time-consuming manual operations while maintaining measurement precision through the stability of separated zones
Solution Approach 2:
The method establishes continuous action by directly coupling the capillary electrophoresis outlet to the ICPMS spectrometer inlet. Species are continuously separated and detected in real-time without interruption for fraction collection, drying, and reconstitution, thereby reducing analysis time while maintaining precision through the continuous monitoring of separated zones
3Manufacturing precision
If separation technique is applied to resolve isobaric interference, then measurement resolution is improved, but device complexity and operational difficulty increase
Solution Approach 1:
The capillary electrophoresis device serves multiple functions: it separates charged species based on electrophoretic mobility, concentrates them into distinct zones, and provides a continuous flow interface to the ICPMS. This multi-functionality achieves high resolution for isobaric interference without requiring additional complex separation or detection equipment
Solution Approach 2:
The method replaces complex mechanical fraction collection and treatment mechanisms with an electrophoretic separation system that uses electric fields to separate and transport species. This substitution eliminates the need for mechanical fraction collectors, drying systems, and reconstitution equipment, reducing device complexity while maintaining high resolution
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 improves the resolution and reproducibility of isotope measurements by maintaining a stable signal amplitude and reducing analysis time, achieving results comparable to indirect coupling while eliminating the need for fraction collection.
Implementation Method 1
separating the species by using the capillary electrophoresis device according to the isotachophoresis mode
Implementation Method 2
The plasma torch contains a gas that, under the action of an electrical discharge and a radiofrequency field, generates a plasma that ionizes, with close to 100% efficiency, all or some of the elements introduced into to the torch
Implementation Method 3
The ions thus formed are then analyzed by the mass spectrometer portion that detects each ion according to its mass-to-charge ratio
Data Source
AI summary
A method for isotope measurement of charged species contained in a solution to be analyzed, particularly charged species having an isobaric interference, has the following consecutive steps:a) in the capillary of a capillary electrophoresis device, the solution to be analyzed is inserted contiguously between a terminating electrolyte and a leading electrolyte that, respectively, are placed after the inlet and before the outlet of the capillary and contain ions of the same charge but with mobility inferior and superior to those of said species;b) separating the species by using the capillary electrophoresis device according to the isotachophoresis mode; thenc) in the continuity of the preceding step, performing an isotope measurement of the species detected in the form of a substantially constant amplitude signal by using an inductively coupled plasma mass spectrometer (ICPMS) connected by direct coupling with the capillary electrophoresis device.