Multi Detector Mass Spectrometer Isotope Ratio Precision
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Solution Overview
Problem
Current mass spectrometry techniques face challenges in achieving high precision and accuracy for isotope ratio measurements due to interference and contamination issues, especially when dealing with low analyte concentrations and isobaric interferences, which are not effectively resolved by existing sample preparation methods or collision cell technologies.
Innovation Solution
A mass spectrometer configuration that includes an inductively coupled plasma ion source, a quadrupole mass filter, a collision cell with reactive gases, and a multicollector system, which uses mass filtering and collisional focusing to selectively transmit ions and induce mass shifts, thereby improving specificity and reducing interferences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high mass resolution is used to separate isobaric interferences, then measurement precision is improved, but sensitivity is reduced due to narrow entrance slits
Solution Approach 1:
The patent divides the mass analysis function into two separate stages: a first mass filter (quadrupole) that performs preliminary mass selection with high transmission, and a second mass analyzer (sector field) that provides high mass resolution for interference separation. This segmentation allows each component to be optimized for its specific function without compromising the other.
Solution Approach 2:
The first mass filter acts as an intermediary between the ion source and the second mass analyzer. It pre-selects ions of interest and transmits them to the second analyzer, thereby protecting the high-resolution analyzer from being overwhelmed by the full ion beam and enabling it to operate at high resolution without sacrificing overall sensitivity.
2Measurement precision
If chemical sample preparation is performed to remove interferences, then measurement accuracy is improved, but device complexity and time consumption increase
Solution Approach 1:
The patent replaces mechanical/chemical sample preparation systems with a purely physical mass spectrometric approach. Instead of using chemical separation methods to remove interferences, the invention uses the combined power of two mass filters to physically separate and identify interfering ions based on their mass-to-charge ratios, thereby achieving high accuracy without additional preparation steps.
Solution Approach 2:
The first mass filter performs preliminary mass selection before the ions enter the second high-resolution analyzer. This preliminary action reduces the complexity of the subsequent analysis by pre-identifying and isolating ions of interest, allowing the second analyzer to focus on high-precision measurement without being burdened by the full complexity of the original sample matrix.
3Measurement precision
If narrow entrance slits are used in sector field mass spectrometers to achieve high mass resolution, then interference separation is improved, but ion transmission is significantly reduced
Solution Approach 1:
The patent segments the mass analysis function into two distinct stages: a first mass filter (quadrupole) that operates with wide acceptance angles and high transmission, and a second mass analyzer (sector field) that uses narrow slits for high mass resolution. This segmentation allows the first filter to compensate for the transmission losses of the second analyzer by pre-concentrating the ion beam.
Solution Approach 2:
The patent creates a composite mass analysis system combining two different mass filter technologies (quadrupole and sector field) into a single integrated instrument. Each technology contributes its strengths: the quadrupole provides high transmission and robustness, while the sector field provides high mass resolution, creating a composite system that achieves both goals simultaneously.
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 configuration enhances the precision and accuracy of isotope ratio measurements by effectively eliminating interferences and improving sensitivity, allowing for direct sample analysis without extensive chemical preparation, even in cases where high mass resolution is not feasible.
Implementation Method 1
The method involves ionizing the sample to be analysed with an inductively coupled plasma
Implementation Method 2
at least one mass filter downstream of the ion source and adapted to select ions from the beam by their mass-to-charge ratio (m/z)
Implementation Method 3
A target gas (molecular and/or atomic) is admitted into the collision cell, with the objective of promoting collisions between ions and the neutral gas molecules or atoms
Implementation Method 4
at least one sector field mass analyser arranged downstream of the collision cell
Implementation Method 5
at least one sector field mass analyser arranged downstream of the collision cell
Data Source
AI summary
The present invention can be directed to a mass spectrometer, relevant parts thereof like replacement kits or upgrading kits and/or mass spectrometry methods. A mass spectrometer according to the present invention can comprise at least one ion source for generating a beam of ions from a sample. Moreover at least one mass filter downstream of the ion source can be provided and adapted to select ions from the beam by their mass-to-charge ratio (m/z). Furthermore at least one collision cell arranged downstream of the mass filter can be arranged. At least one sector field mass analyser arranged downstream of the collision cell can be further provided and at least one ion multicollector comprising a plurality of ion detectors arranged downstream of the mass analyser, for detecting a plurality of different ion species in parallel and/or simultaneously.