ICP-MS Diagnostic System Using Sensitivity Envelope Calibration
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Solution Overview
Problem
Inductively coupled plasma mass spectrometers (ICP-MS) face challenges in analyzing high-matrix samples due to ion deposition and clogging issues, requiring effective dilution methods and parameter control to maintain measurement sensitivity and reproducibility, but existing methods are time-consuming and prone to errors.
Innovation Solution
A diagnostic and calibration system that optimizes plasma properties by storing aggregate parameter combinations for aerosol generation, including high-frequency power source output, carrier gas flow rate, and plasma torch distance, allowing for automated adjustment to maximize sensitivity and minimize oxide ions, using a sensitivity-oxide ion ratio graph for diagnostic measurement and calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If manual or automatic dilution is performed to analyze high-matrix samples, then the amount of matrix material entering the mass analysis part is reduced, but the analysis time increases and errors may occur
Solution Approach 1:
The system performs preliminary diagnostic measurements using stored parameter combinations to determine optimal plasma conditions before actual sample analysis. This preliminary calibration establishes the sensitivity-oxide ion ratio envelope and identifies maximum sensitivity points, eliminating the need for time-consuming manual dilution trials and reducing analysis time while maintaining accuracy.
Solution Approach 2:
The system changes plasma generation parameters (high-frequency power source output, carrier gas flow rate, plasma torch distance) to optimize the plasma state for analyzing high-matrix samples. By adjusting these parameters to achieve maximum sensitivity points on the envelope, the system can analyze concentrated samples without dilution, thereby reducing analysis time and avoiding dilution errors.
2Measurement precision
If multiple parameters are adjusted to optimize plasma state, then measurement sensitivity and reproducibility improve, but device complexity and operation difficulty increase
Solution Approach 1:
The system pre-stores multiple parameter combinations that represent different plasma states in a database. During operation, it automatically selects and applies the appropriate pre-defined parameter set based on diagnostic measurements, eliminating the need for operators to manually adjust multiple parameters and reducing operational complexity while maintaining measurement precision.
Solution Approach 2:
The system performs diagnostic measurements to determine the actual plasma state and compares it with the stored parameter combinations. It uses this feedback to automatically identify the optimal parameter set from the stored combinations and adjusts the plasma generation parameters accordingly, simplifying the operation while ensuring optimal measurement conditions are achieved.
3Measurement precision
If diagnostic measurements are performed with multiple parameter combinations, then accurate calibration is achieved, but measurement time increases
Solution Approach 1:
The system pre-calculates and stores multiple parameter combinations representing different plasma states before actual diagnostic measurements. During calibration, it only needs to perform measurements with these pre-defined combinations rather than exploring the entire parameter space, significantly reducing measurement time while maintaining calibration accuracy through the use of the pre-prepared parameter sets.
Solution Approach 2:
The system uses a limited set of pre-defined parameter combinations that are sufficient to characterize the plasma state envelope, rather than performing exhaustive measurements across all possible parameter values. This partial action approach achieves accurate calibration with fewer measurements, thereby improving diagnostic speed while maintaining precision.
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 system enables quick diagnosis and calibration of ICP-MS properties, improving reproducibility and reducing measurement fluctuations, allowing for efficient analysis of samples with varying matrix concentrations and simplifying maintenance operations.
Implementation Method 1
a plasma torch such that plasma is generated from the plasma gas and the aerosol is introduced into this plasma
Implementation Method 2
Once the plasma has been generated by the plasma gas through the operation of a work coil, the aerosol containing the sample is introduced and as a result, the metal in the sample is ionized and dispersed in the plasma
Implementation Method 3
The extracted ion beam is guided to the mass analyzer disposed at the subsequent part and the measurement process of mass analysis is performed
Data Source
AI summary
A diagnostic system designed such that an aggregate of parameter combinations is stored, which is an aggregate of combinations of parameters consisting of a first parameter for determining the output of the high-frequency power source, a second parameter for determining the flow rate of the carrier gas in the aerosol, and a third parameter for determining the distance between the plasma torch and the interface, and which forms a specific array such that the measurement points corresponding to the respective combinations are lined up in order along the direction of length of an envelope that forms the end on the high-sensitivity side of a graph drawn as an aggregate of all measurement points on a sensitivity-oxide ion ratio graph, and a diagnostic measurement is performed with a specific diagnostic sample using the parameter value of each combination of the above-mentioned parameter combinations that form the aggregate such that the device properties can be confirmed from the position on the envelope on the sensitivity-oxide ion ratio graph of the actual measurement points corresponding to each combination.