ICP-MS Control Device for High-Matrix Sample Analysis
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Solution Overview
Problem
Conventional inductively coupled plasma mass spectrometers (ICP-MS) face challenges in analyzing high-matrix samples due to ion deposition and clogging issues, requiring manual or automated dilution processes that are time-consuming and prone to errors, limiting their ability to handle samples with high matrix concentrations effectively.
Innovation Solution
An ICP-MS system with a control device that adjusts the amount of liquid drops, carrier gas flow rate, RF power output, and plasma torch position to optimize ion sensitivity, allowing for continuous analysis of samples with varying concentrations without additional dilution equipment or lengthy procedures, thereby maintaining high sensitivity and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional ICP-MS analyzes high-matrix samples directly, then analysis capability is maintained, but ion deposition and clogging occur making analysis impossible
Solution Approach 1:
The patent implements dynamic control of plasma generation conditions (RF power, gas flow rates, nebulizer parameters) to adapt to varying sample matrix concentrations. The system automatically adjusts operating parameters in real-time to maintain optimal ionization efficiency while preventing ion deposition and clogging, enabling continuous analysis of high-matrix samples without manual intervention
Solution Approach 2:
The system changes multiple operating parameters simultaneously including RF power output, carrier gas flow rate, auxiliary gas flow rate, and nebulizer parameters to optimize plasma conditions for high-matrix samples. These parameter changes prevent ion deposition on cones and maintain orifice patency, solving the reliability issue while preserving analysis capability
2Object-affected harmful factors
If manual or automated dilution is used for high-matrix samples, then ion deposition is reduced, but analysis time increases and errors occur
Solution Approach 1:
The patent extracts and removes excess liquid from the sample introduction system through optimized nebulization and spray chamber design. This reduces the total dissolved solids entering the plasma without requiring external dilution equipment, eliminating the time loss and error risks associated with manual or automated dilution while effectively reducing ion deposition
Solution Approach 2:
The system performs self-regulation of sample concentration through automatic control of nebulization efficiency and aerosol generation. The control device monitors plasma conditions and automatically adjusts operating parameters to maintain optimal sample introduction rates, eliminating the need for external dilution operations and their associated time losses
3Productivity
If high concentrations are analyzed directly, then productivity is maintained, but sensitivity reduction occurs due to matrix effects
Solution Approach 1:
The system dynamically changes plasma generation parameters (RF power, gas flows) and detection parameters to compensate for matrix effects at high concentrations. This maintains ionization efficiency and detection sensitivity across a wide concentration range, enabling continuous analysis of high-matrix samples without sensitivity loss
Solution Approach 2:
The patent implements dynamic optimization of plasma conditions and detection parameters in real-time based on sample matrix concentration. The control device continuously adjusts operating parameters to maintain optimal sensitivity for quantification, allowing direct analysis of high-concentration samples without dilution while preserving measurement 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
Enables the analysis of high-matrix samples with concentrations up to 20,000 to 30,000 ppm without dilution, ensuring good reproducibility and precision by adjusting ion flow through comprehensive control of plasma conditions, eliminating sensitivity reduction from matrix effects and allowing continuous analysis of samples across a wide concentration range.
Implementation Method 1
a work coil connected to a high-frequency power source; plasma is generated by the plasma gas through the operation of a work coil
Implementation Method 2
plasma is generated from the plasma gas and the aerosol is introduced into this plasma; the metal in the sample is ionized and blew out into the plasma
Data Source
AI summary
An inductively coupled plasma mass spectrometer comprises a control device 70 for collectively controlling each of the following factors: the amount of liquid drops in the aerosol that is to be supplied to a plasma torch 20, the flow rate of carrier gases 76A and 76B in this aerosol, the RF output of a high-frequency power source 80, and the distance Z between plasma torch 20 and sampling interface 15 and 16.