Syringe Pump Flow Rate Control for ICP Sample Intensity
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Solution Overview
Problem
In Inductively Coupled Plasma (ICP) spectrometry, sample introduction systems face challenges in maintaining accurate quantitative analysis when sample intensities differ significantly from standard intensities, leading to reduced accuracy and reliability, especially when intensity differences exceed 10%, and manual dilution methods are inefficient and wasteful.
Innovation Solution
An automatic control system for sample introduction systems, utilizing a syringe pump and controller to adjust flow rates based on intensity measurements from ICP-MS or ICP-AES, ensures that sample intensities are maintained within a threshold difference of standards by adjusting the flow rate of the sample solution, thereby maintaining accurate analysis without the need for manual dilution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual dilution methods are used to adjust sample intensity, then sample intensity can be matched to standards, but the process is inefficient and wasteful
Solution Approach 1:
The patent replaces manual mechanical dilution operations with an automated electronic control system that uses a syringe pump to precisely control sample flow rate. The controller automatically adjusts the flow rate based on intensity measurements from the ICP-MS or ICP-AES system, eliminating the need for manual dilution steps while maintaining accurate quantitative analysis.
Solution Approach 2:
The system performs self-adjustment by automatically measuring sample intensity, comparing it to standard intensities, and adjusting the sample flow rate through the syringe pump without external intervention. This closed-loop control enables the system to maintain optimal analysis conditions autonomously, improving both efficiency and accuracy.
2Measurement precision
If manual dilution methods are used to adjust sample intensity, then sample intensity can be matched to standards, but sample waste increases
Solution Approach 1:
The automated syringe pump system replaces manual dilution procedures, enabling precise control of sample flow rate without the need for physical dilution steps. This eliminates the waste associated with adding diluents and performing multiple manual transfer operations, while maintaining accurate intensity matching through electronic flow rate adjustment.
Solution Approach 2:
Instead of changing sample concentration through physical dilution, the system changes the flow rate parameter of the sample introduction. This allows the same sample to be analyzed at different effective concentrations by adjusting how much sample reaches the plasma per unit time, thereby eliminating sample waste while maintaining measurement accuracy.
3Measurement precision
If automatic flow rate control is implemented, then analysis accuracy is improved, but device complexity increases
Solution Approach 1:
The controller serves multiple functions: it controls the syringe pump flow rate, receives intensity data from the ICP-MS or ICP-AES system, compares sample intensities to standards, and automatically adjusts flow rate parameters. By consolidating these functions into a single control unit, the system achieves improved accuracy without proportionally increasing overall system complexity.
Solution Approach 2:
The system implements a feedback loop where the controller continuously monitors sample intensity measurements and automatically adjusts the syringe pump flow rate to maintain optimal analysis conditions. This closed-loop control improves measurement precision while using a relatively simple control architecture that leverages standard feedback control principles.
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 solution enhances the accuracy and precision of ICP spectrometry analysis by maintaining consistent sample intensities, reducing errors associated with intensity differences, and minimizing sample waste by automatically adjusting flow rates in real-time, ensuring reliable isotopic ratio measurements.
Implementation Method 1
a syringe pump operably coupled to a desolvation unit
Implementation Method 2
a desolvation unit coupled to a sample analyzer
Implementation Method 3
Inductively Coupled Plasma (ICP) spectrometry is an analysis technique commonly used for the determination of trace element concentrations
Implementation Method 4
the high temperature causes sample atoms to become ionized or emit light
Implementation Method 5
ICP-AES, or the like) for analysis
Implementation Method 6
adjust one or more control parameters of the syringe pump when the intensity of the one or more analytes exceeds the threshold difference to control a flow rate of the sample solution
Data Source
AI summary
A system embodiment includes, but is not limited to, a syringe pump operably coupled to a desolvation unit, the desolvation unit coupled to a sample analyzer configured to measure an intensity of one or more analytes in a sample solution provided through operation of the syringe pump; and a controller operably coupled to the syringe pump, the controller configured to receive the intensity of the one or more analytes measured by the sample analyzer, determine whether the intensity exceeds a threshold difference of an intensity of at least one standard measured by the sample analyzer, and adjust one or more control parameters of the syringe pump when the intensity of the one or more analytes exceeds the threshold difference to control a flow rate of the sample solution introduced to the sample analyzer.