Inline Dual-Stage Sample Dilution for High-Factor ICP Analysis
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Solution Overview
Problem
Achieving accurate and precise high dilution factors for trace elemental analysis in ICP spectrometry is challenging due to limitations in existing pump resolution and manual techniques, which can lead to sample saturation and instrumentation damage.
Innovation Solution
A system utilizing multiple independent pumps and a valve system under computer control for dynamic adjustment of dilution factors, enabling single-stage and dual-stage inline dilution of samples, allowing for precise control of carrier and diluent flows to achieve dilution factors of 10,000 times or greater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual dilution techniques are used, then operation simplicity is maintained, but measurement precision and manufacturing precision deteriorate due to inability to achieve accurate high dilution factors
Solution Approach 1:
The dilution process is divided into multiple discrete stages, each controlled by individual pumps and valves. The system segments the fluid handling into distinct functional modules (sample introduction, diluent addition, mixing, and delivery) that can be independently controlled to achieve precise cumulative dilution factors
Solution Approach 2:
The system employs dynamically adjustable pump speeds and valve positions controlled by a computer system. The dilution factors can be changed on-the-fly by adjusting flow rates in real-time, allowing the system to adapt to different analytical requirements without physical reconfiguration
2Manufacturing precision
If existing pump resolution is used, then device complexity is minimized, but manufacturing precision deteriorates due to limitations in achieving high dilution factors
Solution Approach 1:
A computer control system acts as an intermediary between the user and the physical pump/valve mechanisms. The software calculates precise flow rates and timing sequences, translating high-level dilution factor specifications into low-level motor control signals that drive the pumps and valves with sub-microliter precision
Solution Approach 2:
The system replaces manual mechanical dilution operations with automated electronic control. Instead of physically adjusting pump mechanisms by hand, the system uses computer-controlled motors and solenoids to precisely regulate fluid flow, eliminating human error and achieving repeatable precision
3Object-affected harmful factors
If samples are introduced without dilution, then analysis speed is maintained, but object-affected harmful factors increase due to sample saturation and instrumentation damage
Solution Approach 1:
The system performs dilution actions before sample introduction to the analytical instrument. By pre-diluting samples to appropriate concentration ranges, the system prevents saturation of detectors and damage to sensitive instrumentation components while maintaining continuous flow for efficient analysis
Data Source
AI summary
Sample preparation systems and methods are described having pump control, valve configurations, and control logic that facilitate automatic, inline preparation dilutions of a sample according to at least two dilution operating modes. A system embodiment includes, but is not limited to a first pump configured to drive a carrier fluid; a second pump configured to drive a diluent; and a plurality of selection valves fluidically coupled with the first pump and the second pump, the plurality of selection valves being configured to direct fluid flows from the first pump and the second pump according to at least two modes of operation to provide a single-stage sample dilution according to a first operating mode and to provide a dual-stage sample dilution according to a second operating mode.