Multiple Loop Sample Introduction for ICP Spectrometry
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Solution Overview
Problem
Conventional automated sample introduction systems for inductively coupled plasma spectrometry can only process one liquid sample at a time, limiting the overall throughput and requiring sequential operation and rinsing, which increases analysis time.
Innovation Solution
A multiple loop sample introduction system with a valve assembly that allows simultaneous handling of two sample loops, enabling concurrent withdrawal and introduction of samples into a nebulizer, reducing the need for extensive rinsing and sample volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional automated sample introduction system processes one sample at a time, then the system structure remains simple, but the sampling throughput is limited
Solution Approach 1:
The system divides the sample introduction function into multiple independent sample loops (first sample loop, second sample loop, etc.), each capable of holding and introducing a sample independently. This segmentation allows parallel processing of multiple samples without requiring a completely new system architecture, thus increasing throughput while maintaining manageable complexity
Solution Approach 2:
The valve assembly is designed with multi-functionality to control multiple sample loops using a unified control mechanism. The same valve assembly can route different samples from different loops to the nebulizer, allowing one component to serve multiple functions and reducing overall system complexity despite handling multiple samples
2Loss of time
If sequential sample processing is used, then the system operation is simple, but the analysis time increases
Solution Approach 1:
The system enables continuous introduction of samples by having multiple sample loops ready to be introduced in parallel or rapid succession. While one sample is being introduced, another can be prepared in a different loop, eliminating idle time and ensuring continuous useful action at the nebulizer, thus reducing total analysis time
Solution Approach 2:
Multiple samples are pre-loaded into separate sample loops before analysis begins. This preliminary preparation allows the system to immediately start introducing samples without sequential loading delays, reducing analysis time while the automated valve control maintains operational simplicity
3Loss of substance
If extensive rinsing is performed between samples, then cross-contamination is minimized, but the sample volume required increases
Solution Approach 1:
The system extracts the rinsing function from the main sample introduction path by providing separate rinsing pathways for each sample loop. This allows targeted rinsing of only the specific loop that needs cleaning, rather than rinsing the entire system, thus reducing sample volume consumption while maintaining cross-contamination control
Solution Approach 2:
Each sample loop is equipped with its own localized rinsing capability through the valve assembly. This local quality approach allows rinsing to be applied precisely where needed (in the specific loop that handled the previous sample) rather than throughout the entire system, minimizing sample volume loss while ensuring cross-contamination control at each loop
Data Source
AI summary
A multiple loop sample introduction system comprises a valve assembly including a sample collection valve and a sample introduction valve. First and second sample loops are in fluid communication with the sample collection valve and the sample introduction valve to receive aliquots of liquid samples to be introduced into a nebulizer. The valve assembly is operable to port a first aliquot into the first sample loop, while porting a second aliquot received in the second sample loop for introduction into the nebulizer.