Enhanced Sampling Device for SPME Fiber Analysis
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Solution Overview
Problem
The Solid Phase Microextraction (SPME) method faces challenges with slow analyte diffusion and absorption onto the sampling fiber, leading to long sampling times and non-linear responses, which complicates quantitative analysis and introduces variables like temperature and contamination risks.
Innovation Solution
An enhanced sampling device (ESD) with a tubular main body that directs analyte flow coaxially over the SPME fiber, reducing sampling time by over 50% and allowing precise measurement of flow rate and time, thereby improving linearity and quantitation without agitation or heat addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional SPME diffusion method is used, then analytes can be concentrated on the fiber, but sampling time is long and response is non-linear
Solution Approach 1:
The patent employs a pump to create controlled gas flow that transports analytes directly to the fiber surface, replacing passive diffusion with active pneumatic transport. This hydraulic/pneumatic system enables rapid analyte delivery and precise flow rate measurement, achieving both fast sampling and accurate quantitation.
Solution Approach 2:
The patent introduces a gas flow dimension to the traditional diffusion process. Instead of relying solely on molecular diffusion through the sample matrix, analytes are carried by gas flow in a new dimensional pathway directly to the fiber, dramatically reducing sampling time while maintaining linearity.
2Reliability
If traditional SPME diffusion method is used, then analytes can be absorbed on the fiber, but sampling process introduces temperature variables and contamination risks
Solution Approach 1:
The patent extracts the harmful elements (temperature control requirements and contamination sources) from the sampling process. By using controlled gas flow through a clean sampling chamber, the method eliminates the need for heated sampling environments and minimizes contamination pathways, improving reliability.
Solution Approach 2:
The patent creates a controlled, clean gas flow environment that acts as an inert sampling atmosphere. The pumped gas flow isolates the fiber and sampling chamber from external contamination sources, providing a cleaner sampling environment that reduces contamination risks.
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
The ESD enables rapid and efficient analyte capture, reducing sampling time and improving linearity, allowing for accurate quantitation of analytes per volume of gas, enhancing the SPME process for laboratory analysis.
Implementation Method 1
The fiber acts as a sponge which captures and concentrates the analytes
Implementation Method 2
The fiber can then be inserted into the heated injector of a GC where the analytes may be thermally desorbed from the fiber
Data Source
AI summary
The present invention is directed to an enhanced sampling device, herein referred to as an ESD, for enhancing the collection efficiency of the SPME method by enhancing the flow of the analytes onto the sampling fiber. The ESD includes a tubular main body, used for a sampling shroud, which directs a flow of analytes to contact the fiber during collection. One end of the main body is open and faces the sample, allowing analytes to flow into the ESD and contact the fiber. A second piece of tubing branches from the other end of the main body and becomes an outlet port, possibly leading to a pump. The ESD permits more rapid transport and absorption of the analytes to the fiber for collection.