Gas Chromatography Liner with Active Material for Matrix Separation
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Solution Overview
Problem
Existing sample preparation methods for gas chromatography are complex and require extensive sample preparation, leading to difficulties in removing interfering matrices and achieving accurate analytical results.
Innovation Solution
A device with a controllably heated tubular liner, active material, and a split outlet system that allows for controlled carrier gas flow in two directions, enabling slow sample evaporation and separation of volatile and high-boiling substances, while retaining the sample matrix in the active material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sample preparation methods are used, then sample can be introduced into gas chromatograph, but extensive sample preparation is required and interfering matrices are difficult to remove
Solution Approach 1:
The patent extracts and removes interfering matrix components from the sample using an active material (adsorbent) in the liner. The active material selectively adsorbs unwanted substances while allowing volatile analytes to pass through, thereby purifying the sample without requiring complex preparation procedures.
Solution Approach 2:
The patent utilizes changes in temperature parameters to control the evaporation and adsorption processes. By heating the sample reservoir and controlling the temperature in the liner, the system enables selective vaporization of volatile components and their subsequent separation from non-volatile matrix materials.
2Productivity
If complex valve constructions are used, then sample can be prepared and introduced, but online analysis becomes difficult and procedure becomes complex
Solution Approach 1:
The system performs sample preparation automatically as the sample is introduced into the liner. The active material continuously adsorbs and retains interfering substances while allowing volatile analytes to pass through to the chromatograph, eliminating the need for complex manual preparation steps and valves.
Solution Approach 2:
The liner with active material performs preliminary purification of the sample automatically during the introduction process. Interfering matrix components are trapped in the active material before the volatile analytes reach the gas chromatograph, enabling direct online analysis without complex pre-treatment procedures.
3Measurement precision
If extensive sample preparation is performed, then interfering matrices can be removed, but analysis time increases and efficiency decreases
Solution Approach 1:
The active material in the liner continuously extracts and removes interfering matrix components from the sample stream as it passes through. This continuous extraction occurs automatically during sample introduction, eliminating the need for separate, time-consuming preparation steps.
Solution Approach 2:
The system maintains continuous useful action by constantly facilitating the passage of volatile analytes through the active material while simultaneously retaining interfering substances. This continuous process occurs during the entire sample introduction period, eliminating idle preparation time.
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 method simplifies sample preparation, improves analytical accuracy by focusing volatile and high-boiling substances, and allows for online analysis without the need for extensive sample preparation or complex valve constructions.
Implementation Method 1
flowing the carrier gas flow comprising the sample vapour through an active material comprised in a container placed in an outer tube, the active material selected in such a way that the sample remains in the active material and the remaining gas flow passes through the active material
Implementation Method 2
generating a gas flow comprising a gaseous sample by evaporation of a sample and generating a carrier gas flow containing the sample vapour
Implementation Method 3
a sampling chamber, a tubular liner (16) inside the sampling chamber and adapted to be heated by a heating coil (42)
Data Source
AI summary
An apparatus (10) for preparing samples (62) for gas chromatography contains a tubular liner (16) which can be flooded with carrier gas (64) and has a lower end region which can be heated in a controlled manner; a sample reservoir (26) which can be heated in a controlled manner; an active material (20) provided in the lower end region of the liner (16); an outer tube (38) which is arranged coaxially around the liner, wherein a cavity (46) which is connected to the lower end region of the liner is formed between the liner and the outer tube; a splitter exit (48) on the outer tube (38); a carrier gas connection (52) which is provided on the outer tube (38) and is intended to supply carrier gas (82) to the cavity (46); a column connection (22) which is provided above the active material (20) and is intended to connect a gas chromatography column (12); and control means for controlling the carrier gas stream, in a first setting (FIG. 1), from the interior (24) of the liner (16) through the active material (20) into the cavity (46) and from there to the splitter exit (48) and, in a second setting (FIG. 2), from the carrier gas connection (52) in the opposite direction through the cavity (46) and through the active material (20) to the column connection (22).