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Emission-based detectors for capillary gas chromatography

A gas chromatography and detector technology, applied in the field of emission-based detectors, can solve the problems of increasing system cost and bulky mass spectrometry instruments

Active Publication Date: 2022-04-19
MECANIQUE ANALYTIQUE INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, investing in mass spec instrumentation can add significantly to the cost of the system
Mass spec instruments can also be bulky and require qualified personnel for operation and maintenance

Method used

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  • Emission-based detectors for capillary gas chromatography
  • Emission-based detectors for capillary gas chromatography
  • Emission-based detectors for capillary gas chromatography

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Embodiment Construction

[0031] According to one aspect, an emission-based detector is provided for the analysis of gas samples. Such emission-based detectors can be particularly useful in chromatography (also known as capillary chromatography) applications utilizing capillary-type columns, and can also be used for in-line measurements involving small sample volumes or other applications.

[0032] Chromatography is the field of technology in which the components of a gas sample are separated so that they can be analyzed individually and sequentially. Thus, in some embodiments, the emission-based detector described herein may be used to detect and analyze the components of the gas sample output by the column. Typically, the gas stream output by the column comprises one or more impurities or substances to be detected by the carrier gas, different substances as impurities "peaks" are output at different times. The substance to be detected may be, for example, hydrogen (H 2 ), argon (Ar), oxygen (O2), methane...

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Abstract

An emission based detector is provided for use with capillary chromatography or other applications involving gas samples with small volumes. The detector is based on light emission from the plasma medium. Optical boxes or other detection and / or processing devices may be provided to receive and analyze the emitted radiation and thereby obtain information about the gas to be analyzed. The emission-based detector includes a gas inlet, a gas outlet, and a capillary channel in fluid communication with the gas inlet and the gas outlet. The capillary channel serves as the plasma chamber. Preferably, the capillary channel has lateral dimensions of the same order as the cross-section of a typical chromatography capillary column and defines a labyrinth within the detection region. Also provided is a multi-unit emission-based detector and method of analyzing a gas sample using a plurality of detection units.

Description

Technical field [0001] The art broadly relates to detectors for gas chromatography or similar applications, and more particularly to emission-based detectors, which are suitable for use with capillary-sized columns. Background [0002] In a gas chromatography (GC) system utilizing capillary columns, the volume of the sample to be output is very small when compared to the gas flow coming out of a typical encapsulation column. Capillary columns typically have an inner diameter ranging from 0.12 to 0.5 mm, and therefore have a small cross-sectional area. In such cases, the internal volume of the detector used to analyze the sample can become a problem. Because conventional detectors are designed to handle much larger volumes, samples from capillary columns tend to be diluted in large spaces within the detector, reducing system sensitivity. In addition, the large internal space of the detector acts as a "buffer" or "reservoir", which results in a lower flow rate of the sample, so th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/62G01N21/67
CPCG01N30/64G01N30/6095G01N21/67G01N30/74G01N2030/025
Inventor Y.加马什
Owner MECANIQUE ANALYTIQUE INC