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A discharge ionization current detector

A technology of ionization current and detector, applied in the direction of measuring current/voltage, instruments, measuring devices, etc., can solve the problems of low dynamic range, low ionization efficiency, low minimum detection amount, etc.

Active Publication Date: 2016-06-08
SHIMADZU SEISAKUSHO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, FID has the following disadvantages: (1) Due to the low ionization efficiency, a sufficiently low minimum detection amount cannot be obtained; (2) The ionization efficiency for alcohols, aromatics, and chlorine-based substances is low; (3) Due to the need for Hydrogen gas is highly dangerous, so special equipment such as explosion-proof equipment is required, and handling is also troublesome
However, despite this, the dynamic range of the PDD is not as good as that of the FID, in fact, it is more than 1 bit lower than the dynamic range of the FID

Method used

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Embodiment Construction

[0031] refer to figure 1 A discharge ionization current detector according to an embodiment of the present invention will be described. figure 1 It is a schematic configuration diagram of the discharge ionization current detector of this embodiment.

[0032] In the discharge ionization current detector of this embodiment, the inside of the cylindrical tube 2 made of a dielectric becomes the first gas flow path 3, and metal ( For example, ring-shaped plasma generation electrodes 4, 5, 6 made of SUS, copper, etc.). Since the wall surface of the cylindrical tube 2 exists between the electrodes 4, 5, 6 for plasma generation and the first gas flow path 3, the wall surface itself of the dielectric serves as the surface covering the electrodes 4, 5, 6 for plasma generation. The dielectric coating layer functions to perform dielectric barrier discharge. A gas supply pipe 7 is connected to the upper end of the cylindrical tube 2 , and a plasma gas serving also as a dilution gas fl...

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Abstract

The invention relates to a discharge ionization current detector. A low-OH-content quartz glass with an OH content equal to or lower than 5 ppm is used as a cylindrical tube (2) covering the surface of metallic plasma generation electrodes (4, 5 and 6) for generating a low-frequency barrier discharge. In the low-frequency barrier discharge, hydrogen and oxygen originating from the OH contained in a dielectric material are released into plasma gas for a long period of time, constituting a primary cause of an increase in the baseline current. The use of a low-OH-content quartz glass dramatically lowers the baseline current, thereby improving the S / N ratio and the detection limit.

Description

[0001] This application is a divisional application of an application with a filing date of May 31, 2012, an application number of 201280011760.1 (international application number PCT / JP2012 / 064045), and an invention title of "discharge ionization current detector". technical field [0002] The present invention mainly relates to a discharge ionization current detector suitable as a detector for a gas chromatograph (GC). More specifically, it relates to a discharge ionization current detector using low-frequency barrier discharge. Background technique [0003] As detectors for GC, thermal conductivity detectors (TCD), electron capture detectors (ECD), hydrogen flame ionization detectors (FID), flame photometric detectors (FPD), flame Various types of detectors such as a thermionic detector (FTD). The most common of these detectors, especially for the detection of organics, is the FID. FID is a detector that uses a hydrogen flame to ionize the sample components in the sample...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/70G01N30/64G01R19/00
CPCG01N27/70G01N30/64G01R19/0061G01N27/62
Inventor 品田惠堀池重吉西本尚弘
Owner SHIMADZU SEISAKUSHO LTD
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