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Discharge ionization current detector

An ionization current and current detection technology, applied in the direction of measuring current/voltage, instruments, measuring devices, etc., can solve the problems of low minimum detection amount, low ionization efficiency, low dynamic range, etc., to improve the detection limit, suppress the baseline current, less variable effect

Active Publication Date: 2013-11-20
SHIMADZU SEISAKUSHO CO LTD
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AI Technical Summary

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 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

[0030] 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.

[0031] 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 the outer wall surface of the cylindrical tube 2 is surrounded by metal ( Ring-shaped plasma generation electrodes 4 , 5 , 6 made of, for example, SUS or copper. 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 cylindric...

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Abstract

A low-OH-content quartz glass having an OH content of 5 ppm or less is used as a cylindrical tube (2) for covering the surface of metal plasma-generating electrodes (4, 5, 6) in order to cause low-frequency barrier discharging. In low-frequency barrier discharging, hydrogen and oxygen from the OH included in a dielectric are released into the plasma over a prolonged period, and this was found to be the main cause of an increase in the baseline electric current. However, using a low-OH-content quartz glass allows the baseline electric current to be dramatically lowered, whereby the S / N ratio and detection limit can be improved.

Description

technical field [0001] 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 a low-frequency barrier discharge. Background technique [0002] 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 thermionic detectors (FTDs). 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 gas and measures the ion current, and realizes a large dynamic range of about 6 bits. 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 efficien...

Claims

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Application Information

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IPC IPC(8): G01N27/68G01N27/70G01N30/64G01R19/00
CPCG01R19/0061G01N27/626G01N30/64G01N27/62G01N27/70
Inventor 品田惠堀池重吉西本尚弘
Owner SHIMADZU SEISAKUSHO CO LTD
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