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Chemical substance detector and method for detecting chemical substance

A chemical substance and detection device technology, applied in the field of chemical substance detection, can solve the problems of complex pretreatment and reduced versatility, and achieve the effects of improving detection sensitivity, easy operation, and shortening measurement time.

Inactive Publication Date: 2005-06-01
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the measurement of dioxins, although there is a known measurement method using GC / MS (Gas Chromatography / Mass Spectrometer) with high decomposition ability, this method requires complicated pretreatment, and currently it is from sampling to judgment takes weeks
Therefore, in other furnaces, the index substance of the above furnace may not be optimal, and if only one precursor can be measured, the versatility will be reduced.

Method used

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  • Chemical substance detector and method for detecting chemical substance
  • Chemical substance detector and method for detecting chemical substance
  • Chemical substance detector and method for detecting chemical substance

Examples

Experimental program
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Effect test

Embodiment approach 1

[0064] figure 1 It is an explanatory diagram showing a detection device of a chemical substance according to Embodiment 1 of the present invention. This chemical substance detection device 100 includes an ionization chamber 1, a gas introduction device 2, a vacuum ultraviolet lamp 3 as an ionization means, and a time-of-flight mass spectrometer 4 as a mass analysis means. The ionization chamber 1 is provided with an RF ion trapping device 10 including an RF (Radio Frequency: high frequency) ring as an ion trapping mechanism. Here, the chemical substance to be detected in the ionized exhaust gas is confined in the trap 11 by the high-frequency electric field formed inside.

[0065] Mechanisms that confine ions inside by electric, magnetic, or other electromagnetic forces may be used. In addition, an electric field, a magnetic field, etc. may be used individually, or may be used in combination suitably. Several types of such ion trapping mechanisms are known, and among them, ...

Embodiment approach 2

[0082] The chemical substance detection device 100 of the present invention directly irradiates the exhaust gas introduced into the trap 11 with vacuum ultraviolet light to ionize the substance to be measured. Then, SWIFT and TICKLE are applied here to fragment the ions of the measurement target substance. Therefore, under the same conditions as the ionization before this case, SWIFT or fragmentation may not always be successful. Therefore, the conditions for SWIFT and TICKLE are explained here. image 3 is an explanatory diagram showing ion signal intensity distribution with respect to RF voltage when the trap frequency is kept constant. in addition, Figure 4 It is an explanatory diagram showing the ion signal intensity distribution with respect to the RF frequency when the RF voltage is kept constant.

[0083] Ionization in combination with other than the vacuum ultraviolet light used in this case is to ionize the chemical substance to be detected outside the trap 11 . ...

Embodiment approach 3

[0088] In the case of SWIFT, it is necessary to improve the capture efficiency of the measurement target substance as a high-quality hydrophilic molecule. On the other hand, in the case of TICKLE, it is necessary to improve the capture efficiency of the fragmented measurement target substance having a low mass number. Therefore, during SWIFT, the energy value (that is, the product of RF voltage and RF frequency) applied to the RF loop 14 is increased. Also, at TICKLE, the product of RF voltage and RF frequency is reduced. In this way, the capture efficiency of the measurement target substance or its fragments can be improved during SWIFT and TICKLE.

[0089] For example, keep the RF frequency constant at 1MHz, capture at 1600V for SWIFT, and capture at 1000V for TICKLE. In addition, it is also possible to keep the RF voltage constant at 1600V, capture at RF frequency 1.4MHz for SWIFT, and capture at 1.0MHz for TICKLE. Additionally, both RF frequency and RF voltage can be va...

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Abstract

The invented detecting device (100) for chemical matter is equipped with a vacuum UV lamp (3), which is used to ionize the to-be-detected target chemical matter in the exhaust Gs. The ionized to-be-detected target chemical matter is isolated by an ion capture device (10) with high frequency electric field formed therein. The ion group in the ion capture device (10) is provided with energy by SWIFT waveform (which comprises frequency component excluding the frequency corresponding to the orbit resonance frequency of the to-be-detected target chemical matter ion) and impurities are removed. Furthermore, the above-mentioned ion group is provided with energy by TICKLE waveform (which comprises frequency component corresponding to the orbit resonance frequency of the to-be-detected target chemical matter ion) and the to-be-detected target chemical matter ion is segmented. Therefore, the mass of the segment is determined by a mass analyzer (4) to identify the to-be-detected target chemical matter.

Description

technical field [0001] The present invention relates to a detection device for a chemical substance and a method for measuring the concentration of a chemical substance, in particular to a chemical substance for detecting a very small amount of dioxins or their precursors contained in the exhaust gas of a waste incineration facility with high accuracy The detection device and the detection method of chemical substances. Background technique [0002] In recent years, in order to reduce the dioxins contained in the exhaust gas discharged from the waste incineration facilities, the real-time measurement of the dioxins or their precursors contained in the exhaust gas, and the test for the combustion control of the incinerator are being studied among. For the measurement of dioxins, although there is a known measurement method by GC / MS (Gas Chromatography / Mass Spectrometer) with high decomposition ability, this method requires complicated pretreatment, and currently it is from s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64H01J49/16H01J49/26
CPCH01J49/427H01J49/162H01J49/424
Inventor 山越英男二见博团野实鹤我薰典栗林志头真
Owner MITSUBISHI HEAVY IND LTD
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