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A kind of non-fragmentation mass spectrometric detection method of glyoxal and/or methylglyoxal

A technology of methylglyoxal and a detection method, which is applied to measurement devices, instruments, scientific instruments, etc., can solve the problems of low reaction efficiency, increased detection time, poor detection sensitivity, etc., and achieves the effect of high-efficiency ionization

Active Publication Date: 2020-04-07
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

People also tried CH 3 COO - , I(H 2 O) n - However, the reaction efficiency of these ions with glyoxal or methylglyoxal is low, and the detection sensitivity is poor, so it is difficult to be used for mass spectrometry detection of glyoxal and methylglyoxal in the atmosphere
In summary, the existing mass spectrometric ionization methods are difficult to effectively ionize glyoxal and methylglyoxal, or generate a large number of fragment ions when ionizing glyoxal and methylglyoxal
The existing mass spectrometry detection methods all need to add a chromatographic device before the mass spectrometer to effectively detect glyoxal and methylglyoxal, but the chromatography greatly increases the time required for detection, and cannot realize real-time detection of gas concentration
In conclusion, there is no reported example of rapid and non-fragmentation detection of glyoxal and methylglyoxal directly by mass spectrometry

Method used

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  • A kind of non-fragmentation mass spectrometric detection method of glyoxal and/or methylglyoxal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment is the application of glyoxal and methylglyoxal in mass spectrometry, which is completed in a time-of-flight mass spectrometry device equipped with pulsed laser sputtering and flow reaction tubes. The specific steps are as follows:

[0031] (1) Using Nd 3+ : Double frequency 532nm pulsed laser (10Hz) of YAG laser, focused on the helically moving metal target aluminum to generate charged species;

[0032](2) The charged species produced by aluminum is carried by the high-purity (99.999%) helium gas controlled by the first pulse valve. In a 60mm flow reaction tube;

[0033] (3) Utilize the second pulse valve to pass glyoxal or methylglyoxal gas into the flow reaction tube respectively, and the instantaneous pressure of glyoxal or methylglyoxal gas entering the flow reaction tube is about 0.01~1Pa, at this time, the instantaneous total air pressure (T=298K) in the flow reaction tube is about 100Pa;

[0034] (4) After reacting in the flow reaction tube, i...

Embodiment 2

[0037] This embodiment is the application of glyoxal and methylglyoxal in mass spectrometry, which is completed in a time-of-flight mass spectrometry device equipped with pulsed laser sputtering and flow reaction tubes. The specific steps are as follows:

[0038] (1) Using Nd 3+ : Double frequency 532nm pulsed laser (10Hz) of YAG laser, focused on the helical metal target vanadium to generate charged species;

[0039] (2) The charged species produced by vanadium are carried by the high-purity (99.999%) helium gas controlled by the first pulse valve, and after being cooled by a thin tube with a diameter of 2 mm and a length of 25 mm, it enters the tube with an inner diameter of 6 mm and a length of In a 60mm flow reaction tube;

[0040] (3) Use the second pulse valve to pass glyoxal or methylglyoxal gas into the flow reaction tube respectively, and the instantaneous pressure of glyoxal or methylglyoxal gas entering the flow reaction tube is about 0.01 ~1Pa, at this time the i...

Embodiment 3

[0044] This embodiment is the application of glyoxal and methylglyoxal in mass spectrometry, which is completed in a time-of-flight mass spectrometry device equipped with pulsed laser sputtering and flow reaction tubes. The specific steps are as follows:

[0045] (1) Using Nd 3+ : Double frequency 532nm pulsed laser light (10Hz) of YAG laser, focused on the metal target iron of helical motion to generate charged species;

[0046] (2) The charged species produced by iron is carried by the high-purity (99.999%) helium gas controlled by the first pulse valve. In a 60mm flow reaction tube;

[0047] (3) Use the second pulse valve to pass glyoxal or methylglyoxal gas into the flow reaction tube respectively, and the instantaneous pressure of glyoxal or methylglyoxal gas entering the flow reaction tube is about 0.01 ~1Pa, at this time the instantaneous total air pressure (T=298K) in the flow reaction tube is about 100Pa;

[0048] (4) After reacting in the flow reaction tube, ioniz...

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Abstract

The invention discloses a no-fragmentation mass-spectrometry detection method of glyoxal and / or methyl glyoxal and belongs to the technical field of analysis methods of the glyoxal and / or methyl glyoxal. According to the method, a charged species with appropriate chemical activity is selected to be in collision reaction with the glyoxal and / or methyl glyoxal, the glyoxal and / or methyl glyoxal canbe efficiently ionized, the condition that no fragmentation o fthe glyoxal and / or methyl glyoxal can be guaranteed, and unique product ions with the same molecular weight as that of the glyoxal and / ormethyl glyoxal are directly formed. The detection method can be used for detecting the glyoxal and / or methyl glyoxal and can also be used for detecting whether the atmosphere contains the glyoxal and / or methyl glyoxal or not.

Description

technical field [0001] The invention relates to the technical field of analysis methods for glyoxal and / or methylglyoxal, in particular to a non-fragmentation mass spectrometry detection method for glyoxal and / or methylglyoxal. Background technique [0002] Glyoxal (CHOCHO) and methylglyoxal (CH 3 COCHO) is an important active precursor of free radicals in atmospheric oxygenated volatile organic compounds (OVOCs). It has a wide range of sources and plays an important role in the generation of atmospheric oxygen free radicals. The accurate detection of glyoxal and methylglyoxal is of great significance to the study of the causes of air secondary pollution and the scientific formulation of prevention and control measures. [0003] Due to the high chemical activity of glyoxal and methylglyoxal and the characteristics of easy breaking of carbon-carbon bonds, the ionization of the two has been facing great challenges. In mass spectrometry detection, the interaction between cha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62
CPCG01N27/628
Inventor 何圣贵刘清宇张婷卢雪伟
Owner INST OF CHEM CHINESE ACAD OF SCI
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