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Method for realizing efficient detection of formaldehyde with assistance of reagent ions

An ion-assisted, formaldehyde technology, applied in measuring devices, particle separation tubes, instruments, etc., can solve the problems of many interfered substances, not suitable for rapid detection, etc., and achieve the effect of rapid and highly sensitive detection

Pending Publication Date: 2022-05-27
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

At present, methods for formaldehyde detection include chromatography and sensor methods, among which chromatography usually requires derivatization, extraction, etc.

Method used

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  • Method for realizing efficient detection of formaldehyde with assistance of reagent ions
  • Method for realizing efficient detection of formaldehyde with assistance of reagent ions
  • Method for realizing efficient detection of formaldehyde with assistance of reagent ions

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Embodiment Construction

[0029] like figure 1 As shown in the figure, a device and method for realizing efficient detection of formaldehyde assisted by reagent ions includes a reaction gas sampling system 1 and an ionization source 2. First, the dibromomethane reagent is carried to the ionization source by means of carrier gas carrying, and the reagent is carried to the ionization source. Molecules are ionized under the action of photons emitted by VUV to generate reagent ions. The reagent ions then react with the sample molecules entering through the sampling pipeline to form a characteristic ion in which one of the bromine atoms is replaced by a formaldehyde molecule. The isotope abundance ratio of 79 Br: 81 Br=1:1, the characteristic ion can be accurately identified, thereby increasing the qualitative accuracy. figure 2 Formaldehyde mass spectrum of photoionization and dibromomethane reagent ion-assisted ionization. It can be seen that under photoionization conditions, formaldehyde cannot be det...

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Abstract

The invention discloses a device and a method for realizing efficient detection of formaldehyde with the assistance of reagent ions. A photo ionization time-of-flight mass spectrometry is used as a detector, a carrier gas carries dibromomethane reagent molecules to enter an ionization source, the reagent molecules are ionized under the action of photons to generate reagent ions, the reagent ions and sample molecules entering through a sample introduction pipeline are subjected to a molecular ion reaction, and the dibromomethane is obtained. According to the method, formaldehyde molecules are used as a template, so that a characteristic ion with one bromine atom substituted by the formaldehyde molecules is formed, and the characteristic ion can be accurately identified according to the isotope abundance ratio of bromine, 79Br: 81Br = 1: 1, so that the qualitative accuracy is improved. In addition, the method does not need sample pretreatment, a spectrogram can be obtained within 10 seconds, and rapid and high-sensitivity detection of formaldehyde is realized.

Description

technical field [0001] The invention relates to a mass analysis instrument, in particular to a device for realizing efficient detection and detection of formaldehyde assisted by reagent ions. Background technique [0002] Formaldehyde is the simplest aldehyde in molecular structure and is carcinogenic and mutagenic. Long-term exposure to excessive formaldehyde will reduce the body's respiratory function, the information integration function of the nervous system, and affect the body's immune response, and has toxic effects on the cardiovascular system, endocrine system, digestive system, and reproductive system. Formaldehyde can also react with ionic chlorides in the air to form dichloromethyl ether. In urban areas, the photolysis of formaldehyde is one of the most important sources to maintain photochemical ozone to form free radicals, which also makes formaldehyde one of the important indicators of atmospheric photochemical activity. At present, the methods of formaldehy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64H01J49/00
CPCG01N27/64H01J49/0031Y02A50/20
Inventor 李海洋万宁波花磊蒋吉春陈平吴称心
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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