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Method for identifying and detecting halogenated hydrocarbons

A technology for compounds and halogenated hydrocarbons, applied in the field of analysis of halogenated hydrocarbon compounds, can solve the problems of difficult separation and detection of compounds, and achieve the effect of real-time online analysis, small instrument size and high sensitivity

Inactive Publication Date: 2010-05-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mobility of halogenated hydrocarbons is relatively close to that of reagent ion peaks, and most of the migration spectra of halogenated hydrocarbons only show the migration spectrum peaks of halogen ions, so it is difficult to obtain good results for various compounds. separation and detection

Method used

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  • Method for identifying and detecting halogenated hydrocarbons
  • Method for identifying and detecting halogenated hydrocarbons
  • Method for identifying and detecting halogenated hydrocarbons

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Embodiment 1

[0037] figure 2 The detection spectra of TCE in positive and negative ion modes are given. In the figure, RIP represents the reagent ion peak, here CO 3 - (H 2 O) n . It can be seen from the figure that TCE can be well detected in both positive and negative ion modes. In the positive ion mode, it has four characteristic peaks, and its migration time is 18.49ms, 19.69ms, 20.63ms and 23.33ms respectively. In the negative ion mode, it has Cl - In addition to the characteristic peak (18.61ms), it also has its own characteristic peak with a migration time of 22.50ms, so it can be well separated from the reagent ion peak.

Embodiment 2

[0039] image 3 is given by CCl 4 Detection spectra in negative ion mode. It can be seen from the figure that CCl 4 With Cl in negative ion mode - The characteristic peak (18.69ms). Due to CCl 4 The ionization energy of the ionization energy is greater than that of ultraviolet light, and it cannot be ionized in the positive ion mode, and its spectrum cannot be obtained. In this way, it can be distinguished from the TCE, and at the same time, its interference to the detection of the TCE can be eliminated.

Embodiment 3

[0041] The experimental conditions are the same as those mentioned above Figure 2-3 The experimental conditions used in the experimental spectrum are the same; in the experiment, it is measured that the detection limit of the ultraviolet photoionization source ion mobility spectrum to carbon tetrachloride is 4.3 × 10 -9 g, the detection limit of tetrachlorethylene is 5.0×10 -11 g, thus it can be seen that the ionization energy of carbon tetrachloride and tetrachlorethylene is 11.47eV and 9.326eV, the former is higher than the ionization energy (10.6eV) of ultraviolet light, and the latter is lower than the ionization energy of ultraviolet light, so four Chlorinated carbon cannot undergo photoionization, but tetrachlorethylene can undergo photoionization to generate a large number of electrons, thereby greatly improving the detection sensitivity of ion mobility spectrometry.

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Abstract

The invention relates to a method for identifying and detecting halogenated hydrocarbons, which is characterized by using vacuum ultraviolet as the ionization source of ion mobility spectrometry, adopting the mode of positive-negative ion switching, adopting the principle of photo ionization in the positive ion mode and adopting the principle of photo-electric reflection in the negative ion mode. Being used for detecting halogenated hydrocarbons, the method can widen the type of the compounds measured by the ion mobility spectrometry, greatly improve the capabilities of the ion mobility spectrometry in rapidly identifying and analyzing the samples and simultaneously improve the sensitivity of the ion mobility spectrometry to the compounds with ionization energy lower than that of the vacuum ultraviolet in the negative ion mode.

Description

technical field [0001] The invention belongs to the analysis of halogenated hydrocarbon compounds, and in particular relates to a new method for identifying and detecting halogenated hydrocarbon compounds. This method can broaden the types of compounds measured by ion mobility spectrometry and greatly improve the The ability to quickly identify and analyze samples, while improving the sensitivity of ion mobility spectrometry. Background technique [0002] Haloalkane compounds, such as carbon tetrachloride, trichlorethylene and tetrachloroethylene, are common volatile organic pollutants in the urban atmosphere, and are also the objects of research by many scholars. They are mainly emitted from human activities, as industrial raw materials, solvents, extractants and cleaning agents, etc., and have a wide range of emission sources in cities. For example, trichloroethylene (Trichloroethylene, abbreviated as TCE) is an excellent solvent and a substitute for benzene and gasoline....

Claims

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Application Information

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IPC IPC(8): G01N27/64
Inventor 李海洋董璨何川先
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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