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Method for recognizing and analyzing sample and ion transfer spectrometer

The technology of ion mobility spectrometer and ion transfer tube is applied in the field of ionization mode and detection mode of ion mobility spectrometer, which can solve problems such as difference between positive and negative ion mobility spectrum, and achieve the effect of improving analysis and identification ability.

Inactive Publication Date: 2009-04-22
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

For the same ionization source, the obtained positive and negative ion mobility spectra are also very different.

Method used

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  • Method for recognizing and analyzing sample and ion transfer spectrometer
  • Method for recognizing and analyzing sample and ion transfer spectrometer
  • Method for recognizing and analyzing sample and ion transfer spectrometer

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Embodiment 1

[0029] Figure 4 Given is that methanol is radioactive 63 The combination of Ni ionization source and VUV photoionization source, the mobility spectrum in positive ion detection mode. It has no response in VUV photoionization mode, positive ion detection mode, but in 63 There is a response in Ni ionization mode and positive ion detection mode, and a characteristic peak appears at the position of migration time 27.83ms. In this way, substances such as methanol are radioactive 63 Whether it can respond under Ni ionization mode and VUV photoionization mode, as well as the difference in response intensity and position, provide more information for ion mobility spectrometry to identify samples, and at the same time 63 The Ni ionization method makes up for the shortcoming that methanol cannot be ionized in the VUV photoionization mode, and broadens the types of compounds measured by ion mobility spectrometry.

Embodiment 2

[0031] Figure 5 Given are dibromomethane and carbon tetrachloride in the radioactive 63 Ni ionization, mobility spectrum in negative ion detection mode, Figure 6 Shown are the migration spectra of dibromomethane and carbon tetrachloride under VUV photoionization and positive ion detection mode. It can be seen from the figure that the migration times of methylene bromide and carbon tetrachloride in the negative ion detection mode are very close (21.31ms and 21.28ms), and it is difficult to distinguish them, but their responses under the VUV photoionization and positive ion detection modes are very similar. Not the same, dibromomethane has a strong response at the position with a migration time of 21.75ms, while CC14 has basically no response. Therefore, the difference in the response of substances in positive and negative ion detection modes can provide more information for ion mobility spectrometers to identify samples, and the application of positive and negative ion mode...

Embodiment 3

[0033] Figure 7 Shown is the migration spectrum of butanone under VUV photoionization and discharge ionization, positive ion detection mode. It can be seen from the figure that butanone has two characteristic peaks in the discharge ionization mode, and the response time is 23.58ms and 24.36ms respectively, and there is a characteristic peak in the VUV photoionization mode, and the response time is 22.43ms. Therefore, the difference in response time and response intensity of substances under the two ionization modes of VUV photoionization and discharge ionization can provide more information for ion mobility spectrometry to identify samples.

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Abstract

The invention provides a method used for identifying and analyzing samples. The sample is ionized by two or three combination types out of the following types: photoionization VUV, radioactive <63>Ni ionization, point discharge ionization and electron spray ionization. Subsequently, the detection in a positive ion mode and the detection in a negative ion mode are carried out at the same time, thus obtaining positive / negative ion signal spectrogram; the obtained ion signals are respectively amplified by a micro-current amplifier and subsequently collected by a multi-passage data collecting card; the data is analyzed by a computer so as to obtain the type and the consistency of the sample to be tested. The method has the advantages that according to type difference of compounds measured by ion mobility spectrometry under different ionization sources and different detection modes, the types of the compounds measured by the ion mobility spectrometry is enlarged; meanwhile, according to the difference between the characteristic of the spectrogram and the spectrogram, the sample is analyzed and identified, thus improving the analysis and identification capability of the ion mobility spectrometry on the sample; meanwhile, the advantages the ion mobility spectrometer is small and portable can be kept.

Description

technical field [0001] The invention belongs to the analysis instrument ion mobility spectrometer, and specifically relates to the ionization mode and detection mode of the ion mobility spectrometer. By using this method, the types of compounds measured by the ion mobility spectrometer can be broadened, and at the same time, the sensitivity of the ion mobility spectrometer to the sample can be greatly improved. Rapid identification and analysis capabilities. Background technique [0002] Ion Mobility Spectrometry (IMS) technology is an analysis and detection technology that appeared in the 1970s and was applied to on-site analysis and detection in the 1980s. Ionization forms ions, and the resulting ions move under the force of an applied electric field. In the range of weak electric field (less than 1000V / cm), the speed of ion movement is proportional to the electric field strength, v=KE, where v is the speed of ions, E is the electric field strength, K is the ion mobility,...

Claims

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Application Information

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IPC IPC(8): G01N27/64
Inventor 李海洋董璨王海龙李京华刘广生何川先
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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