A method and device for detecting trace compounds
A compound and trace technology, applied in the field of analytical instruments, can solve the problems of limited ion mobility spectrum resolution, complex instrument structure, and reduced collision frequency, achieving high time resolution, high resolution, and elimination of false peaks
Inactive Publication Date: 2018-10-09
TARIM UNIV
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The structure of these instruments has become very complicated, the volume is also large, and the instrument is expensive
At the same time, because the collision frequency between ions and neutral gas molecules is greatly reduced under low pressure, the resolution of ion mobility spectrum is very limited. For example, the resolution of ion mobility spectrum at low pressure under uniform electric field is usually lower than 60, while the Spectral resolution is usually below 40
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0053] The structure of the ion mobility spectrometer used in this embodiment is as follows figure 1 As shown, the ion mobility spectrometer works at atmospheric pressure, and the ion source is 63 Ni radiation ionization source, the temperature of ion mobility spectrometry is 150oC, the migration gas is nitrogen, and the flow rate is 900mL.min -1 , The total length of the transfer tube is 12.8 cm, separated into two regions by a B-N ion gate, the front end is the ionization region, the length is 2.8 cm, and the rear end is the migration region, the length is 10.2 cm. A Faraday disk detector is connected after the migration zone.
[0054] The present invention can greatly improve the performance of the ion mobility spectrometer system, such as a traditional ion mobility spectrometer in the ion mobility spectrogram of 50ms, in order to achieve a good separation effect, the opening time of the ion gate is 0.25ms, then the utilization efficiency of ions is :
[0055] 0.25 / 50 = ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method and an apparatus for detecting trace compounds. The method comprises the following steps: step I, ionizing a sample; step II, performing the square wave frequency signal modulation with a duty ratio of 50 percent on a continuous ion flow; step III, enabling the ion flow subjected to the treatment of step II to enter a migration apparatus for performing ion migration separation; and step IV, rebuilding an ion mobility spectrum by using chirp Z transformation. The method is high in sensitivity, the utilization rate of ions can be increased to 50 percent, and the sensitivity is increased by 3 to 10 times compared with that by the traditional method; and compared with the traditional Fourier transform, the sensitivity can be increased by 1 to 2 times. Compared with the conventional method, common phenomena such as tailing peaks, leading peaks and the like can be eliminated, so that the resolution can be improved, and the spectrogram identification and quantification effect can be improved.
Description
technical field [0001] The invention relates to the technical field of analytical instruments, in particular to a method and device for detecting trace compounds. Background technique [0002] Ion Mobility Spectrometry (IMS) technology is a new type of rapid separation and detection technology that appeared in the 1970s. Since the separation can be carried out under atmospheric pressure without vacuum, it has the characteristics of simple structure, high sensitivity, fast analysis speed and reliable results compared with traditional mass spectrometers. At the same time, the separation speed of ion mobility spectrometry is very fast. Usually, an analysis can be completed within tens of milliseconds, and the analysis results can be given within a few seconds to tens of seconds. It can detect trace chemical substances in the atmospheric environment. Especially suitable for on-site use. At present, ion mobility spectrometry has been widely used in airports, stations and other ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/62
CPCG01N27/622
Inventor 刘文杰孟庆艳沈红玲贾旭浦云峰王志雁郭建恒
Owner TARIM UNIV