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Sampling device used for analyzing polyaromatic hydrocarbon samples at real time in on-line mass spectrum

A real-time analysis and sampling device technology, applied in the field of time-of-flight mass spectrometry, can solve the problems of low saturated vapor pressure, sample gas condensation, serious memory effect, etc., and achieve stable temperature control, accurate quantification, and broad application prospects

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

[0008] The saturated vapor pressure of these high-boiling semi-volatile organic compounds is extremely low at room temperature. For the real-time monitoring of PAHs in high-temperature atmospheres in the actual waste resource utilization and the detection of ppm-level PAHs gas samples, TOF-MS routine The sampling method makes the sample gas easy to condense on the inner wall of the sampling pipeline, and the memory effect is serious

Method used

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  • Sampling device used for analyzing polyaromatic hydrocarbon samples at real time in on-line mass spectrum
  • Sampling device used for analyzing polyaromatic hydrocarbon samples at real time in on-line mass spectrum
  • Sampling device used for analyzing polyaromatic hydrocarbon samples at real time in on-line mass spectrum

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Embodiment 1

[0037] For the examination of the quantitative performance of the sampling device of the present invention, a pyrene sample is used to configure sample gases with different concentrations for detection. When configuring the sample gas, first use n-hexane as a solvent to dissolve a certain amount of pyrene sample, and then use high-purity nitrogen as a carrier gas to prepare 10ppm, 5ppm, 2.5ppm, and 1.25ppm sample gases at a high temperature of 200°C. During sampling, the flow rate of the sample gas is 200ml / min, and the temperature of the sampling pipeline is kept at 200°C. The time-of-flight mass spectrometer adopts vacuum ultraviolet lamp ionization, and the mass spectrometry signal of the obtained pyrene samples at each concentration is between figure 2 given in. image 3 It is the relationship curve between the integrated intensity of the mass spectrum signal peak area and the sample concentration at different concentrations of the pyrene sample, and the R value after fi...

Embodiment 2

[0039] For the examination of the memory effect of the sampling device of the present invention, a trichlorobenzene sample is used to configure a relatively large concentration of sample gas for detection. When configuring the sample gas, put the weighed trichlorobenzene solid sample in a certain amount of high-purity nitrogen gas, and completely volatilize the trichlorobenzene solid sample at a high temperature of 200°C to make a 100ppm sample gas. During sampling, the flow rate of the sample gas is 200ml / min, and the temperature of the sampling pipeline is kept at 200°C. The time-response curve of the obtained trichlorobenzene sample is as follows: Figure 4 As shown, the signal peak area integral of the trichlorobenzene sample gas dropped to a stable background noise level within 50 seconds after the injection was stopped, basically eliminating the memory effect and showing good time response characteristics.

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Abstract

The invention relates to a flight time mass spectrometer, in particular to a sampling device for on-line detection of the flight time mass spectrometer by organic matters, comprising a quartz capillary, a ferrule-type tee pipe coupling and the like; two interfaces of the ferrule-type tee pipe coupling are arranged on the same straight line, wherein the inner wall of one of the interface is provided with a PTFE sleeving in an inserting manner; the inner wall of the other interface is provided with a metallic heat conducting tube in an inserting manner; the quartz capillary is sheathed in the metallic heat conducting tube in a penetrating manner; the two ends of the quartz capillary both stretch out of the metallic heat conducting tube and one end thereof probes into a TFE sleeving; a gap is reserved between the PTFE sleeving and the metallic heat conducting tube on the third interface of the ferrule-type tee pipe coupling; and the electric heating casing is coated on the outer wall of the ferrule-type tee pipe coupling. The invention is combined with the mass spectrometer to detect polyaromatic hydrocarbon gas samples, the response time is within 50s, the samples are quantified accurately and no memory effect exists in the analysis process.

Description

technical field [0001] The invention relates to a time-of-flight mass spectrometer, in particular to a sampling device for an on-line organic detection time-of-flight mass spectrometer. A device for direct sample injection, on-line detection, and real-time analysis of high-boiling gas samples such as polycyclic aromatic hydrocarbons. Background technique [0002] Energy and environmental issues are two severe challenges facing human society today. How to use energy reasonably and effectively and protect the environment is a major topic that countries all over the world are competing to study. The resource utilization of waste is an important measure that can not only alleviate the energy problem, but also effectively reduce environmental pollution, but the secondary pollution of persistent organic pollutants is the primary problem that must be solved in the process of resource utilization of waste. Polycyclic aromatic hydrocarbons (Polycyclic Aromatic Hydrocarbons PAHs) are...

Claims

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Application Information

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IPC IPC(8): G01N27/64H01J49/40
Inventor 李海洋花磊侯可勇吴庆浩
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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