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Method for sensitively detecting alkane, alkene and halogenated alkane

A technology of halogenated alkanes and alkenes, which is applied in the field of highly sensitive detection of alkanes, alkenes and halogenated alkanes, can solve the problems of serious influence of water vapor detection results, low proton affinity, low alkalinity, etc., and achieve real-time online analysis, water vapor content The effect of small requirements and small size of the instrument

Inactive Publication Date: 2012-07-04
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Description
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  • Application Information

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Problems solved by technology

However, due to the low chemical activity of alkanes (low proton affinity and low alkalinity), the sensitivity of traditional ion mobility spectrometry for the detection of alkanes is relatively low, and water vapor has a serious impact on the detection results, which limits the use of ion mobility spectrometry in the measurement of alkanes. Applications

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  • Method for sensitively detecting alkane, alkene and halogenated alkane
  • Method for sensitively detecting alkane, alkene and halogenated alkane
  • Method for sensitively detecting alkane, alkene and halogenated alkane

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Embodiment 1

[0035] image 3 The detection spectra of n-pentane, n-hexane, n-heptane and n-octane in positive ion detection mode of glow discharge ion mobility spectrometry under atmospheric pressure are given. It can be seen from the figure that the migration times of n-pentane, n-hexane, n-heptane and n-octane are 22.81ms and 25.50ms, 23.68ms and 26.06ms, 24.29ms, 24.76ms and 27.15ms, 25.33ms and 26.11ms respectively. ms and 28.36ms. Therefore, glow discharge source ion mobility spectrometry at atmospheric pressure can detect and distinguish these four alkanes well.

Embodiment 2

[0037] Figure 4 Shown is the detection spectrum of cyclohexane and isooctane under the positive ion detection mode of glow discharge ion mobility spectrometry under atmospheric pressure. RIP in the figure represents the air peak when no sample is injected. It can be seen from the figure that the migration times of cyclohexane and isooctane are 25.05ms and 26.31ms, 24.95ms and 27.56ms, respectively. This shows that this new detection method can also detect naphthenes and isoparaffins well.

Embodiment 3

[0039] Figure 5 Shown is the detection spectrum of octene in positive ion detection mode of glow discharge ion mobility spectrometry at atmospheric pressure. It can be seen from the figure that octene has two ion peaks with migration times of 22.88ms and 24.47ms, respectively. This shows that this new detection method can also detect alkenes well.

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Abstract

The invention discloses a new method for detecting alkane, alkene and halogenated alkane. The method takes the glow discharge under the atmosphere as an ionization source of ion mobility spectrometry,a glow-discharge ion mobility spectrometry is formed under the atmosphere, and the mixed gases of air, nitrogen and oxygen, helium gas containing nitrogen oxide gas, neon, argon gas and krypton gas are taken as the discharging carrier gas. The method is used for detecting alkane, alkene and halogenated alkane, the detection speed is high, the sensitivity is high, the requirement to the water vapor content in the detection atmosphere is low, and the real-time on-line monitoring can be realized; and when the vapor concentration in the airflow is 790 ppb, the detection limit of the method to thenormal pentane can reach 10 ppb.

Description

technical field [0001] The present invention relates to the analysis method of hydrocarbon compounds, specifically a new highly sensitive method for detecting alkanes, alkenes and halogenated alkanes. This method has fast detection speed and high sensitivity, and requires little water vapor content in the detection atmosphere. Real-time online monitoring can be realized. When the water vapor concentration in the gas stream is 790pp, the detection limit of this method can reach 10ppb for n-pentane. Background technique [0002] Alkanes, alkenes and halogenated alkanes are closely related to people's life and are harmful gases to the environment and industry. Hydrocarbons in the environment and the atmosphere mainly come from refinery exhaust gas, evaporation from automobile fuel tanks, industrial production and stationary combustion pollution sources, etc. A more significant source is vehicle exhaust, which contains considerable amounts of unburned hydrocarbons. Most of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/70
Inventor 李海洋董璨
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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