Piggy-back portable on-line analysis time-of-flight mass spectrometer

A technology of time-of-flight mass spectrometry and mass spectrometer is applied in the field of new devices for online rapid analysis of volatile organic compounds, which can solve the problems of overlapping peaks in the spectrum and slow spectrum analysis, and achieve the effect of simple spectrum.

Active Publication Date: 2013-02-20
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The microsecond analysis time of time-of-flight mass spectrometry can ensure that the spectrum can be obtained in a short time, but the electron energy of the commonly used electron impact ionization source is 70eV, and the obtained spectrum has many fragments due to the collision of high-energy electrons. When the sample matrix is ​​complex, There are many overlapping peaks in the spectrum, and the spectrum analysis is slow

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  • Piggy-back portable on-line analysis time-of-flight mass spectrometer
  • Piggy-back portable on-line analysis time-of-flight mass spectrometer

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Embodiment Construction

[0027] The invention discloses a shoulder-back time-of-flight mass spectrometer for on-line detection of volatile organic compounds. The vacuum system, control system and power supply system in the mass spectrometer are all placed on the back of the shoulder, and the time-of-flight analyzer is placed on the scanning handle Among them, the ionization source and sampling system are placed at the front end of the probe. The sampling system adopts a tubular dense polydimethylsiloxane membrane. The membrane sampling does not require sample pretreatment. The liquid or gas sample flows through the tubular membrane through the circulating pump, and the sample can penetrate through the membrane and enter the ionization system directly. The system uses a vacuum ultraviolet lamp as a soft ionization source, and the spectrum obtained only has molecular ion peaks, which is convenient for online rapid analysis.

[0028] The present invention designs a shoulder-back mass spectrometer, which ...

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Abstract

The invention discloses a piggy-back volatile organic compound on-line detection time-of-flight mass spectrometer. A vacuum system, a control system and a power system in the mass spectrometer are all arranged on the shoulder portion, a time-of-flight analyzer is arranged in a scanning handle, and an ionization source and a sampling system are arranged at the front end of a probe. A sample feeding system adopts a tubular dense polydimethylsiloxane membrane, no sample pretreatment is needed in membrane sample feeding, liquid or gas samples flow through the tubular membrane through a circulating pump, and samples can penetrate through the membrane to enter an ionization system directly. A vacuum ultraviolet lamp is used as a soft ionization source, and an obtained spectrogram only has molecular ion peaks so as to facilitate on-line rapid analysis.

Description

technical field [0001] The invention belongs to analytical instruments, in particular to a new device for fast online analysis of volatile organic compounds, Background technique [0002] Gas chromatography (GC) is the most important method for the analysis of volatile organic compounds (VOCs) in the laboratory. The analysis method based on GC has become the national standard and the standard analysis method of the US Environmental Protection Agency (EPA). For on-site analysis, EPA recommends a batch of GC-based detection instruments, such as Voyager, a portable gas chromatograph detector of PE Company in the United States, and a portable gas chromatograph detector (Scentograph Plus II) produced by Sentex Systems, Inc. in the United States. However, using GC, it is still difficult to control the analysis time of complex samples within 10 minutes, and the analytical columns required for various pollutants are also different, so this method has great limitations in the applica...

Claims

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Application Information

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IPC IPC(8): H01J49/40H01J49/02
Inventor 侯可勇陈文东崔华鹏花磊其他发明人请求不公开姓名
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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