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of five parts: a sampling system, a gas chromatograph
Time：
2023-04-07 14:22
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Portable Gas Chromatograph Mass Spectrometer 1. Working Principle: This instrument utilizes two technologies, gas chromatography and mass spectrometry, to separate, identify, and measure volatile organic compounds (VOCs) in samples. The sample enters the gas chromatography system from the sampling port, and the gas chromatograph performs time separation of the sample compounds (the residence time separation order is mainly based on the increasing boiling point of the compound). It is then bombarded by high-energy electrons (70eV) to form ion fragments, and the airflow is introduced into the mass spectrometer,
The mass spectrometer detects and identifies elutriated compounds based on the principle of four rods, and then compares them with the spectral library to identify compounds. 2、 The instrument consists of five parts: a sampling system, a gas chromatograph, a mass spectrometer, a vacuum system, and a data processing system.
Sampling system: There are three forms: probe, headspace sampling device, and purge and capture device. The instrument can only automatically recognize one connected sampling device at a time. Gas chromatograph: Using high-purity nitrogen gas from a built-in ammonia gas bottle as the carrier gas, passing through a 15m long, 0.25 mm inner diameter, and 0.1 film thickness μ The chromatographic column of m narrow hole fused silica tube transports the analyte, and then enters the detector.
The inner wall of the chromatographic column is coated with a layer of polymethyl siloxane stationary phase, with a temperature range of 45-220 ° C. Mass spectrometer: includes ionization, mass selector, and ion detector. Air system: it is provided by non evaporative getter pump and small sputter ion pump. The non evaporative getter pump is equipped with special zirconium alloy, which can absorb gas molecules very effectively when heated. The non evaporative getter pump is effective for extracting active gas, but it cannot extract inert gas. The sputtering ion pump is used to remove gases such as argon, neon, and krypton, in order to prevent these gases from accumulating in the mass spectrometer and causing pressure rise and interference with its operation. The data processing system consists of control and analysis software. 3、 Operation
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hole fused silica tube transports the analyte, and then enters the detector.
increasing boiling point of the compound). It is then bombarded by high-energy electrons (70eV) to form ion fragments, and the airflow is introduced into the mass spectrometer,
through a 15m long, 0.25 mm inner diameter, and 0.1 film
increasing boiling point of the compound). It is then bombarded by high-energy electrons (70eV) to form ion fragments, and the airflow is introduced into the mass spectrometer,
of five parts: a sampling system, a gas chromatograph
increasing boiling point of the compound). It is then bombarded by high-energy electrons (70eV) to form ion fragments, and the airflow is introduced into the mass spectrometer,
chromatograph, a mass spectrometer, a vacuum system, and a data
increasing boiling point of the compound). It is then bombarded by high-energy electrons (70eV) to form ion fragments, and the airflow is introduced into the mass spectrometer,
the principle of four rods, and then compares them
increasing boiling point of the compound). It is then bombarded by high-energy electrons (70eV) to form ion fragments, and the airflow is introduced into the mass spectrometer,
The mass spectrometer detects and identifies elutriated compounds based
increasing boiling point of the compound). It is then bombarded by high-energy electrons (70eV) to form ion fragments, and the airflow is introduced into the mass spectrometer,
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