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  • Determination of volatile organic compounds in waste gas from stationary pollution sources by solid phase adsorption thermal desorption / gas chromatography mass spectrometry

    The volatile organic compounds (VOCs) in the waste gas of fixed pollution source were collected directly by adsorption tube filled with suitable adsorbent (or firstly collected by air bag and then collected into solid adsorption tube). The adsorption tube was placed in the thermal desorption instrument for secondary thermal desorption. The desorption gas was separated by gas chromatography and detected by mass spectrometry. Qualitative analysis was performed according to retention time, mass spectrum or characteristic ions Standard method or external standard method for quantitative analysis. The specific surface area of carbox / Carbopack was 35g / g

    2020-08-07 Practical thermal analysis fifty-one

  • Determination of benzene homologues in ambient air by solid adsorption / thermal desorption gas chromatography

    Determination of benzene homologues in ambient air by solid adsorption / thermal desorption instrument - gas chromatography method principle: the sample tube filled with poly (2,6-diphenyl-p-phenylether) (Tenax) was used to enrich benzene series in ambient air or indoor air at room temperature. The sampling tube was connected to a thermal desorption instrument, and the adsorbed components were introduced to a gas chromatograph with a hydrogen flame ionization detector (FID) for analysis. Instrument and equipment gas chromatograph: equipped with FID detector. Capillary column: PEG-20M, 30m × 0.32mm × 1.00um or equivalent capillary column

    2020-08-07 Practical thermal analysis thirty-five

  • Determination of volatile organic compounds by adsorption tube sampling thermal desorption gas chromatography mass spectrometry

    Methods principle the technical specification for manual monitoring of ambient air quality uses solid adsorbent to enrich volatile organic compounds in the ambient air. The adsorption tube is placed in a thermal desorption instrument, separated by gas chromatography, and detected by mass spectrometry. The internal standard method and external standard method were used for qualitative and quantitative comparison. Adsorption tube: stainless steel or glass, with inner diameter of 6mm, filled with carbon pack C, carbon pack B and carbon box 1000, with length of 13, 25 and 13 mm respectively. Or use another with the same function

    2020-08-07 Practical thermal analysis forty-eight

  • Determination of total volatile organic compounds (TVOC), benzene and styrene in toner by thermal desorption gas chromatography

    Total volatile organic compounds (TVOC) in toner The principle of gas chromatography is that the sample is heated directly to the gas trap to determine the volatile organic matter. Desorption tube: stainless steel or glass material desorption tube, PTFE pipe matched with desorption tube, desilicated glass wool. Adsorbent: Tenax TA or other equivalent

    2020-08-03 Practical thermal analysis thirty-five

  • Determination of vinyl chloride in air by gas chromatography

    Principle vinyl chloride in air was collected by activated carbon tube, and then injected after thermal desorption. After separation by dinonyl phthalate column, it was detected by flame ionization detector. The retention time was qualitative and the peak height was quantitative. Activated carbon tube: a 250mm long glass tube with an inner diameter of 3.5-4.0 mm and an outer diameter of about 6 mm is used to put 100 mg of 20-40 mesh coconut shell activated carbon, and both ends are fixed with a small amount of glass wool. The activated carbon should be treated with nitrogen at 300 ~ 350 ℃ for 3 ~ 4H before pipe installation. After the pipe is installed, the pipe is blown with nitrogen at the same temperature for 2 ~ 3 min. It can not be treated before pipe installation, and nitrogen can be used after pipe installation

    2020-07-27 Practical thermal analysis thirty-six

  • Application of air absorption pyrolysis instrument for acrylonitrile

    Principle acrylonitrile in air is collected in silica gel sampling tube at room temperature. After thermal desorption, it is separated by GDX-102 column and detected by hydrogen flame ionization detector. The retention time is qualitative and the peak height is quantified. Silica gel sampling tube: a glass tube with a length of 15cm, an inner diameter of 3.5-4.0mm and an outer diameter of about 6mm. It contains 200mg silica gel with 40-60 mesh. Both ends are fixed with glass wool and sealed with plastic caps. This tube can be used in a short time. Sampling pump, 0 ~ 1L / min. Syringe, 100ml, 1ml. Micro syringe, 1 pl. Thermal desorption unit: main unit of thermal desorption unit

    2020-07-27 Practical thermal analysis thirty-five

  • Determination of styrene in air by thermal desorption

    Principle styrene in the air is adsorbed in the activated carbon tube, and the sample is injected after thermal desorption. After separation by polyethylene glycol 6000 column, it is detected by ammonia flame ionization detector. The retention time is qualitative and the peak height is quantitative. Instrument activated carbon tube: a glass tube with a length of 150 mm, an inner diameter of 3.5-4.0 mm, and an outer diameter of about 6 mm, is filled with 100 mg of 20-40 mesh coconut shell activated carbon. Both ends are fixed with a small amount of glass wool. This tube can be used in a short time. It can also be used for long-term storage. The activated carbon should be filled with nitrogen at 300 ~ 350 ℃ before piping

    2020-07-27 Practical thermal analysis twenty-three

  • Determination of toluene in air by thermal desorption analyzer

    Toluene in the air was collected with activated carbon, and the sample was injected after thermal desorption. After separation by polyethylene glycol 6000 column, it was detected by flame ionization detector. The retention time was used for qualitative analysis and peak height was used for quantification. Instrument activated carbon tube: a 150 mm long glass tube with an inner diameter of 3.5-4.0 mm and an outer diameter of about 6 mm is used to put 100 mg of 20-40 mesh coconut shell activated carbon. Both ends of the tube are fixed with a small amount of glass wool. This tube can be used in a short time. It can also be filled with 250mm long glass tube with the same inner diameter, which can be used for long-term preservation. Before installing the tube, the activated carbon should be placed at 30

    2020-07-23 Practical thermal analysis thirty-eight