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  • Perfect analysis of 16 kinds of TVOC in the new national standard (GB 50325-2020) - the solution of Deyan automatic thermal desorption instrument

    In order to meet the "GB 50325-2020 standard for indoor environmental pollution control of civil building engineering", steadfast Deyan provides the following solutions, which fully meet the requirements of 16 kinds of TVOC injection detection. The national standard GB 50325-2020 (standard for indoor environmental pollution control of civil construction engineering) will be implemented on August 1, 2020, and the original GB 50325-2010 will be abolished. The standard for the control and monitoring of total volatile organic compounds (TVOC) has been revised as follows: 1

    2020-07-08 Practical thermal analysis one thousand two hundred and twenty

  • On the promotion and promotion of thermal analyzers in GB 50325-2020

    Dear users: with the gradual decline of the epidemic situation, most enterprises have begun to return to work. As a high-quality service provider, steadfast Deyan will certainly move forward with enterprises and provide better solutions for thermal analyzer users. Thank you for your trust and support to Beijing steadfast Deyan Instrument Co., Ltd. On August 1, the state will implement the new standard GB 50325-2020. In order to ensure the user's use effect and the attitude of being responsible for the user, our company provides the upgrading and maintenance service for the ex factory thermal analyzer to ensure that the instrument is in the

    2020-06-15 Practical thermal analysis two hundred and fifty-nine

  • 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. Adsorbents: Tenax gr (specific surface area: 35m? 2G), carbo pack B (specific surface area: 100M? / g), carbon pack C (specific surface area: specific surface area: 35m? 2 / g)

    2020-08-07 Practical thermal analysis fifty-two

  • 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-eight

  • 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. Compared with the standard mass spectrogram of the target to be determined and the retention time, the qualitative analysis was carried out, and the external standard method or internal standard method was used for quantitative analysis. 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 thermal desorption 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-seven

  • Determination of acrylonitrile in air application of thermal desorption instrument

    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