1、 Introduction to HL800 Secondary Thermal Desorption Instrument
HL-800 type secondary thermal desorption apparatusIt is a utility model product that is completely independently innovated and designed. It belongs to a specialized equipment for indoor air quality testing that is compatible with laboratory gas chromatographs. It can be used in conjunction with any general-purpose gas chromatograph with an injector on the left side.
The instrument can use activated carbon adsorption tubes to collect air, and throughSecondary thermal desorptionCompared with the direct injection method, benzene in the air can be accurately and conveniently analyzed. Tenax adsorption tubes can also be used to collect air through a single thermal desorption orSecondary thermal desorptionThe direct injection method is very convenient and accurate for analyzing TVOC (C6~C16) in the air, and more comprehensively and reasonably meets the analysis problems of benzene and TVOC in the air required by national standards GB11737, GB50325, and GB/T18883. It is not only easy to operate and has high component separation, but also greatly improves the sensitivity and quantitative analysis accuracy of the method.
This device can also be equipped with a gas chromatograph to determine volatile harmful substances in the workplace air and non methane total hydrocarbons in the ambient air according to national occupational health standards. It can also be used for the analysis of trace volatile organic compounds in other solids, liquids, and gases.
2、 Instrument features:
1.HL-800 Secondary Thermal Desorption InstrumentIt can meet the thermal desorption/desorption standards such as GB11737-1989 Hygienic Inspection Standards for Benzene, Toluene, and Xylene in Residential Areas, GB/T18883-2002 Indoor Air Quality Standards, HJ583-2010 Solid Adsorption/Thermal Desorption Gas Chromatography, and GB50325-2010 Code for Indoor Environmental Pollution Control of Civil Building Engineering.
2. Activated carbon secondary thermal desorption method can be used to analyze benzene derivatives, or Tenax tube secondary thermal desorption method (or primary thermal desorption method) can be used to accurately analyze TVOC in the air, with a recovery rate of over 99% for analyzing benzene;
3. It can be connected to any gas chromatograph with a vaporization chamber on the left side of the instrument;
4. High repeatability of quantitative analysis with a relative standard deviation of less than 3%;
5. The detection sensitivity of the method for analyzing benzene can be increased by 100-1000 times;
6. All pipelines and valves are temperature controlled and heated, with no residual condensation loss in the sample. The cold trap adopts semiconductor refrigeration and air cooling, with a small volume and good cooling effect.
7. Easy to operate, graphite sealed collection and adsorption tube, stable and leak free thermal desorption process, high work efficiency.
2、 Main technical performance
1. Temperature control
① Primary pyrolysis furnace: room temperature~400 ℃± 1 ℃, temperature control accuracy: ± 0.1 ℃
② Secondary pyrolysis furnace: room temperature~400 ℃± 1 ℃, temperature control accuracy: ± 0.1 ℃
③ Switching valve: room temperature~200 ℃± 1 ℃, temperature control accuracy: ± 0.1 ℃
④ Refrigerator: -20 ℃ to+10 ℃± 1 ℃, temperature control accuracy: ± 0.1 ℃
⑤ Output pipeline: Room temperature~250 ℃, temperature control accuracy: ± 0.1 ℃
2. Carrier gas control
① Analyzing the carrier gas path, when using a large-diameter capillary column, the flow rate adjustment range is 3-10ml/min, and when using a packed column, it can reach 60ml/min;
② A carrier gas path for thermal desorption and refrigeration concentration adsorption, with a flow regulation range of 50-100ml/min.
3. Sample tube specifications: U-shaped tube (optional fillers include Tenax TA, activated carbon, composite, etc.)
4. Recovery rate:>99% (activated carbon desorption of benzene)
5.RSD：＜ 3%
6. Linear:> 99.9%
7. Power: ＜ 500W
8. Size: 40 * 32 * 50cm (L * W * H)
9. Weight: 21kg
Guiding Technical Articles
[1] Zhang Tianlong, Shi Jin, Qi Xiaohua Experimental study on the application of secondary thermal desorption technology to analyze TVOC [C]. Cross Strait Conference on Analytical Chemistry two thousand and six
[2] Zhang Tianlong, Qi Xiaohua, Shi Jin Rapid and accurate analysis of benzene derivatives in air using activated carbon tube secondary thermal desorption direct injection method [C]. Chemshow. cn. 2006
[3] State Environmental Protection Administration Monitoring and Analysis Methods for Air and Waste Gas [M]. China Environmental Science Press, two thousand and three
[4] Xu Bohong, Yan Huifang Monitoring Methods for Hazardous Substances in the Workplace [M]. China People's Public Security University Press, 2003
