55 results about "Thermal desorption" patented technology

The application provides a simple gate oxide integrity testing device, which comprises a test sample and a test structure; the test sample comprises a substrate, a dielectric layer (gate oxide layer) on the substrate, a gate replacement layer used for replacing a gate layer or being located above the gate layer, so that the test sample forms a three-layer structure comprising the substrate-dielectric layer-gate replacement layer, and the gate oxide integrity of the dielectric layer is tested by combining a thermal desorption technology; the test structure is used for accommodating the test sample, providing a test temperature, and recording released elements; the application also provides a simple gate oxide integrity testing method, which has the technical effects of low cost, simple operation, and rapid feedback of test results, and does not need to prepare a transistor device, adopts the gate replacement layer arranged on the substrate-dielectric layer (gate oxide layer) to combine the thermal desorption technology, and directly tests the stacked layer material contained in a MOS stacked layer structure.

This application relates to the field of trace detection technology, and more specifically, to a method for detecting trace gaseous substances, a thermal desorption pre-concentrator, and its preparation method. The preparation method of the thermal desorption pre-concentrator includes: sequentially cleaning, acid-activating, drying, and cutting a metal foam sheet; immersing a metal foam substrate in an adhesive and then removing it; dispersing a particulate adsorbent phase on the surface of the metal foam substrate; guiding the particulate adsorbent phase into and adhering to the internal pore surface of the metal foam substrate through negative pressure filtration to obtain a metal foam substrate loaded with the particulate adsorbent phase; applying a DC voltage to the metal foam substrate loaded with the particulate adsorbent phase; placing the metal foam adsorbent in a housing with an airflow channel, and electrically connecting the metal foam adsorbent to a conductive electrode. This application is advantageous for achieving rapid and complete desorption of the target analyte, improving pre-concentration efficiency, and increasing detection response speed.

The application discloses a method for analyzing methyl mercury methyl carbon in a complex matrix, which comprises the following steps: taking a methyl mercury-containing sample to be measured, adding sodium tetraphenylborate to perform a phenyl derivatization reaction; performing headspace solid-phase microextraction enrichment on the derivatized sample; introducing the enriched solid-phase microextraction fiber into a gas chromatograph mass spectrometer to perform thermal desorption, separation and detection; and qualitatively or quantitatively analyzing the methyl mercury methyl carbon according to the retention time, mass spectrum response signal and isotope characteristics. The application is aimed at the problems of low methyl mercury content and strong matrix interference in a complex matrix such as a microbial culture system, and combines phenyl derivatization, solid-phase microextraction enrichment and gas chromatograph mass spectrometry detection, so that the enrichment efficiency and detection sensitivity are improved, the matrix interference is reduced, the method has the characteristics of high sensitivity, good matrix adaptability and stable repeatability, and is suitable for trace methyl mercury methyl carbon analysis in a complex culture matrix and isotope characteristic determination of a 13C labeled system.

The application discloses a temperature-programmable temperature-variable pyrolysis sampling ionization system and mass spectrometer, and relates to the field of mass spectrometer. The sampling ionization system comprises a casing, a heating assembly, a cooling structure, a controller and an ionization source. The heating assembly and the cooling structure are installed in the casing, and the heating assembly is configured to form a sampling cavity. The application can quickly cover the melting boiling point of the required detection sample, and stably consider low-melting boiling point and high-melting boiling point samples, so as to ensure the detection precision and detection capacity. When the concentration of the detection sample is relatively high, the temperature of the sampler is set to the highest through program control after the detection is completed, so that the cleaning work of the sampling cavity is performed, and the pollution problem of the next sampling detection is reduced.

The application provides an aerosol thermal desorption ion source, which comprises a flash evaporator for receiving a particle beam transmitted along a first direction and heating and vaporizing particles in the particle beam to generate gas molecules; and a filament for releasing electrons to ionize the gas molecules to generate ions; the flash evaporator has a length along the first direction, a width along a second direction, and a thickness along a third direction; the first direction, the second direction and the third direction intersect each other; in the first direction, a cross section of the flash evaporator perpendicular to the first direction is rectangular; in the second direction, the width of the flash evaporator is smaller than the irradiation range of the filament; and in the third direction, the filament is arranged on both sides of the flash evaporator; by using the device, the shape of the gas flow generated by the flash evaporator can be changed, the coincidence degree of the distribution area of the gas and the transmission area of the directional electron beam is improved, and the ionization efficiency of the gas molecules is improved.

The present application relates to atmospheric pressure ion manipulation technology, specifically, the present application discloses a thermal desorption ionization reaction device, specifically, a thermal desorption ionization reaction device, comprising a stainless steel metal desorption ionization cavity, the metal desorption ionization cavity is a hollow circular cylinder with an open upper end and a closed lower end, an insulating cover for sealing the open upper end is arranged on the open upper end, and a gas and ion outlet is arranged in the middle of the insulating cover; the counter electrode and the electrode with holes are connected to the high-voltage output end of the high-voltage power supply and the ground electrode (or negative electrode) respectively. The voltage applied to the counter electrode and the electrode with holes is alternating current or direct current, and the voltage amplitude is 2000V. The present application improves the consistency and stability of batch production of thermal desorption ionization modules based on integrated design, reduces power consumption and processing cost, and is beneficial to the industrialization of mass spectrometry or ion mobility spectrometry.

This invention discloses a method and system for staged desorption of dioxins from fly ash and co-treatment of flue gas in the field of solid waste treatment technology. The method includes collecting fly ash generated from flue gas treatment from a fly ash silo; subjecting the fly ash to dechlorination and / or catalyst passivation treatment to obtain pretreated fly ash; preheating the pretreated fly ash to obtain preheated fly ash; and performing thermal desorption treatment on the preheated fly ash in an air atmosphere. This invention, by performing dechlorination and / or catalyst passivation treatment on the fly ash, reduces the chlorine source and passivation catalyst. By employing indirect heat exchange for waste heat preheating, it avoids dioxin re-adsorption, effectively inhibits de novo dioxin synthesis, achieves efficient desorption in an air atmosphere, avoids the use of inert gases, significantly reduces the operating cost of flue gas treatment, and effectively realizes the reduction, harmlessness, and resource recovery of fly ash.

The utility model discloses a kind of hot desorption tail gas back burning device, it is related to soil remediation and waste gas processing technical field, including back burning device ontology, the inside of the back burning device ontology is provided with first air mixing section, ignition combustion section and second air mixing section, tail gas inlet is set in the side above the back burning device ontology, fresh air inlet is provided in the other side above the back burning device ontology.The utility model is extracted by hot desorption to organic waste gas and is sent to combustion chamber incineration, so that it does not need to use conventional adsorption, oxidation and so on to process organic pollution waste gas, so as to not produce secondary pollution, and some combustible organic pollutants combustion can produce heat value, which is just available to provide for the contaminated soil to be repaired heating, can reduce the use amount of natural gas or liquefied petroleum gas, more efficient and energy saving.

This invention relates to an additive for thermal desorption of polycyclic aromatic hydrocarbon (PAH) contaminated soil and its preparation method. It utilizes a composite oxide of manganese, rare earth metals, and transition metals to oxidize PAHs into low-carbon molecules during thermal desorption, achieving efficient removal, lowering the thermal desorption temperature, and saving energy consumption. The lower thermal desorption temperature reduces the loss of organic matter in the soil, facilitating the secondary use of the treated soil. The prepared composite oxide has a hollow spherical structure, which promotes sufficient contact and rapid reaction between PAHs and the composite oxide. The doping of transition metal elements into the manganese oxide and cerium oxide lattices creates oxygen vacancy defects, further enhancing the catalytic oxidation performance. Loading the manganese, rare earth metal, and transition metal composite oxide onto the surface of Fe3O4 improves its dispersion. Utilizing the magnetic properties of Fe3O4, the additive can be separated from the soil after desorption treatment, allowing for recycling.

This utility model relates to the field of drilling equipment technology and discloses a drilling device for soil thermal desorption remediation, comprising: a base and a mounting frame, with a tensioning cylinder installed inside. The output end is connected to a guide rod via a guide frame, and a motor is installed at the bottom of the guide rod. A mounting block is coaxially mounted on the motor rotor, with a drill rod and drill bit mounted at its bottom. A fan is located inside the mounting block. A resistance heating element is installed inside the drill rod, and a soil parameter sensor group is mounted on its surface. A temperature regulation module is located on the surface of the sensor group. This device achieves efficient drilling by driving the drill rod and drill bit to rotate with the motor; the resistance heating element inside the drill rod directly heats the soil during drilling, promoting the volatilization of pollutants and improving the efficiency of thermal desorption remediation; the soil parameter sensor group monitors soil parameters in real time, and the temperature regulation module adjusts the heating temperature accordingly to achieve precise temperature control and ensure the remediation effect; the fan accelerates the diffusion and discharge of volatilized pollutants. This effectively improves the efficiency and quality of soil thermal desorption remediation.

The application discloses a lanthanum-doped cerium phosphotungstate porous soil thermal desorption catalyst and a preparation method and application thereof, and the catalyst takes cerium phosphotungstate as an active component and takes lanthanum trioxide as a cocatalyst; the mass percentage of the cocatalyst is 2-4% based on the mass of the active component. The catalyst synthesized by the method has the advantages of low light-off temperature and high catalytic efficiency, and can realize the goal of low-energy-consumption repair of organic pollutant soil.

The application discloses a kind of thermal desorption treatment contaminated soil thermal conductivity test system and test method, test system includes test cavity, heating furnace, gas pressure control system and soil sample thermal conductivity test system, gas pressure control system includes gas pressure sensor, gas pressure control valve, nitrogen source, tail gas processor and vacuum pump, soil sample thermal conductivity test system includes double probe, wire, direct current power supply, multichannel temperature recorder and thermal conductivity calculation system, the double probe insertion to be measured soil sample and place in test cavity, the application can operate under high temperature environment, simultaneously, two different test methods are used to calculate two thermal conductivities for the same to-be-tested soil sample respectively, and the mean value is obtained by comparison and verification, effectively save the time of parallel test under high temperature environment, reduce the experimental error of calculating thermal conductivity.

The utility model belongs to waste gas treatment technical field, concretely relates to an improved waste gas treatment system and thermal desorption appearance. Waste gas treatment system includes: on -line adsorption unit, including the adsorption tube filled with adsorbent, the front exhaust pipe is connected with the on -line adsorption unit and experimental instrument exhaust outlet, the back exhaust port is arranged in the gas outlet end of on -line adsorption unit, heating device makes adsorbent desorption regeneration, combustion chamber makes waste gas conversion into harmless substance, the front exhaust pipe, adsorption tube, back exhaust port cooperate and form the emission passage of experimental instrument's operation waste gas, and the packing area of adsorbent constitutes the necessary place of emission passage. The waste gas harmless treatment system proposed in the scheme is connected directly with thermal desorption instrument through the front exhaust pipe, and the entity structure occupies small space, can move synchronously with thermal desorption instrument, can carry out adsorption to the waste gas discharged in the instrument operation process under the closed condition, avoids the harm of direct discharge of waste gas to human body and environment.

The utility model provides a kind of composite thermal desorption air sampling tube in occupational health field, belong to occupational health technical field, including pipe body, the inside of pipe body is equipped with multiple solid adsorbents from inlet end to outlet end in turn, the multiple solid adsorbents include first graphitized carbon adsorbent layer, second graphitized carbon adsorbent layer, third graphitized carbon adsorbent layer and carbon molecular sieve adsorbent;And sealing cap, the sealing cap is sealed and is arranged in the both ends of pipe body, the sealing cap includes the sealing portion being connected with pipe body and the connecting portion being integrally formed with sealing portion;The utility model is assembled into a kind of combined solid adsorbent material according to the order of adsorption strength from small to big with 4 different specific surface area solid adsorbents, can effectively adsorb 24 kinds of common vapour state organic toxicants, with higher adsorption capacity, not easy to occur penetration phenomenon.

The application discloses a carbon dioxide capturing equipment for flue gas treatment, which comprises a negative pressure box, a control panel is fixedly installed on one side of the bottom end of the negative pressure box, a gas collecting hopper is arranged at the front end of the negative pressure box, two air vent grooves are formed in the top end and the bottom end of the gas collecting hopper, an outer air inlet adjusting assembly is installed in the air vent grooves, the outer air inlet adjusting assembly comprises a sealing plate, a motor is installed on one side of the sealing plate, a capturing box is arranged at the rear end of the negative pressure box, a plurality of gas flow meters are fixedly installed in the rear end box body of the capturing box, a negative pressure pipe is fixedly installed in the side box body of the capturing box, a negative pressure fan one is fixedly installed in the inside of the negative pressure pipe, a plurality of filler assemblies are arranged on the front face of the capturing box, and the carbon dioxide can be prevented from overflowing in the heating and desorption process, the desorption can be timely performed, the filler is prevented from being blocked, the capturing amount is large, the equipment is prevented from being repeatedly started and stopped in a short time, the heating and desorption are performed, and the energy consumption is reduced.

This invention relates to the field of environmental analysis and testing technology. Addressing the problems of limited specific surface area, uneven mass transfer during stirring, and low desorption efficiency in existing membrane or tubular enrichers, it provides a rapid enricher using a stirred silicone rubber filament bundle. This enricher consists of 2-300 silicone rubber filaments bound into a bundle by a fixed head, connected to an electric drill via a connecting rod, and can be rotated and stirred in water samples at 100-3000 rpm. After enrichment, the bundle is placed in a thermal desorption container, where organic matter is desorbed by heating and then detected by ion mobility spectrometry along with the carrier gas. Compared to membrane / tubular structures, the filament bundle has a larger specific surface area, stronger turbulence during stirring, and effectively improved enrichment efficiency. Furthermore, the filament bundle is flexible and not easily broken, making it suitable for rapid on-site detection of complex matrix water and air samples.

This application provides a computer simulation-based method and system for simulating thermal desorption, mass transfer, and heat transfer, relating to the field of computer simulation technology. This application obtains a constructed geometric model of a contaminated soil pile and acquires multiple sets of pore pressure gradients at different depths within the contaminated soil pile at different times, along with corresponding gas Darcy velocities. Support vector regression is used to perform regression analysis on these multiple sets of pore pressure gradients and gas Darcy velocities to calculate the permeability tensor. The Darcy resistance term in the momentum conservation equation is corrected based on the permeability tensor of each grid cell, generating a gas flow equation for each grid cell. The gas flow equations of all grid cells are then combined to obtain the gas velocity field. The velocity vector is used as a convection parameter and substituted into the pre-set heat transport equation and pollutant transport equation to obtain the simulation results of thermal desorption, mass transfer, and heat transfer, achieving accurate simulation of the dynamic permeability changes caused by the gas slippage effect under high vacuum extraction.

The application provides an air treatment device, which comprises a shell, a first air wheel, a purification net and a heating body. The shell is internally provided with a containing cavity. The shell is externally provided with an air inlet and an air outlet, which are in communication with the containing cavity. The first air wheel is arranged in the containing cavity. The purification net is arranged adjacent to the air inlet. The heating body is attached to the purification net. The air treatment device has a desorption mode. When the air treatment device is in the desorption mode, the heating body is turned on, the pollutants on the purification net are heated and desorbed, the airflow flows into the air inlet, and the airflow carrying the pollutants flows out of the air outlet. Thus, the application solves the problem that the air treatment device in the prior art needs to frequently replace the purification net.

This invention discloses an integrated high-purity gas filter device and method, relating to the field of gas filtration technology. The device includes an adjustable rotor pump, a guide valve, and two cylindrical sections (left and right). Each cylindrical section houses a composite filter element, a sintered filter element, and a vibrating electrostatic precipitator. The adjustable rotor pump delivers gas to one of the cylindrical sections via the guide valve. The gas sequentially passes through the composite filter element, the vibrating electrostatic precipitator, and the sintered filter element, completing multi-stage purification. The adjustable rotor pump uses an adjusting solenoid to change the volume of the eccentric cavity to stably regulate the gas supply flow. The guide valve controls the operation of one cylindrical section in use and the other in standby mode. An intermediate pipe allows the standby cylindrical section to be back-purged by the output gas from the working section while offline, and this, combined with a heater, performs thermal desorption and regeneration of the composite filter element. This invention integrates gas supply, multi-stage purification, and online cleaning functions into a single unit, achieving high-precision filtration and continuous stable operation within a compact structure, effectively extending the filter element's lifespan.

The application discloses a method for determining the content of polychlorobenzene and polychlorobutadiene in ambient air, which comprises the following steps: (1) using a composite adsorption tube to adsorb and collect target substances in air, and then pressurizing and sealing the composite adsorption tube after the collection is completed; (2) placing the composite adsorption tube with the adsorbed target substances in a thermal desorption instrument to perform primary thermal desorption, and then introducing the target substances into a gas chromatography mass spectrometry analysis system after secondary focusing by a cold trap for analysis; the target substances are polychlorobenzene and polychlorobutadiene. The method can realize synchronous and accurate qualitative and quantitative analysis of wide-boiling-point chlorine-containing organic substances in a complex environmental matrix.

This invention discloses a high-strength chromium corundum brick and its preparation process, belonging to the field of refractory materials technology. The process includes: S1, using tabular corundum, fused white corundum fine powder, ultrafine activated alumina, monoclinic zirconia micro powder, and polymer microspheres as raw materials, with the Dinger-Funk modulus q controlled at 0.27-0.33, and obtaining a three-dimensional porous framework with interconnected pores through molding and thermal desorption of pore-forming agents; S2, preparing a precursor solution containing Cr, Mg, Ti, Fe, and Mn, with a molar ratio of Cr:Mg:Ti:Fe:Mn=2:1:1:1:1, and a configuration entropy ≥1.5R; S3, driving the solution to penetrate into the pores through pressure difference; S4, using variable pressure pulsating moisture curing to cause in-situ hydrolysis and condensation of the precursor to form a gel; S5, applying a microwave field to assist in gel removal at 400-800℃, followed by high-temperature sintering. This invention improves the material's strength, thermal shock resistance, and slag erosion resistance by combining high-entropy component design with deep penetration and in-situ curing, effectively inhibiting the formation of hexavalent chromium, and solving the problems of insufficient comprehensive performance and environmental risks of traditional chromium corundum bricks.

The application is suitable for the technical field of soil remediation, and provides a thermal desorption equipment for saline-alkali soil remediation, which comprises a treatment barrel and further comprises a separation module, the separation module comprises a hollow main shaft installed in the interior of the treatment barrel, the top of the hollow main shaft penetrates through the top wall of the treatment barrel, a driving unit for driving the hollow main shaft to rotate is installed on the top of the treatment barrel, a plurality of stirring pipes are annularly installed in the region of the interior of the treatment barrel where the hollow main shaft is located, the stirring pipes are in communication with the interior of the hollow main shaft, a plurality of arc-shaped separation plates are annularly arranged around the hollow main shaft, the arc-shaped separation plates are sleeved on the stirring pipes and can move along the radial direction of the hollow main shaft, and a control unit for driving each arc-shaped separation plate to synchronously linearly move along the radial direction of the hollow main shaft is further arranged on the stirring pipe. The state of the device is flexible and adjustable, the soil to be treated can be fully stirred and mixed, the working efficiency is high, and the use effect is good.

The application relates to the technical field of power distribution box equipment, and discloses a heat-dissipation and noise-reduction type outdoor power distribution box which comprises a power distribution box body, a double-cavity moisture absorption mechanism is arranged in the power distribution box body, a drip-proof drainage mechanism and a waste heat desorption mechanism are arranged above the double-cavity moisture absorption mechanism, the double-cavity moisture absorption mechanism is driven by a pulse electromagnetic push rod driving gear and rack and cooperates with a one-way clutch, so that the moisture absorption roller is driven to rotate step by step, the medium realizes alternating circulation in the moisture absorption area and the regeneration semi-area, the waste heat desorption mechanism uses a gravity heat pipe to migrate waste heat in the box, a heat radiation field is constructed through heat dissipation fins to perform zero-energy-consumption heat desorption on the medium in the regeneration semi-area, the drip-proof drainage mechanism uses a top cover and super-hydrophobic flow guide louvers to condense water, and the residual shock is transmitted to the condensate through a vibration transmission connecting rod to actively peel off the condensate, and the condensate is completely drained through a drainage groove. The application solves the problems of easy saturation of the dehumidification medium, high regeneration energy consumption and secondary condensation and dripping, and guarantees safe and stable operation of the power distribution box.

This invention belongs to the field of solid waste resource utilization, specifically relating to a graded thermal activation method and system for clay solid waste. The invention utilizes a heterogeneous zoned gas-solid fluidized bed reactor, dividing the reactor into a low-speed purification zone and a high-speed crystallization zone, constructing an integrated process system with functional zones for temperature grading, solid waste component differentiation, purification / crystallization. The entire process system exhibits highly synergistic coupling of material and energy flows. Through a thermal desorption system and a drying system, high-temperature flue gas waste heat can be recovered in stages, while simultaneously removing volatile pollutants. This invention reduces the thermal activation cost of clay solid waste, reduces carbon emissions, achieves harmless treatment of clay solid waste, and increases its added value. Furthermore, this invention has extremely high treatment efficiency for clay solid waste, effectively and efficiently solving problems such as the accumulation and land occupation associated with clay solid waste, and has promising application prospects.

A pyrolysis sample injector and chromatographic analyzer, relating to the field of chromatographic analysis technology, includes a frame, a drive mechanism, a heating mechanism, a gas path connector, and an injection mechanism. Both the drive mechanism and the heating mechanism are mounted on the frame, which is used to position the sample tube. The drive mechanism is connected to the heating mechanism and is used to drive the heating mechanism to approach and contact the sample tube when the heating mechanism reaches a set temperature, thereby heating the sample tube. The gas path connector is used to connect to the sample tube and communicate with its bottom end. The injection mechanism is used to communicate with the top of the sample tube, allowing the pyrolysis gas inside the sample tube to enter the injection mechanism. It has advantages such as rapid heating rate, precise temperature control, no cross-contamination, and small dead volume, and can also adapt to traditional thermal desorption sample processing, with low operating costs.

The present application belongs to the technical field of soil and sediment detection, and relates to a method for determining methyl acrylate and methyl methacrylate in soil and sediment, which comprises sample collection and moisture content determination, sample pretreatment, purging and trapping enrichment, gas chromatography-mass spectrometry detection and internal standard method quantification. By adding an internal standard and a surrogate standard solution to the sample, after purging, dry blowing, thermal desorption and baking treatment, the sample is separated by split injection and programmed temperature chromatography, data is collected in full scan mode, qualitative analysis is performed according to retention time and characteristic ions, and quantitative analysis is performed by internal standard standard curve method. The present method is suitable for soil and sediment matrix, can eliminate matrix interference, has no target compound detection in blank, and meets the requirements of environmental monitoring in terms of detection sensitivity, precision and accuracy. The present method is convenient to operate, has strong stability, can realize accurate quantitative detection of methyl acrylate and methyl methacrylate in soil and sediment, and is suitable for actual environmental monitoring and batch sample analysis.

The application relates to the field of analytical test technology and discloses a desorption ionization source for small mass spectrometry in a low-pressure environment, which comprises a low-pressure desorption cavity, a sample tray, a metal capillary, a discontinuous atmospheric pressure interface, a quartz light window, a halogen lamp, a vacuum gauge, an electromagnetic valve, a gas suction pump, a dopant bottle, a VUV lamp and a stepping motor; the application places a sample in a limited-volume low-pressure environment to perform thermal desorption, reduces neutral particles in the thermal desorption cavity, makes the desorption cavity be full of the sample to be measured after the sample is desorbed, improves ion utilization rate, and further improves instrument sensitivity; meanwhile, the application reduces photon absorption of the VUV lamp by oxygen and water, and improves sample ionization efficiency.

This invention discloses a method and apparatus for identifying modified recycled materials based on machine learning algorithms. The method includes: obtaining recycled plastics and virgin materials of the same type, mixing them in a certain proportion and melt-extruding them to obtain modified virgin material and modified recycled material samples; performing solid-phase microextraction and thermal desorption treatment on the two samples to obtain volatile component data; establishing and optimizing a model based on the data to obtain an identification model, which is then used to predict blind samples, and the category of the blind samples is determined by a result in which more than half of the samples are consistent. This invention proposes a method and apparatus for identifying modified recycled materials based on machine learning algorithms. By obtaining volatile component information data of modified virgin materials and modified recycled materials through extraction and thermal desorption treatment, it can provide a clear basis for identification. By establishing a model and determining the category of blind samples by a prediction result in which more than half of the samples are consistent, the accuracy of identification can be improved, and the problem of difficulty in efficiently and accurately identifying modified recycled materials and modified virgin materials of the same type of plastic can be solved.

The present application relates to atmospheric pressure ion manipulation technology, specifically, the present application discloses a kind of detection method of prohibited compound in complex matrix, realize the removal of solvent and low-boiling point matrix in liquid sample by pre-heating pretreatment;Using quadrupole mass spectrometer equipped with thermal desorption sampler and atmospheric ion source as detection instrument;1-5 μL drop of liquid sample to be measured is added on sample sheet, at the temperature of pre-heating 50-280 DEG C (preferably 160-180 DEG C) processing time 10 seconds to 10 minutes (preferably 4-6 minutes), realize the rapid volatilization of solvent and low-boiling point matrix in liquid sample;Finally, sample sheet is inserted into thermal desorption ionization cavity for gasification and ionization, start mass spectrum scanning, sample mass spectrum can be obtained;The result of the above detection is compared with the characteristic spectrum library of common toxicant of quadrupole mass spectrometer to determine whether prohibited compound is contained in beverage, electronic cigarette oil or not.The present application improves selectivity and identification accuracy.