63 results about "Tenax" patented technology

The present invention relates to a system and method for sampling a gas flow to measure one or more contaminants within a semiconductor processing tool. The system includes a portable unit containing one or more dry traps, Tenax traps and, if desired, wet impingers. The unit is coupled to a gas flow in a clean room and the dry traps. Tenax traps and wet impingers measure contaminants contained in the gas supply for a determined sampling interval. When the sampling interval is done, the unit is sent to an analysis facility for processing.

The present invention relates to a system and method for sampling a gas flow to measure one or more contaminants within a semiconductor processing tool. The system includes a portable unit containing one or more dry traps, Tenax traps and, if desired, wet impingers. The unit is coupled to a gas flow in a clean room and the dry traps. Tenax traps and wet impingers measure contaminants contained in the gas supply for a determined sampling interval. When the sampling interval is done, the unit is sent to an analysis facility for processing.

The invention relates to a preparation method of a metal carrier Tenax coating stirring and extracting rod, which comprises the following steps of: a, selecting and preprocessing a metal rod; b, synthesizing heat-resistant epoxy resin; c, manufacturing a stirring rod coating; d, curing the coating; and e, removing impurities of the extracting rod body, wherein the extracting rod is used in a stirring manner, and the metal is iron, nickel, cobalt, stainless steel or alloy; and when the extracting rod is used in a headspace or ultrasonic manner, the metal is stainless steel, copper, aluminum or alloy. Tenax is fixed on the surface of the metal rod by using the synthesized heat-resistant epoxy resin or organic silicon resin to form a coating material with heat stability and solvent washing resistance, thus the extracting rod realizes the enrichment of trace organic matters. The invention is especially suitable for processing samples of soil, air, essence and spice, indoor air, alcohol, phenol, amine-aldehyde, ketone, aryl halides and the like.

The invention relates to a soil contaminant detection method in the field of environment analysis, specifically to a method for analyzing the contents of three different occurrence forms of organic pollutants in soil. Directed at the problem that conventional methods which usually evaluate the contamination degree of soil on the basis of the total concentration of organic pollutants is not scientific enough, the method provided by the invention employs a pretreatment method consisting of Tenax resin adsorption, extraction with an organic solvent, alkaline and thermal hydrolysis and re-extraction with the organic solvent for graded extraction and cooperatively uses gas chromatography, combined gas chromatography and mass spectrometry, liquid chromatography and liquid chromatographic-gas chromatographic apparatus detection and analysis technology, so the contents of three different occurrence forms, including a soluble form, an adsorption form and a bound form, of organic pollutants in soil are detected. The method provided by the invention can accurately and quantitatively analyze the contents of the three different occurrence forms of organic pollutants in soil and has good application value in soil contamination risk evaluation and pollution abatement and restoration.

The invention relates to an integrated adsorption tube for benzene and total volatile organic compounds in indoor air and a detection method thereof, comprising an adsorption tube capable of simultaneously collecting samples of benzene and total volatile organic compounds, and Tenax-TA Adsorbent, coconut shell activated carbon adsorbent and Tenax-TA adsorbent, the adsorption tube of the present invention can simultaneously sample benzene and total volatile organic compounds in indoor air, and can use the benzene data in the analysis results of total volatile organic compounds As the structure of benzene analyzed separately, the detection result has good reproducibility, the recovery rate of benzene and total volatile organic compounds is high, the detection cost is reduced, and the experiment is convenient.

The invention discloses a method for testing the contents of 16 types of polycyclic aromatic hydrocarbons in incense combustion smoke by a thermal desorption/gas chromatography-mass spectrometry. An incense combustion sample combusts in a space being 1.8 m*1.8 m*1.8 m; smoke is collected into a heat desorption pipe containing Tenax-TA filler through a sampling pump; after the heat desorption, GC-MS is used for detection in a selective ion mode (SIM); an external standard method is used for quantification. The result shows that the concentration of 16 types of polycyclic aromatic hydrocarbons shows a good linear relationship in a concentration range of 0.05 to 1.0 mg/L; the relative coefficient r is greater than 0.995; the method detection limit is 0.06 to 1.10 ng/m<3>; the average adding standard recovery rate is 89.2 to 100.7 percent; the relative standard deviation (RSD, n being equal to 6) is 1.7 percent to 5.0 percent. The method has the advantages that the 16 types of polycyclic aromatic hydrocarbons in the incense combustion smoke can be effectively subjected to qualitative and quantitative analysis; the characteristics of simplicity, high speed, high reliability and the likeare realized; the experiment requirements can be met.

The invention discloses a sampling device of gaseous contaminant in the material crushing process, which comprises a crusher. The feeding hole of the crusher extends into a rotary barrel, and the discharge hole of the rotary barrel extends into a storing box. The storing box is communicated with a dust collecting cylinder, and the dust collecting cylinder is communicated with a draught fan through a dust removing bag. A draught fan is connected with a gas buffer pipe, and four sampling rubber pipes are fixed in the gas buffer pipe. The first sampling rubber pipe is connected with a first sampler through phenolic absorbing liquid, the second sampling rubber pipe is connected with the first sampler through brominated hydrogen absorbing liquid, the third sampling rubber pipe is connected with a second sampler through an activated charcoal absorbing pipe, and the fourth sampling rubber pipe is connected with the second sampler through a Tenax-GC pipe. Excess gas is exhausted from a gas diversion port. Aiming at gaseous contaminant possibly produced during crushing, the gas samplers are used for respectively sampling different materials at an exhaust port. The sampling device can ensure that the contaminant is effectively monitored and data information is obtained and has the advantage of simple structure.

The invention relates to the technical field of odor testing, and provides an in-vehicle odor source detection method. The method comprises the steps that a Tenax sampling tube is used for collectingan in-vehicle gas sample of a target vehicle, a first corresponding relation between a gas substance peak and retention time is obtained through a gas chromatograph-mass spectrometer for one part, anda second corresponding relation among odor intensity, odor types and retention time is determined through an olfactory discriminator for the other part; a first target gas substance in the in-vehiclegas sample is determined according to the first corresponding relationship and the second corresponding relationship; all the parts are put into a polyvinyl fluoride sampling bag, an experiment is carried out in an environment test cabin, a gas sample of each part is collected by using a Tenax sampling tube, and a second target gas substance of the gas sample of each part is determined; and the odor source part in the vehicle is determined according to the target gas substance of each part gas sample. According to the method, odor tracing of the target gas substance between the target vehicleand the internal parts can be achieved.

The invention discloses a thermal desorption and sampling device for methyl mercury. The thermal desorption and sampling device comprises a flow meter and a thermal desorption device, wherein the thermal desorption device comprises a heating coil, a heating power supply, a heating switch and a heating power supply and voltage regulator; when an experiment for determining the content of the methyl mercury is carried out, an argon bottle is firstly opened; argon enters the lower end of the flow meter through a PFA gas pipeline, then flows out from the upper end of the flow meter, and enters a methyl mercury-enriched Tenax adsorption pipe through the PFA gas pipeline; and the heating coil sleeves the adsorption pipe. According to the thermal desorption and sampling device, carrier gas flow control and heating desorption devices are integrated; the thermal desorption and sampling device is simple in structure and convenient to operate; thermal desorption and sampling operation on the methyl mercury are greatly simplified; experiment efficiency is improved; and compared with devices with the similar functions, the thermal desorption and sampling device is extremely low in construction cost.

The invention relates to a measuring method of low-concentration odorous gas, comprising the following steps: adsorption treatment: at the normal temperature of 20-25 DEG C, filling 100L of odorous gas into a glass tube filled with solid Tenax poly 2,6-diphenyl-p-phenvlene and activated carbon to completely adsorb odorous substances in the odorous gas; heat resolution treatment: heating the glass tube in the first step to a specific temperature, and resolving the adsorbed odorous substances again; blowing treatment: carrying out desorption on the odorous substances by 10L of carrier gas N2; mixing the odorous substances with N2; flowing out and collecting from the other end to obtain the odorous gas which is condensed by 10 times; measuring the concentration of the odorous gas concentrated by 10 times with a GB/T14675-93 three-point comparative smelly bag method; calculating to obtain the concentration of the odorous gas of the original odorous gas. By using the method of the invention, the low-concentration odorous gas is condensed to reach the range which can be measured by the existing three-point comparative smelly bag method. The measuring method of the invention has the advantages of no pollution, low cost, good deodorization effect and the like, is economic, convenient, quick and easy to realize, and is more suitable for measuring the concentration of the odorous gas under low-concentration environment.

The invention discloses a fire coal combustion source discharged carbonyl compound sampling device. The sampling device comprises an air inlet part, a first-grade dilution system, a second-grade dilution system, a staying chamber and a sampling part. A combustion temperature can influence carbonyl compound gas-particle distribution and thus in order to simulate cooling, dilution and coagulation of flue gas discharged into air, the staying chamber is built and used after flue gas dilution. The sampling part adopts a self-made sampling tube coated with a pentafluorophenyl hydrazine (PFPH) Tenax-TA adsorbent to acquire a sample and utilizes a steam coating process and an introduction port thermal desorption analysis method so that solvent-caused influence on a detection result is avoided. The device is simple and easy, utilizes a dilution system to adjust a dilution ratio and is suitable for acquisition of other high-flue gas concentration gas substances.

The invention discloses a thermal desorption-gas phase separation-thermal pyrolysis system based on phenylated derived organic mercury. The thermal desorption-gas phase separation-thermal pyrolysis system comprises a column box and a pressure-regulation and temperature-control switch box, wherein the pressure-regulation and temperature-control switch box is arranged at one end of the column box; the column box and the pressure-regulation and temperature-control switch box are provided with a thermal desorption assembly, a gas phase separation assembly, a thermal pyrolysis assembly and an assisting assembly; the thermal desorption assembly comprises a thermal desorption heating wire switch, a thermal desorption heating wire time control switch, a thermal desorption heating wire pressure regulator, a thermal analysis heating wire pressure regulator pressure-regulation knob, a thermal desorption heating wire and a Tenax adsorption pipe; the Tenax adsorption pipe is transversely mounted at the top of the column box; the thermal desorption heating wire is mounted at the outer part of the Tenax adsorption pipe. According to the thermal desorption-gas phase separation-thermal pyrolysis system disclosed by the invention, thermal desorption, gas phase separation and thermal pyrolysis parts are integrated, and methyl mercury and ethyl mercury in a sample can be effectively determined; compared with a traditional gas chromatograph, a programed temperature rising device has a smaller size, so that an experiment space is saved; meanwhile, programed temperature control can be realized, and temperature can be increased section by section.

The invention relates to an analysis method for reaction products of preparing ethylene glycol by ethylene oxide catalytic hydration, which is mainly used for solving the problems of overlapped peak and furcation of chromatographic peak in the presence of a large amount of water as well as poor analysis result repeatability in the existing glycol, diethylene glycol and triethylene glycol analysistechnology. The technical scheme of the analysis method of the invention is as follows: a gas chromatograph is used to perform the analysis, wherein the reaction product passes through Tenax TA polymeric adsorbent before entering into the chromatographic column, and then the follow-up analysis is carried out; and the internal standard substance is a butyl cellosolve aqueous solution, thus the problems in the prior art can be preferably solved, and the analysis method can be used for tracking and analyzing the technological products for preparation of ethylene glycol by ethylene oxide catalytic hydration.

The invention provides a two-section type gas sampling tube as well as a preparation method and application thereof. Tenax TA and a Carboxen 1000 carbon molecular sieve are selected as adsorbents to prepare the two-section type gas sampling tube, and the preparation method comprises the following steps: adding a copper net into a hollow tube of an adsorption tube, then adding glass wool, adding a Tenax TA adsorbent, adding glass wool for separation, then adding a Carboxen 1000 carbon molecular sieve, and finally adding glass wool and a copper net in sequence to fix the adsorbents in the tube, so as to obtain a finished product, wherein Tenax TA has relatively good adsorption performance on VOCs (Volatile Organic Compounds) with six or more carbon atoms. The Carboxen 1000 carbon molecular sieve has good adsorbability on VOCs with six or less carbon atoms, and the Carboxen 1000 carbon molecular sieve and the Tenax TA are combined for application, so that various volatile organic compounds released by plastics can be better collected, and the accuracy of qualitative and quantitative analysis of VOCs is improved.

The invention relates to a method for measuring volatile organic compounds released by a bag. The method comprises sampling: putting a bag sample to be detected into a sampling bag, carrying out heating at 70+/-10 DEG C for 3-6h so that the volatile organic compounds in the bag sample to be detected are released into the sampling bag and taking volatile organic compound samples from the sampling bag through a Tenax-TA sampling pipe, and detection: detecting TDS/GC/MS of the Tenax-TA sampling pipe after sampling. The method can accurately determine the content of the releasable volatile organiccompounds in the bag without destroying the samples to be tested, can greatly reduce the detection cost and is economical and environmentally friendly.

The invention relates to a metal carrier Tenax coating stirring and extracting rod which uses metal as a carrier, wherein a coating contains a Tenax adsorbing agent, the extracting rod is used in a stirring manner, the metal is selected from iron, nickel, cobalt, stainless steel or alloy; and the extracting rod is used in a head space or ultrasonic manner, the metal is selected from stainless steel, copper, aluminum or alloy. The extracting rod is used for fixing the Tenax on the surface of the metal rod by using synthetic high-temperature epoxy resin or organic silicon resin to form a coating material with good heat stability and solvent rinsing resistance, thus trace organic matters are enriched. The invention is especially suitable for processing samples, such as soil, atmosphere, essence perfume, indoor air, alcohol, phenol, amine and aldehyde, ketone, aryl halides and the like.

The invention discloses a thermal desorption, gas-phase separation and thermal cracking system based on ethylation derivation of methyl mercury, comprising a thermal desorption part, a gas-phase separation part, a thermal cracking part, a gas flowmeter, a Teflon FEP pipeline and a pressure regulating and temperature control switch chamber, wherein the thermal desorption part comprises a thermal desorption heater strip switch, a thermal desorption heater strip time control switch, a thermal desorption heater strip pressure regulator, a pressure regulating knob of the thermal desorption heater strip pressure regulator, a thermal desorption heater strip and a Tenax adsorption pipe; the gas-phase separation part comprises a heater jacket, a heater jacket switch, an OV-3 packed column and a heater jacket temperature control plate; and the thermal cracking part comprises a thermal cracking heater strip switch, a thermal cracking heater strip time control switch, a thermal cracking heater strip pressure regulator, a pressure regulating knob of the thermal cracking heater strip pressure regulator, a thermal cracking heater strip and a quartz pipe. The system realizes the aim of integration of thermal desorption, gas-phase separation and thermal cracking devices, and simultaneously, each part can be individually operated, thereby saving the analysis time, having low manufacturing cost and greatly reducing experiment cost.

The invention discloses a method for testing harmful volatile matters in a non-metallic material of a passenger vehicle. The method comprises the following steps: putting a non-metal material into a sampling bag; arranging a blank sampling bag with the same specification; separating harmful volatile substances from an adsorption object to be detected through heating; collecting benzene substancesthrough a TENAX sampling tube; extracting benzene substances in the TENAX sampling tube through a thermal desorption system; introducing the benzene substances into a gas chromatography-mass spectrometer; obtaining a quantitative value of each benzene substance through a benzene substance analysis curve; and collecting aldehyde ketone substances through a DNPH sampling tube, eluting the DNPH sampling tube through acetonitrile to prepare an aldehyde ketone substance reagent, guiding the aldehyde ketone substance reagent into a high performance liquid chromatograph-diode array detector, obtaining quantitative values of the aldehyde ketone substances through an aldehyde ketone substance analysis curve, and finally obtaining the concentration of harmful volatile substances through calculation.By detecting the concentration of harmful substances volatilized from various non-metallic materials, the unqualified automotive trim assembly is locked, and targeted improvement is achieved.

The invention belongs to the technical field of environmental monitoring, and discloses a detection method for real-time continuous monitoring of release of volatile organic compounds in a plastic runway and application of the detection method. The method comprises the following steps: (1) putting a sample to be detected into an experimental cabin, and setting temperature and relative humidity of the experimental cabin, air velocity on the surface of the sample and an air replacement rate; (2) after putting the sample, collecting air in the cabin by a constant current sampler, and enabling the extracted air to pass through a Tenax TA adsorption tube; (3) gas chromatography-mass spectrometry detection: fixing the Tenax TA adsorption tube to a two-stage thermal desorption instrument, after thermal desorption, enabling the volatile organic compounds to enter gas chromatography-mass spectrometry for detection, and performing qualitative and semi-quantitative analysis according to an area normalization method. The detection method can be used for simultaneously performing qualitative and semi-quantitative determination on multiple volatile organic compounds, and can be applied to detection of the volatile organic compounds in fields such as plastic runway, automobile seats and furniture.

The invention relates to a method for testing transfer volumes of specific volatile and semi-volatile organic matters in paper and a paperboard, belongs to the technical field of analytic chemistry, and particularly relates to the method for directly testing transferred volatile and semi-volatile compounds by taking Tenax as the simulant by virtue of a headspace gas chromatography-mass spectrometry (HS-GC/MS). The method comprises the following steps: (1) preparing a simulation sample, assembling, and covering the surface of a to-be-tested object with the Tenax; (2) simulating the assembled sample in a normal drying oven under a temperature testing condition for required time; (3) directly analyzing a simulant by virtue of the HS-GC/MS, so as to obtain the transfer volumes. The method can be used for effectively testing the transfer volumes of the specific volatile and semi-volatile organic matters in the paper and the paperboard, is feasible, easy to operate, accurate and sensitive and has popularization and application values.