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55 results about "Purge and trap" patented technology

Purge and Trap System. A purge and trap system is a method used to concentrate and prepare volatile organic compounds for analysis in a gas chromatograph (GC). Purge and trap systems are used in the environmental sciences to prepare soil and water samples for detection of contaminants.

Decompressed purge-and-trap processing equipment for non-volatile organic compound in water sample and processing method thereof

The invention discloses decompressed purge-and-trap processing equipment for a non-volatile organic compound in a water sample and a processing method thereof. The invention is characterized in that the equipment is formed by sequentially connecting a sample heater (1), a purge bottle (2), a trapper (3), a pressure controller (4) and a pump (5), wherein purge gas (6) is connected with the purge bottle (2) through a purge gas inlet (7); the purge bottle is connected with the trapper (3) through a purge gas outlet (8); the trapper (3) is connected with the pump (5) through the pressure controller (4); the gas trapped by the trapper (3) is taken out and then placed into a heater (13) of the trapper; chromatographic carrier gas (14) is connected with a chromatographic injection port (12) in a column oven (11) through the trapper (3) and a transmission pipeline (15); and the chromatographic injection port is connected with a chromatographic detector (9) through a chromatographic column (10). The processing method comprises the following steps: forming a negative pressure environment around a test sample under the action of the pump, and increasing the vapor pressure of the non-volatile organic compound under the negative pressure environment; purging the bottom of the sample by utilizing inert gas so that the target compound can be trapped by the trapper after being blown out from the sample; and finally, resolving the target compound at high temperature and then carrying out chromatographic analysis.
Owner:四川省环境监测中心站

Analysis method for detecting ten high-toxic disinfection byproducts in drinking water

InactiveCN103472167AHigh sample costSample testing is convenientComponent separationDisinfection by-productOrganic solvent
The invention relates to an analysis method for detecting ten high-toxic disinfection byproducts in drinking water. The method comprises the steps of pretreating a sample with a purging and trapping device (P&T), then allowing the sample to enter a gas chromatograph-mass spectrometer (GC/MS) for analysis, and determining contents of the ten disinfection byproducts in the sample according to an analysis chromatogram of the sample and standard working curves of the ten disinfection byproducts. Compared with the prior art, the method adopts the purging and trapping device to gather the disinfection byproducts (DBPs) in the water, and determines instrument parameter conditions; reagents such as salt and an extraction agent are not required to be used; an experimenter is prevented from being directly contacted with toxic and harmful organic solvents; simultaneously, the sample detection time is saved; the sample detection cost is lowered; the GC/MS is adopted for measurement, and the detailed instrument parameter conditions are determined, so that phenomena such as peaking and trailing of the ten DBPs can be avoided; the normal peaking of the DBPs is ensured; and a maximum detection limit (MDL) and a smaller relative standard deviation (RSD) can be obtained.
Owner:TONGJI UNIV

Refrigeration-type purge and trap instrument being applicable to nitric oxide

The invention relates to a refrigeration-type purge and trap instrument being applicable to nitric oxide, comprising an inert gas steel cylinder, a mass flow controller, a seawater sample bottle, a gas stripping chamber, an adsorption tube, a trapping device, a control circuit board and a gas circuit formed by connecting a pipeline and an electromagnetic valve. Under the control of the mass flow controller, inert gas in the inert gas steel cylinder is filled into the seawater sample bottle, and water sample in the sample bottle enters into the gas stripping chamber under the action of pressure; the inert gas purges N2O in water body sample from the bottom of the gas stripping chamber, inert gas carrier gas carrying the N2O enters into the adsorption tube from the gas stripping chamber, and moisture and impurity of the carrier gas are absorbed and removed inside the adsorption tube; the carrier gas carrying the N2O then enters into a trapping tube of the trapping device and is used for trapping at the low temperature; after trapping, stop valves at the two ends of the trapping tube are closed, and the N2O is resolved out when the temperature of the trapping tube raises; after resolution, the stop valves at the two ends of the trapping tube are opened, and the carrier gas enters into the trapping tube and brings the N2O into gas chromatogram to be analyzed and detected.
Owner:NATIONAL MARINE ENVIRONMENTAL MONITORING CENTRE

On-line analyzer for aquatic VOCs (Volatile Organic Chemicals)

The invention relates to an on-line analyzer for aquatic VOCs (Volatile Organic Chemicals) based on a purge and trap-gas chromatography principle, in particular to an instrument combined with functions of automatic sampling, purge and trap pretreatment and gas chromatography. After quantitative sampling of a water sample through an automatic sampling device, the water sample is purged through controlling purge gas, a water matrix is separated and trapped by a trap after the aquatic VOCs are purged; a flow path is switched through a switch valve, so that carrier gas of a gas chromatograph passes through the trap, the trap is instantly heated to analyze absorbed organic matters, and then the carrier gas carrying the analyzed organic matters is separated and analyzed after entering a gas chromatograph analysis module. Each module is synchronously controlled by a microprocessor of the on-line analyzer for the aquatic VOCs, control software synchronously has functions of instrument operation control, and data acquisition and processing, the uniform control is realized, and the delay and the function conflict are reduced. The on-line analyzer has the advantages of simple structure, simplicity in operation, and capability of synchronously realizing sampling, pretreatment and on-line analysis of the aquatic VOCs.
Owner:LIHE TECH (HUNAN) CO LTD

Method for detecting components of flavor substance in milk

The invention discloses a method for detecting components of a flavor substance in milk, mainly comprising the following steps of: sampling a milk sample; placing the sample in a bottle; adding with NaCl, sufficiently and uniformly shaking so as to saturate the sample; sealing the bottle by a cover; purging top part volatile flavor substance by an automatic purge and trap concentrator; adsorbing the volatile flavor substance into a capillary trap which is filled with Tenax adsorbing material; stirring and heating the sample; introducing helium gas in the sample; and finally performing thermal analysis to analyze the volatile flavor substance, and automatically assaying by starting gas chromatograph-mass spectrometer (GC-MS) collecting data. The detecting method is a quick qualitative assaying method which is convenient, fast, excellent in reproducibility, short in using time and the like.
Owner:INNER MONGOLIA AUTONOMOUS REGION ACAD OF AGRI & ANIMAL HUSBANDRY SCI

Method for determining migration quantity of volatile organic compounds in adhesive sticker for food label in water-based food simulating object

ActiveCN103575848AOvercome the disadvantage of not being able to directly enter water samplesHigh detection sensitivityComponent separationWater basedMass spectrometry detector
The invention discloses a method for determining the migration quantity of volatile organic compounds in an adhesive sticker for a food label in a water-based food simulating object. The method comprises the following steps: performing a direct or indirect migration test on the adhesive sticker for the food label through a water-based food simulating solution; sampling the water-based food simulating solution through purging and trapping; separating 10 volatile organic compounds through HP-5ms or chromatographic columns with similar properties; performing detection through a mass spectrometry detector; performing quantification through an external standard method, wherein the 10 volatile organic compounds include nonene, 2-ethylhexanol, 1,2,4,5-tetramethylbenzene, camphor, 1-dodecene, naphthalene, 2-ethylhexyl acrylate, 1-methylnaphthalene, 1-undecanol and dodecyl aldehyde. The method is accurate in test, easy to operate, high in efficiency, quick, high in sensitivity and high in practicality, is applicable to qualitative and quantitative determination on the volatile organic compounds in the adhesive sticker for the food label through a manufacturing enterprise of the adhesive sticker for the food label and relevant government supervision departments, and can be used for avoiding harm to the physical health of a consumer caused by over-large migration quantity of the volatile organic compounds.
Owner:厦门佰能检验技术服务有限公司

Method for analyzing hexachloroethane in soil or sediment by purge-and-trap gas chromatography- mass spectrometry

InactiveCN110426482AEasy to analyzeSimple, efficient and accurate analysisComponent separationOrganic solventMass Spectrometry-Mass Spectrometry
The invention provides a method for analyzing hexachloroethane in soil or sediment by purge-and-trap gas chromatography- mass spectrometry. The method comprises the following steps of performing purge-and-trap extraction on the hexachloroethane in the soil or sediment to obtain extracted hexachloroethane; and analyzing the extracted hexachloroethane by a gas chromatography-mass spectrometry device. The invention provides simple, high-efficient and accurate method for analyzing the hexachloroethane in the soil or sediment, purge-and-trap can be performed on the hexachloroethane in the soil or sediment, the pre-processing is simple and rapid, the semi-volatile organic compound in the soil or sediment can be effectively purged, no organic solvent is needed for extraction, so that the enrichment efficiency is high, and the method is a high-efficiency pre-processing method. The hyxachloroethane in the coil or sediment is analyzed by the gas chromatography-mass spectrometry device, and the method has the characteristics of low detection limit, high accuracy, rapidness and sensitivity.
Owner:上海纺织节能环保中心

Purging and trapping device of VOCs (volatile organic chemicals) in water and purging and trapping method using purging and trapping device

The invention discloses a purging and trapping device of VOCs (volatile organic chemicals) in water and a purging and trapping method using the purging and trapping device. The purging and trapping device comprises a mixed gas carrying gas inlet, a purging pipe, a pure gas carrying gas inlet, a dehydration device, a cyclone separator and an enrichment separation device, wherein the mixed gas carrying gas inlet is connected with one end of the purging pipe; the other end of the purging pipe is connected with a water sample inlet and outlet and a purging gas outlet and is connected with the puregas carrying gas inlet and the dehydration device through a three-way valve; the cyclone separator is arranged between the dehydration device and the enrichment separation device; the tail end of theenrichment separation device is connected with a detector. The purging and trapping device has the advantages that the purging and trapping efficiency can be improved; the gas carrying consumption isreduced; the time is shortened. The mixed gas is used for purging, the mass transferring speed of the VOCs between liquid and gas is accelerated; the purging and trapping rate on the VOCs in water isincreased; the detection limit of the VOCs is improved; the evaporation quantity of water vapor can be reduced; the next water removal, trapping and detection is facilitated.
Owner:HOHAI UNIV

Method for analysis of thiophene in water by purge and trap coupled with GC-MS

ActiveCN106596738ARealize quantitative and qualitative detectionImprove detection efficiencyComponent separationRetention timeGas phase
The invention discloses a method for analysis of thiophene in water by purge and trap coupled with GC-MS, the method is as follows: firstly, adding a proper amount of methanol as a preservative into a collected water sample, taking 20ml of the water sample into a sample bottle, adding 0.2g of sodium chloride, gently shaking to dissolve the sodium chloride, adding an internal standard solution, and sealing the sample bottle; putting the sample bottle into a purge and trap sample injector, setting purge and trap conditions, and performing purge and trap on the sample bottle to purge the thiophene out of the water to enter a gas chromatograph-mass spectrometer GC-MS; setting conditions of gas chromatography and mass spectrometry conditions of the gas chromatograph-mass spectrometer, analyzing the thiophene according to the set conditions, qualitatively analyzing the thiophene in the water sample according to retention time and ion fragments, and quantitatively analyzing the response value of the thiophene in the water sample by an internal standard method. By the purge and trap coupled with GC-MS, the thiophene is separated from the water, and quantitative and qualitative detection of the thiophene in the water are realized. The detection efficiency is improved, the experimental process is simplified, and the detection accuracy is improved.
Owner:SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE

Method for rapidly determining content of phenol in wastewater through purge and trap-gas chromatography-mass spectrometry

The invention relates to a method for rapidly determining the content of phenol in wastewater by purge and trap-gas chromatography-mass spectrometry, which comprises the following steps: 1) collecting a wastewater sample, adding phosphoric acid, and adjusting the pH value of the wastewater sample to weak acidity; (2) purging phenol in the wastewater sample by using a purging and trapping sample injector, trapping the phenol by using a trapping trap, and then analyzing the phenol to enter a gas chromatograph-mass spectrometer; and (3) carrying out qualitative and quantitative analysis on the phenol trapped by the trapping trap by using a gas chromatograph-mass spectrometer. Compared with the prior art, the method for measuring the phenol content in the industrial wastewater is simple, rapid, efficient and accurate, the wastewater with complex components and high organic matter concentration can be directly purged, the pretreatment processes such as separation and purification are omitted, an organic solvent is not needed for extraction, the detection cost is reduced, and the method is suitable for large-scale popularization and application. The time for detecting a group of water samples is shortened from two hours to about 30 minutes, and the detection limit is 0.01-1 mg/L.
Owner:SHANGHAI INST OF TECH +1
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