55 results about "Purge and trap" patented technology

Novel metal organic framework (MOF) molecules and methods of synthesizing them are described. MOFs are organometallic crystalline structures that have high sorption capacity due to high surface area, tailorable selectivity, an inert nature, and thermal stability at high temperatures. MOFs may be used as sorbents in preconcentrators for analytical devices to provide orders of magnitude of improved sensitivity in analyte detection. MOFs are also useful as sorbents in new compact and portable micropreconcentrator designs such as a modified purge and trap system and a multi-valve microelectromechanical system (MEMS) to achieve high gain in analyte detection. Further, MOFs may be used as coatings for novel microstructure arrays in micropreconcentrators where the microstructures are designed to increase the surface area to volume ratio inside the micropreconcentrator while minimizing the pressure drop across the micropreconcentrator.

Novel metal organic framework (MOF) molecules and methods of synthesizing them are described. MOFs are organometallic crystalline structures that have high sorption capacity due to high surface area, tailorable selectivity, an inert nature, and thermal stability at high temperatures. MOFs may be used as sorbents in preconcentrators for analytical devices to provide orders of magnitude of improved sensitivity in analyte detection. MOFs are also useful as sorbents in new compact and portable micropreconcentrator designs such as a modified purge and trap system and a multi-valve microelectromechanical system (MEMS) to achieve high gain in analyte detection. Further, MOFs may be used as coatings for novel microstructure arrays in micropreconcentrators where the microstructures are designed to increase the surface area to volume ratio inside the micropreconcentrator while minimizing the pressure drop across the micropreconcentrator.

A purge and trap concentrator system that includes a sparge vessel, and includes a variable gas flow valve for controlling the gas pressure in an analytic trap or the sparge vessel; a sensor that detects both a foaming sample state and a high liquid level in the sparge vessel, using one optical sensor; a control scheme that re-directs the purge gases to a second inlet of the sparge vessel during a foaming condition; a control scheme that uses a split flow to enhance the quantity of sample gases passed from an analytic trap; an electrically powered thermal energy source with a fan raising the sparge vessel temperature via thermal convection.

The invention relates to a heat purge and trap instrument, comprising a heating furnace, a sample furnace, a high-purity nitrogen gas cylinder, a transmission pipe sealably connected with the air outlet of the sample furnace, a trapping pipe sealably connected with the other end of the transmission pipe and a cooling cold trap with the trapping pipe sleeved therein. The invention also relates to a heat purge and trap method. The method successively comprises the following steps of 1. putting a to-be-tested sample in the sample furnace; 2. adsorbing materials with 80-mesh granular Tenax TA; 3. heating the sample furnace to a temperature of 180 DEG C-600 DEG C; 4. opening the high-purity nitrogen gas cylinder and the cooling cold trap, wherein the flow rate of the high-purity nitrogen gas is 20 mL / 80 min; the collecting time lasts for 30-60 minutes; and the cooling cold trap is kept at a temperature of -1.0 DEG C-15.0 DEG C. The heat purge and trap instrument and the heat purge and trap method are in no need of organic reagents and post-enrichment processes, and are suitable for the determination of volatile organic components in solid samples such as rocks, soils, coals and the like. Combined with GC / MS, the sensitivity for detecting alkane organic components is superior to 0.1 ng / g.

The invention belongs to the technical field of analysis and detection, and relates to a detection method for volatile organic compounds in water source pollution, which is mainly used for detection of volatile organic pollutants with peculiar smell in water. The present invention establishes a purge-and-trap-GC-MS method for the determination of multi-component trace VOCs in drinking water, including steps such as sample collection, sample storage, sample measurement, standard curve formulation, and result calculation. The detection conditions of the instrument in the determination step are described in detail, providing a rapid early warning and emergency monitoring technology for sudden accidents of organic polluted water sources.

A purge and trap concentrator system that includes a sparge vessel, and includes a variable gas flow valve for controlling the gas pressure in an analytic trap or the sparge vessel; a sensor that detects both a foaming sample state and a high liquid level in the sparge vessel, using one optical sensor; a control scheme that re-directs the purge gases to a second inlet of the sparge vessel during a foaming condition; a control scheme that uses a split flow to enhance the quantity of sample gases passed from an analytic trap; an electrically powered thermal energy source with a fan raising the sparge vessel temperature via thermal convection.

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.

The invention relates to a method for determining volatile flavor substance of an egg yolk. In the method, an egg yolk is pretreated, and volatile flavor substance in the egg yolk is collected by a purge-and-trap method and then is determined. The volatile flavor substance is determined by adopting a thermal desorption-gas chromatography-mass spectrometer (TCT-GC-MS). By understanding the components of the volatile flavor substance in the egg yolk, feeds can be prepared or a breeding means can be adopted by people as required to make laying hens produce eggs with different flavors so as to produce the eggs with unique flavor and the egg products thereof by a simpler and safer method.

The invention discloses a method for detecting myrcene in soil by combining purging and trapping with GC-MS. The method comprises the following steps: firstly, collecting a soil or sediment sample, removing foreign matters, and adding 5.0 g of the sample into 5mL of ultrapure water; then placing the obtained sample in a purging and trapping sample injector, setting purging and trapping conditions to perform purging and trapping on the sample, purging myrcene in the sample out and entering a gas chromatograph-mass spectrometer, and setting chromatographic conditions of the gas chromatograph-mass spectrometer to analyze myrcene. According to the method, purging and trapping are combined with GC-MS, the detection efficiency is improved, the detection precision is greatly improved, the method is low in detection limit and good in repeatability, and myrcene in soil or sediment can be independently detected with high precision.