450 results about "Flame ionization detector" patented technology

The invention discloses a method for analyzing a residual quantity of a solvent in a compound by GC (Gas Chromatograph). The method comprises the step of carrying out separation by adopting the following chromatographic conditions: a detector is a hydrogen flame ionization detector, the temperature of the detector is 200 DEG C to 300 DEG C and is preferably 300 DEG C, and the temperature of an injection opening is 180 DEG C to 250 DEG C and is preferably 220 DEG C; a chromatographic column is a medium-polarity capillary gas chromatography column and adopts a programmed temperature process of keeping the temperature of 40 to 60 DEG C for 3 to 10min, then heating to the temperature of 100 to 140 DEG C at a speed of 5 to 15 DEG C / min, keeping the temperature of 100 to 140 DEG C for 1 to 10min, heating to the temperature of 200 to 230 DEG C at a speed of 15 to 25 DEG C / min and keeping the temperature of 200 to 230 DEG C for 1 to 20min; carrier gas is nitrogen, hydrogen or argon and is preferably nitrogen, and the flow rate of the carrier gas is 1ml / min to 10ml / min and is preferably 3ml / min; the solvent is selected from one or more of C1 to C6 carboxylic acid, methanol, ethanol, acetonitrile, ethyl acetate, tetrahydrofuran, methylbenzene and N,N-dimethylformamide; the C1 to C6 carboxylic acid is preferably C1 to C4 carboxylic acid and is more preferably acetic acid. When the method is adopted to detect the residual quantity of the solvent, the operation is simplified, time is saved and cost is saved.

The invention provides a crude oil mass fracture maturity evaluation method. The method comprises the following steps: weighing a quantitative crude oil sample and mixing the weighed crude oil sample with methylene dichloride, adding a mixed master standard taking the methylene dichloride as a solvent after standing by for 10-24h, detecting the relative contents of full-mass fractures in the sample such as light dydrocarbon series, adamantane, normal alkane / isoalkane, terpenoid biomarkers, polycyclic aromatic hydrocarbon and homolog, thiophene and aromatic steroid hydrocarbons, indistinguishable compounds UCM and the like by virtue of full-two-dimensional gas chromatography-flame ionization detector (FID), and establishing a comprehensive evaluation method for crude oil mass fracture maturity on the basis of the principle that the relative contents of different types of molecular components in crude oil reflect different maturity evolution stages. The method, by virtue of the full-two-dimensional gas chromatography, can achieve simultaneous quantitative analysis on crude oil full-mass fracture content, and the method can be used for evaluating the crude oil maturity by virtue of crude oil mass fracture, so as to guarantee the accuracy and the contrasting property of the crude oil maturity evaluation.

The invention provides a system and a method for measuring the content of 57 volatile organic compounds in ambient air. The system comprises a four-way valve, a gas chromatograph and a three-stage cold trap preconcentrator; the four ports of the four-way valve are respectively connected with a pre-separation column, a first secondary separation column, a second secondary separation column and a helium gas source; and the gas chromatograph is provided with a flame ionization detector and a mass spectrometry detector. The method comprises the following steps: (1) preparing a mixed standard use gas; (2) preparing an internal standard use gas; (3) collecting an ambient air sample; (4) establishing a standard curve of a target component; and (5) taking the ambient air sample to be tested, removing interfering substances through the three-stage cold trap preconcentrator, performing gas chromatography-mass spectrometry analysis in the mass spectrometry detector after focusing is performed, obtaining the content of each component according to a peak area and the standard curve established in the step (4), and calculating the concentration of the sample to be tested according to a sample injection volume of the sample to be tested. By adopting the method provided by the invention, the simultaneous analysis of two detectors is achieved by once sample injection, thereby avoiding the influence of the interfering substances on the measurement result simply and effectively.

A micro counter-current flame detector is provided that is both sensitive for photometric and ionization detection for gas chromatography (GC). In the detector, a stainless steel capillary (0.01″ i.d.) supplying oxygen functions as a burner, which supports a compact flame that burns in a counter-flowing excess of hydrogen. In the “micro Flame Photometric Detector” (μFPD) response mode, the background emission level is reduced by over an order of magnitude compared to previous experiments using a fused silica capillary burner, resulting in greatly improved detection limits. The device can successfully operate as both a selective and universal GC detector. Results indicate that this micro counter-current flame method yields comparable performance to conventional Flame Photometric and Flame Ionization Detectors.

A temperature programmed module for use in a gas chromatograph. The module has micropacked column and inner and outer jacket tubes. The inner jacket tube surrounds the column to provide a space between the that tube and the column. The outer jacket tube surrounds the inner jacket tube to provide a space between the two jacket tubes. Air which has a controlled temperature flows only in the space between the two jacket tubes when it is desired to heat the column. Air flows in both spaces when it is not desired to heat the column. The temperature of the air is controlled. The module along with the sample injection valve and flame ionization detector are in an enclosure that is not temperature controlled. The air that flows in both spaces also flows in the enclosure to keep the heat from the valve and the flame ionization detector from heating the column.

The invention belongs to tobacco field, especially relating to a method for measuring phthalic acid ester (PAE) in water-based adhesive for tobacco. The method comprises the following steps: extracting phthalic acid ester (PAE) in water-based adhesive for tobacco by acetone, measuring by gas chromatography, using HP-5 or an equivalent chromatographic column, using a flame ionization detector (FID) and taking benzyl benzoate as an internal standard substance. The method for measuring phthalic acid ester (PAE) in water-based adhesive for tobacco provided by the invention is accurate in measurement, simple in operation, high in sensitivity and good in repeatability, which is applicable to carrying out qualitative and quantitative measurement on phthalic acid ester (PAE) in water-based adhesive for tobacco for technicists in enterprises of tobacco field and tobacco bonding adhesive and fills up the technical gap in the field.

The invention relates to a comprehensive two-dimensional gas chromatography method for quantitatively determining diamondoid hydrocarbons in petroleum sample. The method comprises the steps of (1) preparing to-be-detected sample; (2) analyzing the to-be-detected sample with comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry (GC*GC-TOFMS) to obtain peak information of diamondoid hydrocarbons in the to-be-detected sample; (3) analyzing the to-be-detected sample with comprehensive two-dimensional gas chromatography-hydrogen flame ionization detector (GC*GC-FID) to obtain GC*GC-FID spectrogram of the to-be-detected sample; according to the peak information obtained in step (2), determining peak positions of diamondoid hydrocarbons and D16-adamantane in the GC*GC-FID spectrogram, and obtaining their peak area integration results; and (5) calculating according to internal standard method to obtain quantitative results of diamondoid hydrocarbons. The method is suitable for quantitative determination of diamondoid hydrocarbons in all crude oil and rock extract samples.

The invention relates to a field gas chromatograph with flame ionization for the analysis of a gaseous mixture of hydrocarbons, extracted, in particular, from oil drilling mud. Said mixture consists of a fraction of heavy hydrocarbons (beyond pentane) dissolved in mud in gaseous form. Said field gas chromatograph is made up of two independent analysis circuits, dephased by half a cycle and synchronised one with the other. Said analysis circuits are comprised of at least one sampling cell in a preferred design layout, at least one capillary separation chromatography column, at least one flame ionization detector, and at least one electrometer for the conversion of an electrical current, collected by the flame ionization detector, into a voltage signal describing a chromatogram.

Improved operating modes of a micro counter-current flame ionization detector (μFID) are demonstrated. By operating the flame inside the end of a capillary gas chromatography (GC) column, the effective cell volume enclosing the flame is considerably reduced and results in significantly lower gas flows being required to produce optimal sensitivity from the stable flame. In a post-column μFID arrangement, a very lean flame is now situated on the end of a stainless steel capillary delivering 10 mL / min of hydrogen, which is opposed by a counter-current flow of only 20 mL / min of oxygen. The μFID detection limit obtained in this stable, oxygen-rich counter-current flame mode is 7×10−11 gC / s with a response that is linear over 6 orders of magnitude. These findings are comparable to those of a conventional FID. Overall, the results indicate that the low-flow sensitive μFID operating modes presented demonstrate that this detector may be potentially useful for further adaptation to portable devices and related GC applications.

An on-line chromatographic analysis system of gas-solid phase oxidizing reaction product comprises sample inlet and outlet, two carrier airflow pipelines four pieces of chromatographic columns, heat conduction detector and hydrogen flame ionization detector. It is featured as connecting said system to two sets of different reaction units and setting two six-way valves and one ten-way valve in said system for switching over these valves to realize separation and detection of multicomposition.

The invention discloses a total hydrocarbon tester having the on-line attenuation function. The tester comprises a sampling pipe, a pump, a hydrogen flame ionization detector, a compressed air bottle and a mixed gas chamber. An input end of the mixed gas chamber is connected with the sampling pipe, the other input end of the mixed gas chamber is connected with an air pipe, and the air pipe is connected with the compressed air bottle and provided with an air flow control device. The output end o the mixed gas chamber is connected with the pump through a mixed gas flow control device, and the pump is connected with the hydrogen flame ionization detector. Sample gas enters the mixed gas chamber, is mixed with clean air and reaches the hydrogen flame ionization detector under the action of the pump, and the hydrocarbon content of the sample gas is tested. The mixed gas flow control device and the air flow control device cooperate to control the proportion of the sample gas to the clean air, and the on-line attenuation function is achieved. By means of the total hydrocarbon tester, the concentration of hydrocarbon in the sample gas entering the hydrogen flame ionization detector is lowered in a quantitative mode, and shutdown of the tester due to overload or insufficient oxygen in the sample gas or other reasons is avoided.

The invention discloses a headspace gas chromatography method for determining the residual quantity of an organic solvent in a glycine bulk drug. The method is implemented under conditions that a DB-624 capillary column and a hydrogen flame ionization detector are used, sample inlet temperature is 150 DEG C, the detector temperature is 250 DEG C, high purity nitrogen is taken as carrier gas with flow rate being 2.2 mL / min, the split ratio is 10:1, headspace heating temperature is 80 DEG C, and equilibrium time is 35 min; besides, glycine is easily soluble in water and the 12 solvents are soluble in water to a certain degree, so that an aqueous solvent is adopted. The method can be used for simultaneously determining the residual quantity of the 12 organic solvents including methanol, ethanol, acetone, isopropanol, acetonitrile, dichloromethane, n-propanol, ethyl acetate, tetrahydrofuran, cyclohexane, n-butanol and toluene in the glycine bulk drug, has the characteristics of being easyto operate, quick, sensitive and accurate in result, and provides reference for effectively controlling the quality of the glycine raw material and ensuring medication safety.

The invention relates to a gas chromatography measuring method of the content of nicotine, myosmine, anabasine, neonicotine and conitine in a tobacco juice of an electronic cigarette. The method is characterized by comprising the following steps: preparing a sample solution to be measured by using an ultrasonic extraction method and compounding a mixed standard working solution with a level-7 concentration gradient; performing analysis by utilizing a gas chromatograph matched with a hydrogen flame ionization detector; and performing quantification by using a double internal standard method. The result shows that the nicotine, the myosmine, the anabasine, the neonicotine and the conitine in respective linearity ranges are good in linear relationships (R2 is greater than 0.998), wherein the limit of detection (LOD) ranges from 3.66mu g / g to 17.8mu g / g; the average recovery rate of three standard adding levels is between 97.1% and 104.6%; the relative standard deviation (RSD) is below 3.86%. Thus, the method is high in sensitivity and good in repeatability and recovery rate.

The invention discloses a process for determining residual monomers in an adhesive. The process which adopts headspace gas chromatography concretely comprises the following steps: sampling through a headspace sample injector, separating through a DB-VRX chromatographic column or a chromatographic column with corresponding properties of the DB-VRX chromatographic column, detecting through a hydrogen flame ionization detector, and quantifying through an external standard method. The invention provides the process for determining residual monomers in the adhesive, and the process which has the advantages of accurate test, simple operation, high efficiency, rapidness, high precision and strong practicality is suitable for technicists in enterprises for producing tobaccos, buildings and adhesives to carry out qualitative and quantitative determination on the residual monomers of methyl methacrylate, ethyl methacrylate, methyl methacrylate, methyl acrylate, ethyl acrylate, butyl acrylate, and vinyl acetate. Above technical field is improved to avoid harms of consumer bodies caused by the excess residual monomers.

A portable gas analyzer comprising an integrated micro-flame ionization detector (micro-FID), a micro-gas chromatograph (micro-GC), an electrolyzer, and a flame-shaped electrode are provided. The components of the portable gas analyzer can be integrated into a single “lunchbox” sized housing with all the peripherals required to operate the micro-GC / FID without an external power and gas supply.

The invention provides a method for simultaneously determining the content of 1,2-propylene glycol, menthol, diethylene glycol, glycerin and triethylene glycol in electronic cigarette juice. The method is characterized by comprising the following steps: preparing a sample solution to be tested by adopting an ultrasonic extraction method and a mixed standard working solution with the 7-grade concentration gradient, analyzing by using a gas chromatograph provided with a hydrogen flame ionization detector, and quantifying by using an internal standard method. Results show that when the concentration of the 1,2- propylene glycol, the menthol, the diethylene glycol, the glycerin and the triethylene glycol is in the range of 0.001-1.0mg / mL, the linear relationship among the 1,2-propylene glycol, the menthol, the diethylene glycol, the glycerin and the triethylene glycol is good (R<2> is greater than 0.999), the limit of detection (LOD) is 0.0028-0.0057%, the average recovery rate of thee labeling levels is in the range of 94.8%-104.4%, and the relative standard deviation (DSR) is less than 4.96%, and according to the method, the sensitivity is high in sensitivity, and repeatability and recovery rate are good.

The invention relates to a method for testing the contents of residual monomers in an acrylate pressure sensitive adhesive by virtue of gas chromatography, in particular relating to a method for testing the contents of residual monomers in an acrylate pressure sensitive adhesive by virtue of gas chromatography. An FID (flame ionization detector) hydrogen flame detector is adopted; ultrapure nitrogen is used as a carrier gas; and ultrapure hydrogen and drying air are used as auxiliary gases. The chromatographic column is TM-FFAP 30m*0.32m*0.5 micron; the carrier gas flow is 10mL / min; the temperature of a vaporizing chamber is 180 DEG C.; the temperature of the detector is 275 DEG C.; and the column temperature uses a program warming way. In the method, a separation analysis method of residual monomers in the acrylate pressure sensitive adhesive is built, and the interferences of other substances in the actual acrylate pressure sensitive adhesive are removed by a solvent extraction method; and the method is especially suitable for measuring the contents of the residual monomers in the acrylate pressure sensitive adhesive compounded by a plurality of monomers, and has the characteristics of fast speed, reliability, convenience in operation, high selectivity and high sensitivity.

The invention relates to a seabed shallow-layer gas detection method based on the MIP-CPT technology. According to the invention, a conventional CPTU probe is additionally provided with an MIP module, thereby enabling organic matters in a ground layer to be continuously decomposed along with the probe and to be diffused through a semi-permeable MIP film during exploration operation when CPTU data is obtained. Then, the organic matters are conveyed to a gas chromatograph on a mother ship, and are detected by a photo ionization detector, a flame ionization detector and a dry-type electrolysis electrical conductivity detector in the gas chromatograph. Testing parameters are obtained through analysis, and the phase state and content condition of organic matters in the ground layer are obtained.

The invention provides a new technology for simultaneously detecting prohibited substances such as ethylene glycol and diethylene glycol, and functional component menthol in toothpaste by an internal standard method through a gas chromatograph. The method is characterized by comprising the following steps of: adopting an Agilent DB-624 chromatographic column, taking helium as carrier gas, using a flame ionization detector, taking 1,4-butanediol as internal standard substance; and split sampling. Samples are subjected to methanol extraction and ultrasonic oscillation treatment, then stewing, taking a supernatant fluid and filtering by a filtering film with 0.45mu.m, and the filtrate is the sampling solution. Retention time of the sample is used for qualitative analysis, and quantitative analysis is carried out according to a peak area ratio of each component to the internal standard substance. The method has the advantages of high sensitivity, high reproducibility, high selectivity, and strong specificity; the processing method of the samples is simple; through the internal standard method, the analysis error is further reduced; and the method is suitable for qualitatively and quantitatively analyzing ethylene glycol, diethylene glycol and menthol in the toothpaste.

The present invention relates to a method for analyzing N2O, CO, CH4 and CO2 in atmosphere with one injection by gas chromatography. According to the method, a carrier gas with the purity less than 10-5% passes through a purifier under the output pressure of 0.20-0.60 Mpa, such that the purity of the purified carrier gas is less than 10-6% or 10-7%; the purified carrier gas is introduced into a chromatographic column loaded with a sample requiring detection in a gas chromatograph, after an adsorption effect and a desorption effect, N2O, CO, CH4 and CO2 in the sample requiring detection sequentially enter an electron capture detector, a methane converter and a hydrogen flame ionization detector perform detections at the temperature of 90-350 DEG C; finally the data from the electron capture detector and the hydrogen flame ionization detector are concurrently input to a chromatographic work station in the gas chromatograph to obtain the analysis result chromatogram. The method of the present invention is simple, and is easy to operate. With the method of the present invention, the data accuracy error can be effectively reduced, and the sample measurement period can be shortened.

The invention discloses a method for simultaneously measuring content of nicotine, 1,2-propylene glycol and glycerol in electronic smoke sol. The method comprises the following steps: smoking electronic cigarettes by utilizing a smoking machine provided with a switch connection device, trapping the nicotine, 1,2-propylene glycol and glycerol in the gas sol by adopting a Cambridge filter, by taking an isopropyl alcohol solution added with an interior label as an extraction agent, extracting the nicotine on the filter by using an oscillation extraction method, analyzing by matching a gas chromatograph with a hydrogen flame ionization detector, and performing internal standard method determination. The method disclosed by the invention has the advantages that the efficiency of the adopted measurement method is high, the switch connection device is high in air impermeability, simple and effective, a linear relation among the nicotine, 1,2-propylene glycol and glycerol is good in the respective linearity range, the detection limit is 0.40-2.16ug / mL, the average recovery rate of three labeling levels is between 96.0 and 102.0 percent, and the relative standard deviation is smaller than 3.60 percent. Therefore, the method is high in sensitivity and high in repeatability and recovery rate.

The invention discloses an on-line analysis system and a method for performing on-line measurement by using the system. The analysis system comprises a ten-way valve (5) which is provided with at least ten interfaces, two six-way valves (10, 17) which are provided with at least six interfaces respectively, four chromatographic columns (7, 8, 11, 20), quantitative tubes (4, 15), a thermal conductivity detector (14) and a flame ionization detector (21).

The invention relates to a small-size hydrogen flame ionization detector. The detector is characterized in that a left port and a right port of a four-way component are respectively an air inlet and a leading-out micro current signal wire outlet, a leading-out micro current signal wire passes through a pressure cap which blocks the signal wire outlet; a metal collector is fixed in a four-way longitudinal through hole by a heat-resisting insulating sleeve A which is arranged at the inner side of an upper port in the longitudinal direction of the four-way component, and is closely laminated with the upper port of the four-way component; the upper end of the metal collector is closely laminated with the inner side wall of the heat-resisting insulating sleeve A, and the lower end thereof is suspended at the inner side of a lower port in the longitudinal direction of the four-way component; the lower end of the four-way component is fixedly connected with a two-way component; and a nozzle is fixedly connected at one end of a leading pipe which is externally sheathed with a heat-resisting insulating sleeve B, and is sheathed on the inner wall of the two-way component by the heat-resisting insulating sleeve B so as to lead the nozzle to extend into the two-way component. The small-size hydrogen flame ionization detector has simple integral structure, convenient assembly and disassembly, little gas consumption amount, low energy consumption, and equal sensitivity with an FID detector with the conventional size.

A gas chromatographic method for determining a residual solvent in a phthalide compound takes cyanopropyl phenyl-dimethyl polysilicone as a stationary liquid capillary chromatographic column, hydrogenas a flame ionization detector and nitrogen as a carrier gas and calculates content of the residual solvent in peak area according to an external standard process. The method can determine normal heptane and other residual solvents in the phthalide compound and has the advantages of high sensitivity, strong specificity and high accuracy.

The invention relates to a method for determining volatile components in substances like polyvinyl alcohol resin, which adopts a full-evaporation headspace gas chromatography for analyzing and includes the following steps: sealing 0.1g-0.5g polyvinyl alcohol resin in a 20ml headspace bottle, placing the bottle in a headspace sample injector, heating at temperature of 115 DEG C to 125 DEG C for 85min to 95min to lead the volatile components to be evaporated totally, adopting gas chromatography for analyzing, recording a spectrogram of the volatile components, and calculating content of the volatile components through a standard regression curve. The analysis condition is that: adopting a DB-1 type chromatographic column, adopting a flame ionization detector (FID) detector with the column temperature at 40 DEG C, the detector temperature at 200 DEG C and the sampler temperature at 150 DEG C. The method is good in data repeatability and accurate and reliable in data analysis and has the advantages of being easy and convenient to operate, fast in analysis and high in sensitivity, and the volatile components in samples are good in separation effect.

The invention discloses a gas chromatograph and a detection method for determining the content of impurities in hydrogen. The gas chromatograph comprises several pneumatic valves, and each pneumatic valve is provided with a corresponding quantitative loop, a carrier gas pipeline and a chromatographic column; each pneumatic valve and the corresponding quantitative ring are connected in series through a sample gas pipeline; the quantitative rings are filled with sample gas, the pneumatic valves are communicated with the corresponding quantitative rings, the carrier gas pipelines and the chromatographic columns to form independent analysis channels through the switching of the pneumatic valves, and the chromatographic columns are connected with the thermal conductivity detector or the flame ionization detector for analysis according to the properties of target components. According to the detection method disclosed by the invention, multiple impurities in the sample can be simultaneouslydetected in the same instrument through one-time sample injection, so the sample consumption, the detection time and the detection cost are saved, the difference of analysis results of different components caused by environmental change and instrument debugging errors is eliminated, and the analysis uniformity and accuracy are improved. The detection accuracy is further improved by optimizing carrier gas composition and setting a standard substance as a control group.

A component analyzer for a hydrocarbon gas mixture with oxygen compounds includes two sample tubes that are connected in series, wherein the first sample tube (13) is connected with a permanent gas and methane detecting system; the system includes a CO2 cutting column (5), a CO2 separating column (6), a permanent gas separating column (7) and a thermal conductivity detector (18) that are sequentially connected in series; a second pipeline connected with the thermal conductivity detector (18) is arranged behind the CO2 separating column (6); the second sample tube (14) is connected with a hydrocarbon and oxygen component detecting system; the system includes a split sampling opening (15), a polar capillary column (8), a hydrocarbon separating capillary column (9) and a first hydrogen flame ionization detector (17) that are sequentially connected in series; and another pipeline connected with a second hydrogen flame ionization detector (16) is arranged behind the polar capillary column (8). The component analyzer can complete component analysis of the mixed multiple gas mixture with the oxygen compounds within C6.

A supplemental air system for a portable, intrinsically safe (IS), flame ionization detector (FID) device includes a portable, intrinsically safe, FID device and a supplemental air system coupled to the FID device configured to store compressed air and deliver a flow of regulated air to the FID device as needed.

The invention relates to a gas chromatography detection method used for detecting power transformer oil, adopting an analyzing system with one time sampling, parallel double columns, one time shunt and simultaneous detection of two detectors. An auxiliary loading gas way is added in a gas loading inlet pipe of a detection system. The regulation is implemented according to the air flow of a main loading gas way, the air flow of the auxiliary loading gas way and a needle valve which is added on the auxiliary loading gas way in a compulsory shunting way. Thus, a detected sample is shunted into two chromatographic columns which are connected with the main loading gas way and the auxiliary loading gas way in parallel for analyzing hydrocarbon compositions and H2, CO and CO2 compositions to finish the composition analysis of the transformer oil. A nickel reformer which can control temperature is added on the gas way after the chromatographic column separation of the auxiliary loading gas way and the detection of a thermal conducting detector. The auxiliary loading gas way and the main loading gas way reformed by the nickel reformer together enter a flame ionization detector through a tee for the detection. A hydrogen pipe from a hydrogen inlet to the left end inlet of the reformer in the auxiliary loading gas way is connected in parallel with a hydrogen pipe from an original hydrogen inlet to the flame ionization detector.