44 results about "Flame ionization detector" patented technology

The invention discloses a portable gas chromatographic peak automatic identification and integration method. According to the method, filtering processing is carried out on the obtained hydrogen flame ionization detector signal based on wavelet transform, a smooth curve is reconstructed, and a peak searching threshold value is dynamically adjusted by using a dynamic threshold value method based on the hydrogen flame ionization detector signal. And carrying out peak searching processing on the smooth curve based on the determined peak searching threshold. And carrying out secondary screening adjustment on the preliminary peak searching result, and calculating the chromatographic peak area. And finally, performing chromatographic peak matching according to the target compound retention time set by a user, and converting the peak area of each matched chromatographic peak into concentration according to the calibration curve information. According to the invention, the dynamic self-adaption of the detection threshold is realized, so that the detection threshold can adapt to chromatographic signals with different signal-to-noise ratio levels.

The invention discloses a Hankel singular value decomposition-based magnetic resonance spectrum water peak modeling and post-processing method. The method comprises the following steps of: acquiring original multi-channel FID (Flame Ionization Detector) signals by a PRESS sequence; combining multi-channel signals, and performing frequency correction and eddy current correction; reconstructing and deducting a time domain water peak model, and executing exponential filtering processing; and performing baseline correction by adopting an asymmetric least square method to obtain a final spectrogram. Accurate modeling and removal of residual water peaks are realized by utilizing Hankel structure matrix singular value decomposition, adaptive baseline correction is performed by introducing an asymmetric least square method, interference of the residual water peaks is effectively reduced, the baseline smoothness of a spectrogram and the distinguishability of metabolic peaks are improved, and the method can be used for realizing accurate modeling and removal of the residual water peaks under the condition of not depending on additional modulation of a collection end or increasing of sequence complexity. The time domain signals are subjected to structured matrix decomposition to realize accurate modeling and removal of residual water peaks, the signal-to-noise ratio and metabolic peak resolution of the spectrogram are remarkably improved, the operation is stable, the robustness is high, and the obtained final MRS spectrogram can meet clinical requirements.

The invention provides a gas chromatographic analysis method of maleic anhydride, and belongs to the technical field of maleic anhydride analysis methods. As a maleic anhydride sample to be detected contains acidic substances and has a low response value on an FID (Flame Ionization Detector), according to the method provided by the invention, the BSTFA reagent is adopted for esterification treatment, the response value of the acidic substances in the sample to be detected is increased, a weak-polarity chromatographic column is adopted for gas chromatographic analysis, a hydrogen flame detector is used for detection, and an external standard method is used for quantitative calculation. The method provided by the invention has the advantages of high accuracy of the obtained detection result, good data repeatability and high sensitivity, can accurately analyze the maleic anhydride component concentration, has important guiding significance for quality control of maleic anhydride products produced by a device, and has good popularization and application values.

The present invention relates to a method of operating a flame ionization detector comprising providing a hydrogen containing fuel gas, providing an oxygen containing oxidizing gas, burning the fuel gas with the oxidizing gas to produce a flame, providing a sample gas to the flame to produce an at least partially ionized sample gas, wherein the sample gas contains at least one organic compound and a carrier gas, and measuring a current induced by the at least partially ionized sample gas in an electrode of the flame ionization detector. It is provided that the oxidizing gas comprises oxygen in an amount of 50 to 90 vol % of the oxidizing gas and helium in an amount of at least 10 vol % of the oxidizing gas. An arrangement comprising a flame ionization detector and a gas mixture for use in a flame ionization detector are also part of the invention.

1. Name of the designed product: hydrogen flame ionization detector. 2. Use of the designed product: for quantitative analysis of organic compounds capable of burning ionization in flame. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view.

This invention discloses a non-methane total hydrocarbon dilution detection device and its detection method, relating to the field of waste gas detection technology. The device includes a sampling pipeline, a return pipeline, a diversion valve, a collection pump, an air pipeline, a mixing pipeline, an electromagnetic multi-way valve, and a flame ionization detector (FID). The electromagnetic multi-way valve is connected to a gas storage valve. A first sensor and a second sensor within the gas storage valve are communicatively connected to the electromagnetic multi-way valve. Remaining mixed gas can be temporarily stored in the gas storage valve. The fullness or deficiency of the mixed gas in the gas storage valve is detected by the first and second sensors. Under the pressure of the floating pressure control module, the mixed gas maintains a certain pressure, which helps to push the mixed gas back into the FID for detection. This improves upon the problem in existing technologies where the amount of mixed gas allowed to enter the FID detector is limited, preventing the utilization of excess mixed gas and resulting in low energy efficiency.

The invention discloses a system and a method for measuring the content of each hydrocarbon in shale, and belongs to the technical field of petroleum geological exploration. The invention firstly discloses a system for measuring the content of each hydrocarbon in shale, a sample tank is connected with a reversing valve, and the reversing valve is sequentially connected with a sample inlet, a cold trap, a separation column and a first hydrogen flame ionization detector to form a gas path for detecting the content of each hydrocarbon; the reversing valve is sequentially connected with the sample inlet, the cold trap, the total content column and the second hydrogen flame ionization detector to form a total hydrocarbon content detection gas path; the invention further discloses a method for measuring the content of each hydrocarbon in shale by using the system. According to the method, two hydrogen flame ionization detectors are combined to determine the total hydrocarbon content and the content of each hydrocarbon component in the sample in parallel, and finally, the absolute content of each hydrocarbon component can be directly obtained. In addition, the ball milling tank is adopted, so that the sample is always kept in a closed state in the crushing and testing processes, and the light hydrocarbon retention capacity is remarkably improved.

The invention relates to the field of analytical chemistry, and particularly discloses a method for determining residual solvents N, N-dimethylformamide, dichloromethane, isopropanol, ethyl acetate, methyl tert-butyl ether, ethanol, acetone, tetrahydrofuran and ethylene glycol dimethyl ether in a litamilast raw material by adopting a headspace-gas chromatography method, and a method for determining residual solvents N, N-dimethylformamide, dichloromethane, isopropanol, ethyl acetate, methyl tert-butyl ether, ethanol, acetone, tetrahydrofuran and ethylene glycol dimethyl ether in a litamilast raw material by adopting a headspace-gas chromatography method. The method comprises the following steps of: detecting by using a capillary column with 6 percent of cyanopropyl phenyl-94 percent of dimethyl polysiloxane as a stationary liquid through headspace sample introduction gas chromatography and a flame ionization detector (FID). According to the method disclosed by the invention, nine residual solvents contained in the litamilast raw material can be completely separated in one system, the separation degree is greater than 1.5, the specificity is good, interference from blank solvents and other unknown impurities is avoided, the sensitivity is high, the detection accuracy is high, and the quality of litamilast can be effectively controlled.

A jig for a pellicle storage container, a pellicle storage body, and a pellicle, wherein the amount of release of an organic gas having 20 or less carbon atoms as evaluated under the following condition 1 is 150 [mu] g or less per 1 g of the jig. Condition 1: 1 g of the cut-off piece of the clamp is arranged in a container as a test object, 200 ml of hexane is used as an extraction solvent, and an extraction solution is obtained by a Soxhlet extraction method for 6 hours in a water bath at 80 DEG C. And analyzing the obtained extracting solution by using gas chromatography. In gas chromatography, a flame ionization detector is used as a detector, the amount of components having 20 or less carbon atoms is detected, and the total amount of the detected components having 20 or less carbon atoms is used as the outgas amount.

The invention discloses a sensitivity compensation device for a hydrogen flame ionization detector, and belongs to the technical field of hydrogen flame ionization detection.The sensitivity compensation device comprises a detector shell, a gas outlet pipe is installed on the lower side of the detector shell in a penetrating mode, a polarization electrode is fixedly installed at the upper end of the gas outlet pipe, and an igniter is installed at the position, corresponding to the polarization electrode, of the outer wall of the upper side of the gas outlet pipe; a collecting electrode is installed on the upper side in the detector shell, a carbon removal assembly is installed in the gas outlet pipe and used for removing carbon deposition in the polarization electrode, a storage cavity is formed in the upper side in the polarization electrode, thermal expansion liquid is contained in the storage cavity, and a first communication groove is formed in one side of the lower end of the storage cavity; according to the present invention, with the carbon removing assembly, the carbon deposition on the inner wall of the polarization electrode can be removed during the hydrogen flame ionization detection, such that the influence on the detection result of the detector due to the non-alignment of the flame and the collector position caused by the change of the flame shape during the combustion due to the accumulation of the residue at the gas outlet of the polarization electrode during the incomplete combustion can be avoided.

The present application relates to the technical field of drug quality detection, and particularly relates to a rapid detection method for organic solvent residues in drugs. By collecting organic solvent residue parameter information of target drugs in a historical period, a comprehensive score benchmark containing the types and concentration weighted fusion is determined; based on the comprehensive score and statistical determination, the stability risk of a gas chromatography device is determined; if there is a risk, the first and second heating rates of the chromatography effluent are extracted, and the effectiveness of the chromatography effluent of the target drug is determined in combination with the peak shape index output by the hydrogen flame ionization detector; the heating rate direction and value are adjusted respectively for different peak shape abnormalities. The present application realizes active monitoring of device stability and self-adaptive correction of the heating rate, and overcomes the problem of low detection accuracy of organic solvent residues in drugs.

An ignition aid method and apparatus for a flame ionization detector, comprising a body that traverses a chimney of the detector to create turbulence in flow of gases flowing out of the detector to enhance commingling of the fuel / air mixture with an ignition source when the ignition source is active.

The invention relates to the technical field of analytical chemistry, in particular to a gas chromatographic analysis method of benzimidazole compounds, and a hydrogen flame ionization detector is used in the gas chromatographic analysis method. The capillary chromatographic column is a high-film-thickness capillary chromatographic column; the structural formula of the benzimidazole compound is shown in the specification, wherein A, B, C and D are respectively and independently selected from H, C1-C10 saturated alkyl and C1-C10 alkoxy. And the film thickness of the high-film-thickness capillary chromatographic column is 1-5 [mu] m. The gas chromatographic analysis method disclosed by the invention has the advantages of strong specificity, high sensitivity, good reproducibility, no need of derivatization pretreatment of a sample, longer service life of a selected chromatographic column, wider application range, low analysis cost, high separation degree and good reproducibility, and the problem that a benzimidazole compound test method is single is solved. The technical blank of analyzing and identifying the benzimidazole compounds by a gas chromatographic analysis technology is filled.

The invention discloses a method for extracting 2, 3-butanediol and glycerol in fermented grains and determining the content of 2, 3-butanediol and glycerol, and relates to the technical field of white spirit detection. The method comprises the following steps: preparing a blank matrix highly simulating real fermented grains through an enzymolysis process; an isopropanol-n-hexane mixed solvent is adopted to selectively extract a fermented grain sample, co-extraction of impurities such as pigments is effectively reduced, and purification is carried out in combination with a dispersive solid-phase extraction technology; formulating a standard curve using the simulated matrix to correct matrix effects; and finally, performing quantitative analysis through a gas chromatography-hydrogen flame ionization detector. The method thoroughly avoids the problems of complicated operation, toxicity, harm and the like of a traditional derivatization method, overcomes the defects of serious impurity interference and remarkable matrix effect in the prior art through an innovative pretreatment and matrix matching strategy, has the advantages of simplicity and convenience in operation, good selectivity, high accuracy and good repeatability, and has a wide application prospect. The method is suitable for rapid and accurate detection of fermented grains of white spirit with different flavors.

The utility model provides an integrated automatic gas chromatograph and relates to the technical field of separation and analysis instruments. Comprising a shell and a main body structure arranged in the shell, and the main body structure comprises a sample feeding module, a reaction module, a gas feeding module, an analysis module and a control module; the sample feeding module comprises a multi-way valve, and the multi-way valve is provided with a carrier gas inlet, a to-be-detected gas inlet and a sample gas outlet communicated with the reaction module; the reaction module comprises a reaction chamber and a flame ionization detector which are sequentially arranged along the flow direction of the sample gas; an inlet of the reaction chamber is communicated with a sample gas outlet of the multi-way valve, an outlet of the reaction chamber is communicated with the flame ionization detector, and a chromatographic column is arranged in the reaction chamber; the analysis module comprises a gas analysis unit; and the gas analysis unit is electrically connected with the flame ionization detector through a signal line. On the basis, the gas chromatograph solves the problem that the existing gas chromatograph has defects in the aspects of integrated layout of internal core components and automation control collaboration.

The utility model discloses an electronic pressure flow controller and a non-methane total hydrocarbon detection device, the electronic pressure flow controller is respectively connected with a hydrogen / air supply device and a flame ionization (FID) detector, the electronic pressure flow controller comprises a proportional-integral (PI) control circuit, and the PI control circuit comprises an error comparator, a signal processing circuit and a signal processing circuit, the processor is used for receiving an actual measurement value detected by the sensor and calculating a difference value between a set value and the actual measurement value; a proportional-integral (PI) controller which generates an adjustment signal based on the received difference value; and the power amplifier is used for amplifying the received output electric signal into a strong current signal and adjusting the gas flow based on the strong current signal to control the ratio of the hydrogen to the air. According to the scheme, hydrogen and air parameters are accurately adjusted through the proportion-integral controller, the air flow is automatically reduced during ignition, the preset proportion is recovered after ignition succeeds, it is ensured that high-concentration organic matter is completely ionized, flame dilution is avoided, the ionization efficiency and the detection sensitivity are improved, and stable and reliable signals are provided.

The invention discloses a method for measuring refrigerant ratio by gas chromatography, and belongs to the technical field of refrigerant gas chromatographic analysis. According to the technical scheme, a sampling steel cylinder is used for sampling, a double-valve type steel cylinder or a single-valve type steel cylinder is used for preparing a standard sample, a gas chromatographic method is used for determining the content of R404 series and R507 series refrigerants in a matching mode, chromatographic columns are aluminum oxide capillary columns, detectors are hydrogen flame ionization detectors, and the gas chromatographic method is used for determining the content of R404 series refrigerants and R507 series refrigerants in a matching mode. The used carrier gas is high-purity nitrogen. According to the invention, the defects existing in the existing use standard detection are overcome, and the same gas chromatograph can detect R404 series refrigerants and analyze R507 series refrigerants on the basis of setting parameters, so that accurate detection is realized.

The utility model provides a system for detecting and analyzing total carbon content in hydrogen containing chlorosilane gas, which relates to the technical field of detection of total carbon content in hydrogen containing chlorosilane gas, and comprises a ten-way valve, a quantitative loop, a first chromatographic column, a second chromatographic column, a converter and an FID (Flame Ionization Detector), the ten-way valve is provided with ten ports; an inlet and an outlet of the quantitative ring are communicated with the ten-way valve; an inlet and an outlet at one end of the first chromatographic column are communicated with the ten-way valve; an inlet in one end of the second chromatographic column is communicated with the ten-way valve; an inlet in one end of the converter is communicated with an outlet of the second chromatographic column; and an inlet at one end of the FID detector is communicated with an outlet of the converter. The system can be used for detecting and analyzing the total carbon content in the recycle hydrogen, and the influence of chlorosilane on the detection and analysis device is avoided when the recycle hydrogen is detected and analyzed.

The embodiment of the specification discloses a kind of automobile carbon can escape emission pollutant detection systems.The system includes micro closed chamber, hydrogen flame ionization detector, fourier transform infrared spectrometer and controller, controller is configured in the initial moment corresponding to test instruction acquisition first test data, first test data includes the first temperature, first pressure, first hydrocarbon pollutant concentration and first methanol concentration of micro closed chamber;Controller is also configured in the first time after the first preset time length of initial moment, second test data is collected, and second test data includes the second temperature, second pressure, second hydrocarbon pollutant concentration and second methanol concentration of micro closed chamber;Controller is also configured to calculate the carbon can escape emission amount at the first time.In the embodiment, the precise quantitative detection of methanol fuel automobile pollutant emission during carbon can escape test can be realized, and the reliability of carbon can escape test is improved.

The invention relates to the technical field of detection and analysis, in particular to a method for determining the component content of an epoxypropane reactor sample by a gas chromatography external standard method, which comprises the following steps: carrying out physical separation pretreatment on a gas-liquid two-phase sample in a sampling steel cylinder at an outlet of an epoxypropane reactor; a gas chromatograph provided with a hydrogen flame ionization detector is adopted, under specified chromatographic conditions, a proper amount of samples are injected into a chromatographic system, a standard curve is established through an external standard method, and the content of each component is calculated. The method can rapidly and accurately determine the content of each component of the epoxypropane reactor sample, is high in accuracy and precision, and provides accurate data support for optimization of process parameters. By optimizing collaborative matching of a gas-liquid two-phase separation pretreatment process and chromatographic analysis conditions, the problems of poor separation effect, poor repeatability and the like in an epoxypropane reactor outlet sample analysis process are solved.

The utility model relates to a kind of FID-SCD series detection device, belong to gas-liquid detection field.The device is fixed with hydrogen flame ionization detector and sulfur chemiluminescence detector on the same side by support, is connected by means of stopper and current limiter.The stopper is the "convex" cylinder, metal top plate is provided with central through-hole and air hole, FID nozzle is centrally installed;Current limiter uses the quartz or ceramic insulating tube with inner diameter ≤0.35mm, length 17.5cm±0.1, one end is connected SCD gas inlet, the other end passes through through-hole and FID nozzle maintains 9-10mm interval, outer surface is coated with polytetrafluoroethylene coating.Sample is separated after chromatographic column, FID completes hydrocarbon detection, sulfur combustion product passes through current limiter and enters SCD to realize sulfur content quantitative analysis.The utility model has the advantages that: carbon sulfur data can be obtained simultaneously by one sample, reduce interference, improve analysis efficiency, applicable to petrochemical, environmental monitoring and other fields.

The invention provides an intelligent self-adaptive flame ionization detector which comprises an instrument, an ionization part and a pretreatment part are mounted on the instrument, the ionization part is used for detecting sample airflow, and the pretreatment part is used for pretreating the sample airflow; a gas path unit is mounted on the instrument and is used for injecting a sample gas flow into the pretreatment part, and then the sample gas flow is injected into the ionization part for ionization. The gas path unit quantitatively injects the sample gas into the pretreatment part, then injects the sample gas into the ionization part, preheats the sample gas through the pretreatment part, and then injects the sample gas into the ionization part for subsequent ionization, and meanwhile, the ionization part can heat the sample gas, so that a double-temperature-zone structure is formed; due to the double-temperature-zone independent temperature control design, differential precise adaptation of different boiling range components is achieved, and the technical bottleneck that all-component analysis cannot be considered in a traditional single-temperature-zone'compromise temperature 'is broken through.

This invention discloses a method and system for measuring volatile organic compounds (VOCs) in exhaust gas from stationary pollution sources. The method includes determining the sampling locations and points for exhaust gas emissions from stationary pollution sources; collecting data on the main product outputs and main raw material or fuel consumption of a pre-defined enterprise and establishing a database; collecting exhaust gas using an exhaust gas sampling device; obtaining exhaust gas chromatography using a mass spectrometer; obtaining low molecular weight components using a flame ionization detector (FID) to obtain VOC components; dividing the low molecular weight components into different concentration series and performing gas chromatography analysis to plot working curves; calculating the correlation coefficients between the low molecular weight components and the response area for different concentration series; analyzing other compounds using a mass spectrometer; calculating the correlation coefficients between other compounds and the response area; calculating the concentration of VOCs; establishing pollution source data based on the database; and performing regression analysis using the database and the VOC concentrations to output the results.

The invention discloses a system for analyzing the component content of a decomposition product of sulfur hexafluoride gas or sulfur hexafluoride / nitrogen mixed insulating gas in electrical equipment and a use method of the system, and belongs to the field of gas chromatography detection. In particular to an analysis system for the component content of a decomposition product of sulfur hexafluoride gas or sulfur hexafluoride / nitrogen mixed insulating gas in electrical equipment and a use method of the analysis system. The invention aims to solve the technical problem that the existing electrical equipment insulating gas decomposition product component detection system cannot comprehensively identify the types of decomposition products of SF6 gas or SF6 / N2 mixed insulating gas. According to the invention, the analytical column, the conductivity detector, the hydrogen flame ionization detector and the flame photometric detector are designed, so that analysis and detection of trace components of gas can be realized; the device can effectively detect multiple components of decomposition products of SF6 gas and SF6 / N2 mixed insulating gas, is high in accuracy and sensitivity, and is low in cost, quick and efficient compared with a helium ionization detection system.

The application belongs to the technical field of analysis and detection, and particularly relates to a gas chromatography detection method of roxifurine, which adopts gas chromatography to detect roxifurine samples, wherein the stationary liquid of the chromatographic column is 5% diphenyl-95% dimethyl polysiloxane; and the detector is a hydrogen flame ionization detector. The detection method has strong specificity, good stability, good separation effect of roxifurine and impurities, and can meet the detection requirements and quality control of roxifurine.

The invention relates to the field of analytical chemistry, and particularly discloses a gas chromatographic analysis method of trifluoroacetic acid and application of the gas chromatographic analysis method. The method aims to solve the problems of inaccurate trifluoroacetic acid content analysis result and poor reproducibility caused by interference of associated volatile strong acid impurities in a sample in the prior art. The method comprises the following steps: directly sucking a trifluoroacetic acid sample to be detected by using a microinjection needle, injecting the trifluoroacetic acid sample into a gas chromatograph equipped with a hydrogen flame ionization detector for analysis, and calculating the mass percentage content of trifluoroacetic acid by adopting an area normalization method. The core of the method is that a special capillary chromatographic column with ON-TFA as a stationary phase is adopted, and the sample size, the carrier gas flow, the temperature of a sample inlet and specific temperature programming conditions are controlled. According to the method, complex sample pretreatment is not needed, trifluoroacetic acid and impurities can be effectively separated, rapid, direct, high-accuracy and high-reproducibility quantitative analysis is achieved, and the method is suitable for production quality control, purity identification and solvent recovery of trifluoroacetic acid products.

Invention Title: A Method for Detecting Ethylene Glycol and Diethylene Glycol in Aripiprazole Oral Solution Abstract: This invention provides a method for detecting ethylene glycol and diethylene glycol in aripiprazole oral solution, applicable to the field of drug oral preparation detection technology, especially in the field of pharmaceutical quality control, requiring gas chromatography detection methods to monitor pharmaceutical excipients and byproducts. This analytical method overcomes the limitations of ethylene glycol and diethylene glycol, which lack ultraviolet absorption methods. The sample solution is injected into the injection port via a microsyringe, and instantly vaporized in a high-temperature vaporization chamber, increasing sensitivity and accuracy, and solving the problems of low detection efficiency and low precision. Separation and detection efficiency are improved by optimizing column temperature and other conditions. This invention uses high-performance gas chromatography (HPLC) with a 100% bonded cross-linked polyethylene glycol (PEG) capillary column, a flame ionization detector, nitrogen as the carrier gas, and an organic solvent as the diluent. It uses a conventional chromatographic column, an automated injection method, and reduces costs. Gradient temperature elution is employed for separation and detection. This invention relates to a method for the detection of ethylene glycol and diethylene glycol in aripiprazole oral solution. This method has good separation, high specificity, high precision, and good repeatability, and meets the requirements for methodological research on the determination of ethylene glycol and diethylene glycol in aripiprazole oral solution.

The invention relates to the technical field of chemical analysis, in particular to a gas phase detection method of 3-amino-4 '-nitrodiphenyl ether, which is characterized by comprising the following steps: S1, preparation of standard solutions: taking a 3-amino-4'-nitrodiphenyl ether standard substance, and preparing a series of standard solutions with different concentrations by using acetonitrile; preparing a sample solution: taking a 3-amino-4 '-nitrodiphenyl ether sample, and preparing the sample solution by using a solvent acetonitrile; s2, performing gas chromatography detection on the standard solution and the sample solution according to the following gas chromatography conditions: a detector is a hydrogen flame ionization detector; a chromatographic column is a high-temperature chromatographic column; column temperature: temperature programming; the temperature of a sample inlet is 280-300 DEG C; the temperature of a detector is 300 DEG C to 310 DEG C; the split ratio is (80-100): 1. The detection method has the advantages of stable base line, no trailing, good peak pattern, low instrument operation cost, simple and convenient detection process and good repeatability.

The present application relates to the technical field of chemical analysis, in particular to a gas phase detection method of 3-amino-4'-nitro diphenyl ether, characterized in that the detection method comprises the following steps: S1, preparation of standard solution: taking 3-amino-4'-nitro diphenyl ether standard product, and preparing a series of standard solutions with different concentrations by using acetonitrile; sample solution preparation: taking 3-amino-4'-nitro diphenyl ether sample, and preparing sample solution by using solvent acetonitrile; S2, gas chromatography detection of standard solution and sample solution according to the following gas chromatography conditions: detector: hydrogen flame ionization detector; chromatographic column: high-temperature chromatographic column; column temperature: programmed temperature; injection port temperature: 280-300 DEG C; detector temperature: 300-310 DEG C; split ratio: (80-100):1. The detection method has the advantages of smooth baseline, no tailing, good peak shape, low instrument operation cost, simple and convenient detection process, and good repeatability.

The invention discloses a method for measuring the content of p-phenylene diisocyanate, which comprises the following steps of: vaporizing a sample under a selected chromatographic condition by adopting a gas chromatography, separating by using a chromatographic column, detecting by using a hydrogen flame ionization detector, and quantitatively calculating the mass percentage content of the p-phenylene diisocyanate in the sample by using an area normalization method, the sample contains p-phenylene diisocyanate, temperature programming is adopted for separation, the initial temperature of a chromatographic column is set to be 60-100 DEG C, a third-order heating process is performed, the first-order heating is that the temperature is raised to 140-180 DEG C at the rate of 15-25 DEG C / min and stays for 0-3 min, the second-order heating is that the temperature is raised to 190-260 DEG C at the rate of 6-15 DEG C / min and stays for 0-3 min, and the third-order heating is that the temperature is raised to 270-300 DEG C at the rate of 20-40 DEG C / min and stays for 2-8 min. According to the determination method provided by the invention, the content of the p-phenylene diisocyanate can be rapidly, conveniently and accurately measured without pollution, nondestructive detection is realized, the sample preparation is simple, and the operation is safe.