104 results about "Flame ionization detector" patented technology

The invention relates to a method for simultaneously detecting three related substances in an olpinapone starting material. According to the detection method, the three related substances in an opinapone starting material are simultaneously detected by using a gas chromatographic method of a hydrogen flame ionization detector. According to the detection method, the problem that three related substances cannot be detected simultaneously due to weak ultraviolet absorption and large difference under the liquid chromatography condition can be solved, the matrix effect generated by an opiapone starting material under the gas chromatography condition can be eliminated, the condition that the separation degree of the three related substances is poor is improved, and the detection accuracy is improved while the detection efficiency is improved. And the true and reliable quality of the initial material of the olpinapone is also ensured. The method can be used for simultaneously and quantitatively detecting three related substances higher than 0.02% in the initial material of the opinapone, and is high in sensitivity, good in separation degree, high in practicability and simple and rapid in detection process.

The invention relates to a method for detecting residual solvent benzene in a ziprasidone hydrochloride bulk drug. According to the detection method, dimethyl sulfoxide is used as a diluent, a 2.8 mol / L potassium hydroxide solution is used as a cosolvent, and a dimethyl sulfoxide solution of high-concentration ziprasidone hydrochloride can be completely dissolved under a high-temperature heating condition, so that the sensitivity of benzene meets the requirement; and detecting the benzene in the ziprasidone hydrochloride bulk drug by using a gas chromatograph (GC-FID headspace sampling) connected with a hydrogen flame ionization detector. The detection method can be used for quantitatively detecting benzene higher than 0.4 ppm in ziprasidone hydrochloride bulk drugs. The method is high in sensitivity and practicability, and the detection process is simple and rapid.

The invention relates to the technical field of novel material chemical analysis, and discloses a triphenyl phosphate purity standard substance valuing method, which comprises the following steps: filtering, drying, dissolving and sterilizing a triphenyl phosphate sample; a triphenyl phosphate sample is comprehensively analyzed from different angles by comprehensively applying a GC-MS (Gas Chromatography-Mass Spectrometry) technology, an NMR (Nuclear Magnetic Resonance) technology, an infrared spectroscopy, a gas chromatography-flame ionization detector method, a Karl Fischer method and an inductively coupled plasma mass spectrometry, and finally, the purity value of the triphenyl phosphate purity standard substance is calculated by a mass balance method. The method provides a scientific and accurate technical means for quality control and standard formulation of the triphenyl phosphate product, has important practical application value for related industries in the fields of chemical engineering and material science, and is beneficial for improving the product quality and promoting industrial upgrading.

The invention discloses a method and system for measuring and calculating volatile organic compounds in exhaust gas discharged by a stationary pollution source, and the method comprises the steps: determining a sampling position and a sampling point of the exhaust gas discharged by the stationary pollution source, collecting the main product yield, main raw material or fuel consumption of a preset enterprise, and building a database; the method comprises the following steps: collecting waste gas through a waste gas sampling device, acquiring a waste gas chromatogram by adopting a mass spectrum detector, acquiring low-molecular-weight components by adopting a flame ionization detector FID, and acquiring volatile organic components; dividing the molecular weight low components into different concentration series, performing gas chromatographic analysis, drawing a working curve, and calculating correlation coefficients of the molecular weight low components of different concentration series and response areas; analyzing other compounds by adopting a mass spectrometric detector, calculating correlation coefficients of other compounds and response areas, calculating the concentration of the volatile organic compounds, and establishing pollution source data according to the database; and carrying out regression analysis by utilizing the database and the volatile organic compound concentration, and outputting a result.

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 waste gas non-methane total hydrocarbon emission continuous monitoring system and method, and relates to the related technical field of environmental monitoring, and the system comprises: a connection collection device, which is used for extracting to-be-detected gas from a waste gas source; carrying out gas chromatographic separation, and determining separated components; detecting through a hydrogen flame ionization detector to generate an ion current, and converting the ion current to obtain a current signal; weak current analysis is carried out, and a concentration-signal relation is established through fitting; extracting real-time to-be-detected gas for passing treatment, and generating real-time concentration in combination with the concentration-signal relationship; and the real-time concentration is output through a monitoring interface. The technical problem that in the prior art, continuous monitoring is difficult to conduct to effectively extract and separate different pollutant components, and consequently the accuracy and timeliness of the emission monitoring result are insufficient is solved, and the technical effect of improving the accuracy and timeliness of the emission monitoring result is achieved.

The utility model discloses a wide-range laboratory universal type hydrogen flame ionization detector in the technical field of detectors, which comprises a shell, the interior of the shell is hollow, the interior of the shell is fixedly connected with an FID main body, the top end of the FID main body is fixedly connected with an FID nozzle head, and the outer wall of the bottom end of the FID main body is fixedly connected with a heating block main body. The top of the shell is fixedly connected with a collection shell, a collector is arranged in the collection shell, one end of the collection shell is fixedly connected with a high-voltage line in a penetrating manner, the top of the collection shell is fixedly connected with a top block, and an air outlet is formed in the outer wall of the top end of one end, close to the high-voltage line, of the top block in a penetrating manner; the outer wall of the end, away from the high air outlet, of the shell is fixedly connected with a connecting pipe. Through the overall design of the structure, the overall structure of the device is compact, meanwhile, the sensitivity of the detector is improved, the requirement for polarization voltage is low, the size is small, installation is convenient, durability is high, and the actual use effect of the detector is improved.

The utility model discloses an explosion-proof hydrogen flame ionization detector which comprises an explosion-proof shell, an ignition electrode, a collecting electrode and an electric field electrode, the explosion-proof shell comprises a detection cavity, one end of the detection cavity is provided with an air inlet, and the other end of the detection cavity is provided with an air outlet; the ignition electrode is detachably mounted on the explosion-proof shell; the collecting electrode is detachably mounted on the explosion-proof shell; the electric field electrode is detachably mounted on the explosion-proof shell; the ignition electrode, the collecting electrode and the electric field electrode are sequentially arranged from one end of the exhaust port to one end of the air inlet. The explosion-proof hydrogen flame ionization detector is small in size and light in weight, the electrode is convenient to maintain or replace after being damaged, and the use convenience is improved.

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.

Aspects of the present invention relate to a module (1000) for supplying hydrogen gas to a flame ionisation detector (3000). The module (1000) comprises a housing (100) configured to be mounted within a vehicle (5000), wherein the housing (100) comprises a gas flow system (1010). The gas flow system (1010) comprises a gas bottle (120) for containing hydrogen gas, wherein the gas bottle (120) is coupled within the housing (100). The gas flow system (1010) further comprises a pressure regulator (136) coupled to the gas bottle (120) configured to control a pressure of the hydrogen gas received from the gas bottle (120). The gas flow system (1010) further 10 comprises an output port (110) mounted through the housing (100) and coupled to the pressure regulator (136), the output port (110) configured to selectively couple to the flame ionisation detector (3000). In this way, the claimed invention provides a module (1000) for supplying hydrogen gas to a flame ionisation detector (3000) for hydrocarbon emissions testing onboard a vehicle (5000) that is robust and safe for inhabitants of the vehicle.

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.

The invention relates to the technical field of analytical chemistry, in particular to an analytical method of 1, 2, 3-tri (2-cyanoethoxy) propane, which adopts gas chromatography for detection, and adopts a hydrogen flame ionization detector as a detector; the capillary chromatographic column is a weak-polarity column or a medium-polarity column; the temperature of a hydrogen flame ionization detector is 300-350 DEG C; the temperature of a sample inlet is 200-250 DEG C; the column temperature of a capillary gas chromatographic column is firstly set to be 40-80 DEG C, the holding time is 5-10 min, then the temperature is increased to 250-300 DEG C at the speed of 10-15 DEG C / min, and the holding time is 20-30 min; the carrier gas is nitrogen or helium. The analysis method is low in operation cost, the chromatographic column has good thermal stability, the peak shape, the separation degree and the repeatability are better, the accuracy is higher, and the method has the characteristics of rapidness, simplicity, accuracy and the like.

The invention relates to a method for simultaneously detecting two organic silicon impurities in a ziprasidone hydrochloride intermediate product. According to the detection method, the two organic silicon impurities in the ziprasidone hydrochloride intermediate product are simultaneously detected by using a gas chromatographic method of a hydrogen flame ionization detector. The detection method not only can solve the problem that the two organic silicon impurities cannot be quantified without characteristic ultraviolet absorption under the condition of liquid chromatography, but also can control one of the organic silicon impurities not to be easily degraded and converted into the other organic silicon impurity under the condition of gas phase high temperature, thereby ensuring that the quality of the ziprasidone hydrochloride intermediate product is real and reliable. The method can be used for simultaneously and quantitatively detecting two organic silicon impurities higher than 0.02% in the ziprasidone hydrochloride intermediate product, and is high in sensitivity, good in separation degree, high in practicability and simple and rapid in detection process.

The invention discloses a method for detecting a zoledronic acid residual solvent. The method comprises the following steps: (1) respectively preparing a blank solution, a reference solution and a test solution; (2) sample injection detection; an instrument is a gas chromatograph with a hydrogen flame ionization detector, nitrogen is used as carrier gas, and the carrier gas is injected into the gas chromatograph by adopting headspace sample injection; and respectively carrying out sample injection detection to obtain a chromatogram of the reference substance solution and a chromatogram of the test solution, and carrying out detection analysis by adopting an external standard method to complete the determination of the zoledronic acid residual solvent. According to the method, the gas chromatograph is adopted to detect the residues of methanol, tetrahydrofuran, isopropanol and triethylamine in zoledronic acid, the detection chromatographic conditions are optimized in a targeted manner, and under the condition of ensuring good theoretical plate and separation degree, a plurality of residual solvents are placed in the same system for detection, so that the detection efficiency is greatly improved; and meanwhile, the detection chromatographic conditions are specifically optimized, so that the organic solvents are completely separated, and the linear relation is good in the investigated range.

The present invention provides a detection method for related substances of ethyl 4-bromobutyrate, and relates to the field of drug analysis. The method adopts a weak polar chromatographic column; nitrogen is used as a carrier gas, and the flow rate is 0.7-1.5 ml / min; injection is performed in split mode; a temperature control method of programmed heating is adopted, and the detector is a hydrogen flame ionization detector; gas chromatography is used to qualitatively or quantitatively detect related substances in ethyl 4-bromobutyrate. It has the characteristics of stable baseline, good peak shape, high separation, excellent specificity and system suitability, high sensitivity, and good durability, which makes up for the gap in the prior art, and is of great significance to the quality control of ethyl 4-bromobutyrate and the drug safety of elagolid sodium.

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.

An analysis system for hydrocarbon components in ultrapure ammonia. The analysis system comprises: a sample storage tank (1), an electronic refrigeration and concentration apparatus (7), a carrier gas apparatus (10) and a detection apparatus, wherein the electronic refrigeration and concentration apparatus (7) is connected to the sample storage tank (1), and the electronic refrigeration and concentration apparatus (7) is also connected to both the carrier gas apparatus (10) and the detection apparatus; and the detection apparatus comprises a chromatographic column (12) and a hydrogen flame ionization detector (13). The electronic refrigeration and concentration apparatus (7) refrigerates and concentrates samples, and on this basis, hydrocarbon components in ultrapure ammonia can be detected by means of the chromatographic column (12) and / or the hydrogen flame ionization detector (13), without the need for using a pulse discharge helium ionization detector, thereby reducing the costs of detecting hydrocarbon components in ultrapure ammonia.

The present invention includes a housing (2) including an internal space (3) to which a combustion gas is supplied, a nozzle (4) provided with an ejection port (18) at an upper end, the nozzle (4) being configured to eject a mixed gas of a sample gas and a combustion support gas from the ejection port (18) to form a hydrogen flame at the upper end, and a collector (8) having a hollow cylindrical shape and provided above the nozzle (4) with a central axis facing a vertical direction to collect components in the sample gas ionized by a hydrogen flame formed at the upper end of the nozzle (4), wherein the nozzle (4) is provided with a first tapered surface (22) at an upper end part, the first tapered surface (22) being inclined with a first taper angle (θ1), the first tapered surface (22) reducing an outer diameter of the nozzle (4) toward the upper end, and the collector (8) is provided with a second tapered surface (24) inside a lower end part, the second tapered surface (24) being inclined with a second taper angle (θ2) larger than the first taper angle (θ1), the second tapered surface (24) reducing an inner diameter of the collector (8) upward from a lower end.

Aspects of the present invention relate to a module (2000) for supplying gas to a flame ionisation detector (3000). The module (2000) comprises a housing (200) configured to be mounted within a vehicle (5000). The housing (200) comprising a gas flow system (2010), the gas flow system comprising a gas bottle (220) for containing gas, wherein the gas bottle (220) is rigidly coupled within the housing (200) via one or more mounting arms (222) extending from an interior wall of the housing (200). The gas flow system (2010) further comprises a two-stage pressure regulator (236) coupled to the gas bottle (220). The gas flow system (2010) further comprises an output port (210) mounted through the housing (200) and coupled to the two-stage pressure regulator (236). The output port (210) is configured to supply gas to a flame ionisation detector (3000). The two-stage pressure regulator (236) and the output port (210) are coupled together by first piping (237). The gas bottle (220) and the two-stage pressure regulator (236) are coupled together by second piping (234), wherein the second piping (234) comprises a tortuous path. The housing (200) further comprises a first dampener configured to suppress oscillations of the gas bottle (220) and the two-stage pressure regulator (236).

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 invention discloses a greenhouse gas analysis system and an analysis method thereof.The greenhouse gas analysis system comprises a sample injection system, a chromatographic column separation system and a detection system, the chromatographic column separation system comprises a first chromatographic column, a second chromatographic column, a third chromatographic column and a fourth chromatographic column, and the detection system comprises a hydrogen flame ionization detector, a thermal conductivity detector and an electron capture detector; the first chromatographic column, the second chromatographic column and the third chromatographic column are connected in parallel, the third chromatographic column and the fourth chromatographic column are connected in series, the first chromatographic column is connected with the hydrogen flame ionization detector, the second chromatographic column is connected with the electron capture detector, and the fourth chromatographic column is connected with the thermal conductivity detector; according to the invention, detection and analysis of fluorine-containing gases such as methane, carbon dioxide, nitrous oxide and sulfur hexafluoride are realized by using different detectors and different principles, chromatographic signal response is completed through the signal output system, and sample detection and analysis are realized through data analysis and calculation. And accurate and reliable quantity value traceability is provided for monitoring the change characteristics of the concentration of the greenhouse gas in the atmospheric environment.

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 discloses a method for detecting the content of hydrazine in a bile acid product, which adopts a gas chromatographic method to detect the content of hydrazine in the bile acid product, and the chromatographic conditions are as follows: a gas chromatograph adopts Shimadzu GC-2030; a chromatographic column is an SH-Wax capillary column, and the chromatographic column is 60.0 m * 0.25 mm * 0.5 [mu] m; the carrier gas is high-purity nitrogen; the flow velocity is 2.0 ml / min; the split ratio is 1: 1; the detector is a hydrogen flame ionization detector; the temperature of the detector is 220 DEG C; the temperature of a sample inlet is 200 DEG C; the headspace sampling amount is 5ml; the temperature rising procedure of the chromatographic column is as follows: from 80 DEG C, raising the temperature to 100 DEG C at the rate of raising the temperature by 10 DEG C per minute, retaining for 20 minutes, raising the temperature to 220 DEG C at the rate of raising the temperature by 20 DEG C per minute, and retaining for 17 minutes; the headspace temperature and time are set as follows: the box body temperature is 80 DEG C, the flow path temperature is 90 DEG C, the transmission line temperature is 100 DEG C, the circulation time is 65 minutes, and the sample preheating time is 60 minutes. The method can rapidly, accurately and effectively separate and measure the hydrazine content in the bile acid product, improves the detection efficiency, greatly reduces the detection cost, and is simple in operation process and strong in specificity.

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.