193 results about "Ionic chromatography" patented technology

The invention discloses an ion chromatography wave crest boundary extraction method based on fitting residual and tangent judgment, and belongs to the technical field of ion chromatography analysis. Comprising the following steps: S1, reading an original waveform data sequence, and executing frequency reduction sampling according to a set step length; s2, calculating the slope of the data after underclocking sampling by using a difference method, and searching positive and negative slope sections by performing first-order derivation on the waveform after underclocking sampling; s3, noise interference is eliminated, slope areas are grouped, then a chromatographic peak detection limit value is set, and an effective peak left section and an effective peak right section are screened out; s4, combining the effective wave crest left side section and the effective wave crest right side section to obtain an effective wave crest and a preliminary left boundary point and a preliminary right boundary point of the effective wave crest; s5, fitting a straight line through the preliminary left boundary point and the preliminary right boundary point to position an error integral region; and S6, updating the optimal boundary point by traversing the evaluation indexes of all points in the error integral region. The boundary search range is more accurate, and the calculation efficiency is higher.

The invention belongs to the technical field of radioactive metal isotope ion chromatographic separation, and discloses a medical radioactive isotope purification multichannel ion liquid chromatography system. The system comprises an automatic sample injection system, a parallel sampling and leaching channel, a parallel multi-column chromatographic structure, an online radiation dose monitoring module, a multi-channel tail end detection system, a recycling structure and a central control system. By adopting a full-automatic sample injection and multi-channel parallel chromatography structure, parallel separation, real-time radiation monitoring, multi-mode online detection and closed-loop recovery are realized, and the problems of insufficient nuclear purity, low separation efficiency, low target recovery rate and high radiation exposure of a traditional method are solved.

The utility model provides a system for measuring trace hydrogen chloride in hydrogen, the system comprises a drainage module, an absorption module and an analysis module, the drainage module can stably lead out the hydrogen to be detected from a main pipeline, the sampling is accurately controlled, and the accuracy and safety of the sampling are ensured; the absorption module can rapidly absorb hydrogen chloride in hydrogen to form liquid to be detected, the absorption process is stable and reliable, and the accuracy of subsequent analysis is ensured; the analysis module comprises a standard liquid storage unit and an ion chromatography unit, the formed to-be-detected liquid and standard liquid can be accurately analyzed, the ion chromatography unit can accurately measure the concentration of trace hydrogen chloride, and the reliability and accuracy of a detection result are ensured.

The application discloses a dilution pretreatment detector for ion chromatography detection of underground water and a method thereof, and relates to the technical field of water quality detection.The detector comprises a supporting shell, a dilution liquid storage cylinder is arranged in the supporting shell, an underground water storage cylinder is arranged in one side of the supporting shell, and a stirring dilution cylinder is connected to the bottom of the underground water storage cylinder and the dilution liquid storage cylinder.A series of structures are arranged, which can effectively avoid impurities from accumulating in the filter screen and the cylinder, greatly improve the impurity removal rate, provide high-purity samples for subsequent ion chromatography detection, reduce the risk of pipeline blockage and instrument damage, ensure that the sample concentration after dilution fully meets the ion chromatography detection requirements, significantly improve the accuracy and stability of the detection results, greatly improve the continuity and work efficiency of the underground water sample pretreatment, adapt to batch sample detection requirements, facilitate deep maintenance and component replacement, shorten equipment maintenance time, and reduce use and maintenance costs.

The invention relates to the technical field of analytical chemistry, in particular to an ion chromatography method for separation and detection of acetate, nitrite and nitrate ions in a complex matrix culture medium. The method mainly solves the problems of insufficient separation degree, serious matrix interference, poor detection precision and reproducibility and the like when the conventional ion chromatography technology is used for detecting a complex matrix culture medium.

The application relates to the technical field of analytical chemistry detection, and specifically discloses a rare earth ion chromatographic online analysis and detection method and system, which adopts a chromatography-mass spectrometry combined system, realizes multi-scale time-frequency decomposition of signals by constructing an adaptive wavelet base function library, accurately identifies and classifies interference types in combination with a convolutional neural network and vacuum degree coupling analysis; a U-Net generator with an attention mechanism and a multi-scale discriminator are designed for signal repair aiming at repairable interference; a state transition model containing a mass-to-charge ratio database is established, empirical mode decomposition and adaptive filtering technology are used to realize dynamic calibration of a mass axis; quantitative accuracy is ensured through double internal standard correction and a triple verification mechanism; when unrepairable interference is detected, a hierarchical self-checking program is started, and fault diagnosis is carried out in combination with spectrum fingerprint analysis.

An electrolytic device for an ion chromatography system includes a first electrolyte reservoir including a first electrolyte solution and a first electrode; an eluent generation chamber including a second electrode; and a first ion exchange connector coupling the eluent generation chamber to the first electrolyte reservoir. The first ion exchange connector including one or more first ion exchange membranes allowing passage of counter ions with a first charge but excluding ions with an opposite charge. The electrolytic device further includes a second electrolyte reservoir including a second electrolyte solution and a third electrode; a trap chamber including a fourth electrode; and a second ion exchange connector coupling the trap chamber to the second electrolyte reservoir. The second ion exchange connector including one or more second ion exchange membranes. The second ion exchange membranes excluding ions of the first charge but allowing passage of contaminant ions of the opposite charge.

The invention discloses a method for detecting phosphate impurities, namely diethyl phosphoacetic acid and diethyl phosphate, in afatinib, and establishes a simple and sensitive ion chromatography detection method based on the hydrolysis property of a phosphate compound under an alkaline condition. Sodium hydroxide or potassium hydroxide solution-water is used as a mobile phase for isocratic or gradient elution, and a conductivity detector is used for detection. According to the present invention, the accurate quantification of the impurities in the afatinib is achieved, the detection speed is fast, the cost is low, the operation is simple, and the good specificity, the sensitivity, the precision and the accuracy are provided, such that the product quality of the afatinib maleate bulk drug synthesized by using the diethyl phosphoacetic acid as the starting material and the related preparation can be further ensured.

The invention relates to the technical field of hyaluronic acid solution detection, and particularly discloses a method for detecting a buffer solution in a sodium hyaluronate solution, and the method is reliable in content detection, low in detection difficulty and easy to operate. A cationic standard series solution is obtained; preparing a plurality of anion standard solutions with different concentrations and containing chloride ions and phosphate ions to obtain a series of anion standard solutions; pretreating the sodium hyaluronate solution to be detected to obtain a sample to be detected; carrying out ion chromatography detection on the cation standard series solution, the anion standard series solution and the sample through an anion and cation exchange chromatographic column by adopting an ion chromatography method, drawing a standard curve according to a chromatogram, and calculating a linear regression equation of the standard curve; and according to the chromatographic peak area of each ion in the sample and the corresponding linear regression equation, calculating the concentration of the corresponding ion and the content of the corresponding buffer solution.

The embodiment of the present disclosure provides a concentration analysis method for ultra-low concentration of acidic gas in background atmosphere, which is applied to the technical field of atmospheric environment monitoring and meteorological observation. The method comprises the following steps: selecting at least two suitable blank filter membranes according to the chemical properties of the target acidic gas; arranging the blank filter membranes in the sampling device of the atmospheric background station in a preset serial order for continuous sampling; performing extraction treatment on the sampled filter membranes respectively, and using an ion chromatograph to quantitatively detect the target ion concentration in the extraction liquid, and converting the mass of the corresponding acidic gas; based on the flow monitoring data during sampling, calculating the total sampling volume through a conversion equation, and combining the mass of the acidic gas to calculate the concentration value of the target acidic gas. In this way, the problems of low enrichment efficiency, high detection limit and invalidation of online instruments due to concentration lower than the detection limit of the traditional method can be solved, and accurate capture and quantification of ultra-low concentration of acidic gas in background atmosphere are realized.

The application discloses a process for separating and purifying a mixed solution of HCl and NaCl by using a chromatographic technique. Liquid containing HCl and NaCl is loaded into a chromatographic column containing an anion exchange resin, adsorbed, washed, desorbed, and the effluent is collected. The application uses acid retardation and ion exchange mechanism, adopts fixed bed technology, and realizes the purpose of removing NaCl and separating and purifying high-concentration HCl in one step. The whole process does not use acid and alkali, the Na content in the product liquid is lower than the ion chromatography detection limit, the yield of HCl reaches more than 95%, and the average concentration reaches more than 50%. + The application also uses ultrapure water as a desorbent, so that the product elution and resin regeneration are completed at the same time, and the process is simplified.

This invention provides a biomass-derived phenol composition with suppressed acidic odor. [Solution] A phenol composition containing biomass-derived phenol (A), wherein the peak height percentage corresponding to propionic acid in total ion chromatography by GC-MS after pretreatment by 150°C headspace method is 0.35% or less.

The invention provides a solvent-free organic-inorganic hybrid resin composition. The solvent-free organic-inorganic hybrid resin composition can provide a member having a high elastic modulus. The solvent-free organic-inorganic hybrid resin composition comprises the following components (A)-(C), and a resin film having self-supporting properties can be obtained after firing at 230 DEG C or lower. (A) silica particles having an average primary particle diameter of 15-100 nm and a sulfate ion content of 30 ppm or less, as calculated by formula 1 below, adhering to the silica particles; particle-attached sulfate ions (ppm) = combustion ion chromatography (ppm)-free ion chromatography (ppm) (formula 1); (B) an epoxy resin having two or more epoxy groups and having a number average molecular weight of 150-3000 (inclusive); and (C) a curing agent.

The utility model discloses a device for automatically adjusting the gas treatment amount of an adsorption tower on line, relates to the technical field of polycrystalline silicon production, and mainly aims to monitor the content of Cl <-> in hydrogen treated by the adsorption tower on line and realize automatic adjustment of an outlet adjusting valve of the hydrogen adsorption tower. According to the main technical scheme, the device for automatically adjusting the gas treatment amount of the adsorption tower on line comprises a reaction chamber, a gas inlet pipe and an ion chromatograph, the upper end of one side of the reaction chamber is connected to a discharge pipe, a filler layer is arranged in the reaction chamber, and the liquid level in the reaction chamber is located above the filler layer; one end of the gas inlet pipe is connected to the adsorption tower outlet pipe, the other end of the gas inlet pipe penetrates through the top wall of the other side of the reaction chamber and is connected to the bubbling pipe, the bubbling pipe is located below the filler layer, and a plurality of through holes are uniformly distributed in the pipe wall of the bubbling pipe; the detection end of the ion chromatograph extends into the liquid above the filler layer, and the ion chromatograph and the adsorption tower outlet regulating valve are in interlocking control.

One embodiment of a fluororesin analysis device according to the present invention is a device that analyzes a fluororesin contained in a sample, and comprises: a measurement unit (1) that is a Py-CG / MS device; a chromatogram creation unit (222) that creates, from data collected using measurements performed on a target sample by the measurement unit, an EIC for fluorocarbon-derived fragment ions that are generated from thermal decomposition and has a specific m / z value; and an assessment unit (223, 224) that assesses whether a fluororesin is present by determining whether peak emergence has periodicity with respect to the retention time in the EIC. As a result, it can be assessed whether a sample contains a fluororesin even if there is no database for identifying the fluororesin.

1. Name of the design product: ion chromatograph. 2. Use of the design product: analytical instrument for ion chromatography. 3. Design points of the design product: combination of shape and pattern. 4. Picture or photo best indicating the design points: perspective view.

The utility model relates to an optical device which is used for carrying out ion chromatography detection on a sample and comprises a light source part which provides light with a preset wavelength range so as to form a first light beam propagating in a free space; and a flow cell provided with a guide channel, the guide channel containing the sample and provided with a first lens and a second lens, the first lens having a first clear aperture and the second lens having a second clear aperture; the ratio of the first clear aperture to the second clear aperture ranges from 1 to 3, and the ratio of the equivalent light spot size of the focusing part to the second clear aperture is not larger than 0.5, so that the ratio of the light intensity of the third light beam to the light intensity of the first light beam is not smaller than 62%. According to the device, efficient focused light beams are generated in the flow cell, and the intensity ratio of emergent light to incident light is increased, so that the light utilization efficiency is improved, and the sample detection sensitivity is improved. In addition, the utility model also relates to an analysis device.

Embodiments described herein relate to analysis of chromatography data. A system can comprise a memory that stores, and a processor that executes, computer executable components. The computer executable components can comprise a comparing component, of an analytical model, that executes a comparison, of a target characteristic of a target analyte to a first known characteristic of a first known analyte, the first known characteristic comprising a deviation relative to a second known characteristic of a second known analyte, and an identifying component, of the analytical model, that executes an identification, of the target analyte, corresponding to a target peak of a target chromatogram, which target chromatogram corresponds to target analyte chromatography data, based on the comparison.

The invention discloses a method for detecting sialic acid in a dairy product. The method comprises the following steps: pretreating raw materials: weighing a uniformly mixed liquid dairy product, adding water for diluting, adding a precipitant consisting of potassium ferrocyanide and zinc acetate, uniformly shaking, adding water for fixing the volume, uniformly shaking, and filtering with a filter membrane of 0.5 mu m or less to obtain a filtrate; the concentration of the liquid dairy product is 1-10g / 100mL, the concentration of the potassium ferrocyanide is 0.1-0.26 g / 100mL, and the concentration of the zinc acetate is 0.2-0.55 g / 100mL after the water is added to a constant volume; a chromatographic column is a hydrogen type cation chromatographic column, a 0.005-0.01 mol / L sulfuric acid aqueous solution is used as an eluent for isocratic elution, and after elution, a PAD detector is adopted for detection under the detection wavelength of 210-220 nm. The method is suitable for detecting sialic acid in milk, and has the advantages of simple sample treatment, low treatment cost and accurate detection.

The utility model belongs to the technical field of ion chromatographs, and particularly relates to an ion chromatograph capable of automatically feeding samples, which comprises an ion chromatograph component, and a sample loading component is detachably mounted at the plane end of the ion chromatograph component; the ion chromatograph assembly comprises a machine room and an ion chromatograph main body installed in the machine room, vertical cabins are installed at the rear positions of the top of the machine room, the liquid inlet end of the ion chromatograph main body is located in the vertical cabins, and a liquid pumping pipe is arranged at the liquid inlet end of the ion chromatograph main body. According to the ion chromatograph capable of automatically injecting the sample, a plurality of test tubes can be mounted on the sample loading assembly to realize alternation of the plurality of test tubes, and samples in the test tubes are pumped through the liquid pumping tube and are fed into the ion chromatograph main body for detection, so that automatic sample injection operation is realized, and the working efficiency of the ion chromatograph is favorably improved; when a sample in the test tube is extracted, the liquid extraction tube penetrates into the test tube and continues to extract the sample through the sample pump, so that the liquid extraction tube can effectively and sufficiently extract the sample.

The invention relates to the technical field of flux component determination, in particular to a method for determining the content of calcium fluoride in flux for corrosion-resisting steel through ion chromatography. The invention discloses a method for measuring the content of calcium fluoride in welding flux for corrosion-resisting steel through ion chromatography. The method comprises the following steps: S100, preparing a sample to be measured; s200, pretreating a to-be-detected sample, and preparing a diluted filtrate; s300, setting working parameters of the ion chromatograph; s400, calibrating an instrument, and determining by adopting an ion chromatograph; and S500, measuring the calcium fluoride content of the to-be-measured sample. The method for determining the content of calcium fluoride in the flux for corrosion-resisting steel through ion chromatography has the advantage that the welding quality is guaranteed. And the welding flux does not need to be subjected to experimental detection before welding, so that the welding flux is saved.

The invention discloses a cationic chromatographic filler preparation method based on RAFT (reversible addition-fragmentation chain transfer) polymerization, which comprises the following steps: synthesizing monodisperse linear polystyrene microsphere seeds by adopting a dispersion polymerization method, synthesizing polystyrene-divinyl benzene microspheres with high crosslinking degree by adopting a single-step seed swelling method, carrying out reversible addition-fragmentation chain transfer polymerization, and carrying out column packing by adopting a homogenization method. Compared with the traditional free radical polymerization, the preparation method not only retains the multifunctionality of the traditional free radical polymerization, but also solves the problem that the traditional free radical polymerization cannot well control the molecular weight and macromolecular structure, and is simple in process, convenient to operate and suitable for industrial production. The method has a potential application prospect in specific challenges of chromatographic separation and biomacromolecule separation.

The utility model relates to detection equipment for continuous sample introduction of electronic gas absorption liquid. The detection equipment comprises an ion chromatograph, a peristaltic pump and at least one group of sample introduction components, each group of sample introduction assembly comprises a plurality of gas absorption bottles, a cleaning bottle and a first switching valve, the first switching valve is provided with a plurality of first liquid inlets and a first liquid outlet, the gas absorption bottles and the cleaning bottle are respectively communicated with the corresponding first liquid inlets, the first liquid outlet is communicated with the ion chromatograph, and the first liquid inlet is communicated with the ion chromatograph; a peristaltic pump for providing power for liquid feeding of the ion chromatograph is arranged on an output pipeline of the ion chromatograph; the detection equipment disclosed by the utility model adopts a simple and low-cost structure to replace an existing automatic sampler, and a high-cost long-time nitrogen protection mode is not needed; under the condition of ensuring that the samples are not in contact with the external environment, automatic and continuous sample injection of a plurality of samples is realized, and the accuracy of ultra-trace detection of anions and cations in the electronic gas absorption liquid can be ensured in a specific detection scene aiming at the electronic gas absorption liquid.

The utility model discloses an ion chromatograph for organic halogen detection, which relates to the field of chromatographic instruments, and adopts the technical scheme that the ion chromatograph comprises a chromatographic instrument main body and a sample inlet arranged on the chromatographic instrument main body, a connecting frame is fixedly mounted on the outer side wall, close to the sample inlet, of the chromatographic instrument main body through an abutting part, and a containing cavity is formed in the top of the connecting frame. An injector filled with liquid to be detected is placed in the containing cavity, the needle head part of the injector is embedded into the sample inlet, the cylinder part of the injector is clamped and installed through the clamping assembly, meanwhile, the plunger rod part of the injector is close to the sample feeding mechanism, then the sample feeding mechanism is moved in the direction close to the chromatographic instrument body, and the injector is clamped and installed through the clamping assembly. According to the invention, the liquid in the injector can be pushed into the chromatograph main body at a constant speed until the sample feeding mechanism pushes and presses the plunger rod part of the injector, so that the liquid injection process of the injector is controlled, the injector does not need to be manually pushed and injected, and the energy of an operator when the injector is pushed and injected can be saved.

The present application provides a method for determining extractable organic fluorine in textiles by online combustion-ion chromatography system, and relates to the technical field of textile detection. The method specifically comprises the following steps: weighing the textile, immersing the textile in an organic solvent, then performing ultrasonic extraction to obtain an extraction solution; cooling and concentrating the extraction solution, using the same organic solvent to make up the volume to obtain a sample solution; adding n-hexanol to the sample solution for solvent replacement to obtain a test solution; burning the test solution under rich-oxygen high-temperature hydrolysis conditions, using pure water to absorb the generated gas to obtain an absorption solution; using an ion chromatograph to determine the content of fluorine ions in a fluorine ion standard working solution and the absorption solution respectively, drawing a standard working curve, and quantitatively calculating the content of extractable organic fluorine in the textile by external standard method. The method is verified by various textiles, and has good robustness; the loss of volatile substances and background pollution are effectively reduced, and the stability and accuracy of detection are improved.

The invention provides a solvent-free organic-inorganic hybrid resin composition. The solvent-free organic-inorganic hybrid resin composition can provide a member having a high elastic modulus. The solvent-free organic-inorganic hybrid resin composition comprises the following components (A)-(C), and can obtain a self-supporting resin film after being fired at 230 DEG C or lower. (A) silica particles having an average primary particle diameter of 15-100 nm, and sulfate ions adhering to the silica particles as calculated by formula 1 below being 30 ppm or less; particle-attached sulfate ion (ppm) = combustion ion chromatography (ppm)-free ion chromatography (ppm) (Formula 1); (B) an epoxy resin having two or more epoxy groups and having a number average molecular weight of 150-3000 (inclusive); and (C) a curing agent.

An ion chromatogram of a gas component generated by heating the phenolic resin foam at 600 DEG C is obtained by gas chromatography-mass spectrometry. The area ratio Z (Z = X / Y) of the total X (X = A + B + C) of the area A of the dihydroxybenzene derived from the pyrolysis product, the area B of the dihydroxytoluene derived from the pyrolysis product, and the area C of the dihydroxyxylene derived from the pyrolysis product to the area Y of the pyrolysis product representing the structure derived from urea crosslinking is within the range of formula (1). The phenolic resin foam has a thermal conductivity of 0.0240 W / (m.K) or less in an environment of 23 DEG C. 0.035 < = Z < = 0.715 (1)

The invention discloses an airless methane sulfonic acid leacheate generator for liquid phase ion chromatography, which comprises a shell, a first heterogeneous anion exchange membrane, a first homogeneous anion exchange membrane, a second heterogeneous anion exchange membrane, anion exchange resin, a bipolar membrane, a third heterogeneous anion exchange membrane, a second homogeneous anion exchange membrane and a fourth heterogeneous anion exchange membrane are sequentially arranged in the shell, a cathode chamber is formed between one side, far away from the first homogeneous anion exchange membrane, of the first heterogeneous anion exchange membrane and the inner wall of the shell, an anode chamber is formed between one side, far away from the second homogeneous anion exchange membrane, of the fourth heterogeneous anion exchange membrane and the inner wall of the shell, and a cathode plate is arranged in the cathode chamber; an anode plate is arranged in the anode chamber, the anode plate and the cathode plate are connected with a power supply, the generator can generate the airless methane sulfonic acid leacheate for liquid phase ion chromatography, and the generator is simple in structure and small in size.

To provide a rubber composition for tires exhibiting excellent wet performance, rolling performance and dry performance, and to provide a tire produced by using the composition.SOLUTION: A rubber composition for a tire, comprising 100 parts by mass of rubber components including 30 parts by mass or more of SBR, 10 to 300 parts by mass of silica, C1, and C2, wherein C1 has an aromatic proton ratio of 20% or more and the following parameter S is 300 or more, C2 has an aromatic proton ratio of 1 to 15% and S is 200 or less, and a total content of C1 and C2 with respect to a content of SBR is 1 to 100% by mass: Kn represents the retention factor of the n-th peak from the smallest retention time in the total ion chromatogram obtained by pyrolysis gas chromatography-mass spectrometry of the resin, α represents the n of the peak of the maximum retention factor satisfying kn ≤ 6.0, and An represents the ratio (%) of the area of the n-th peak to the total area of the peaks satisfying kn ≤ 6.0.SELECTED DRAWING: None