273 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 utility model relates to the technical field of ion chromatographs, in particular to a column oven of an ion chromatograph. A column oven of an ion chromatograph comprises a column oven structure and a column oven isothermal body arranged in the column oven structure, a chromatographic column and a temperature control assembly are arranged on the column oven isothermal body, a heat insulation structure matched with the column oven isothermal body is arranged in the column oven structure, and a valve assembly matched with the chromatographic column to form a passage is further arranged in the column oven structure. According to the utility model, by controlling and monitoring the temperature in the column box structure, the temperature can be accurately controlled and maintained in a proper range, so that the temperatures of the chromatographic column, the environment, the liquid and the like are consistent, and the reliability and the accuracy of an analysis test are ensured.

The invention relates to a carbon capture absorbent degradation performance evaluation method and a determination device, the method comprises the following steps: accelerating aging degradation of a to-be-detected sample under high pressure oxygen and heating conditions, simulating the oxidation process of an absorbent in long-term operation, and shortening the experimental period; in the test process, the pressure and temperature of the reaction kettle are automatically collected, a pressure-time curve is established, and the degradation resistance of the sample is comprehensively judged according to the pressure drop rate and inflection point time. The method for evaluating the degradation performance of the carbon capture absorbent can be used for rapidly and comprehensively evaluating the sample, and meanwhile, the degradation degree can be analyzed and judged without the help of high-end equipment such as cation chromatography and gas chromatography, so that the method is convenient and efficient; the method is particularly suitable for testing and optimizing the oxidation resistance of novel absorbents such as composite absorbents and phase change absorbents.

The invention discloses a method for determining the content of monosaccharide in seaweed, and belongs to the technical field of biological detection. According to the method, an ion chromatography sugar separation system is adopted, a pulse ampere detector is combined, CarboPac PA20 is used as a sugar analysis column, and the eight monosaccharide components in the seaweed can be detected under the limited extraction and purification method. The method is low in detection limit, good in stability and suitable for measuring the content of free monosaccharide and polysaccharide hydrolyzed monosaccharide in common algae (such as brown algae, green algae and red algae).

The invention discloses a construction method and application of a fucoidin fingerprint spectrum, monosaccharide composition of fucoidin is used as fingerprint spectrum research of index components, and ion chromatography fingerprint spectrums of different batches of fucoidin are constructed by optimizing an acid hydrolysis method and ion chromatography conditions. A theoretical basis can be provided for the quality control of the fucoidin. Meanwhile, the ion chromatograms of different algal polysaccharides are analyzed to find that different algal polysaccharides have differences, and reference is provided for quality control of fucoidin and algal polysaccharides from different sources.

The utility model relates to the chromatographic technology, in particular to an ion chromatograph which comprises a conveying unit, a separation unit and a detector, the conveying unit comprises a container and a conveying pump, the ion chromatograph further comprises a sealing module and a driving module, the sealing module is arranged at an opening of the conveying pump, and the opening allows gas to pass through; the driving module is used for driving the sealing module and controlling the delivery pump to be in a first state and a second state, when the driving module is in the first state and the delivery pump operates, gas in the delivery pump is exhausted through the opening, and when the driving module is in the second state, the delivery pump is isolated from the outside at the opening. The device has the advantages of automatic maintenance and the like, and is applied to ion chromatography.

The invention discloses a Maotai-flavor liquor process category and authenticity identification model construction method, an identification method, an identification device and equipment. The method comprises the following steps: acquiring data of liquor samples; preprocessing the sample data to obtain preprocessed sample data; the preprocessed sample data are input into an initial identification model constructed based on a graph neural network or a partial least square discrimination method, the initial identification model is trained, target identification models are obtained, and the target identification models comprise a gas chromatography identification model, an ion chromatography identification model and / or a three-dimensional fluorescence spectrum identification model. According to the method, multiple analysis technologies such as GC, IC and EEM and a chemometrics modeling analysis module are adopted, analysis results of different technologies are mutually verified, a target identification model with high prediction precision is constructed, and accurate identification of the process category and authenticity of the Maotai-flavor liquor is realized.

The invention relates to the technical field of soil element determination, in particular to a method for determining potassium, sodium, calcium and magnesium in soil soluble salt, which comprises the following steps: S1, collecting and preparing a soil sample; s2, preparing a soil sample leaching solution; s3, instrument detection; and S4, data processing and calculation. According to the method, vacuum freeze drying is combined with an ultrasonic-microwave combined extraction technology, and plasma spectrum and ion chromatography combined analysis is adopted, so that the detection efficiency and accuracy are improved, meanwhile, reagent consumption and labor cost are greatly reduced, the problems that a traditional process is tedious, consumed time is long, and precision is insufficient are solved, and the method is suitable for industrial production. The method has the advantages of being convenient to operate, environmentally friendly and the like, can be widely applied to the fields of soil salinization monitoring, agricultural land quality evaluation and geological disaster prevention and control, and provides reliable technical support for environmental protection and resource management.

The invention discloses an analysis method for determining the content of galactosamine in sulfated polysaccharide based on high-temperature hydrochloric acid hydrolysis and an ion chromatograph method, which comprises the following steps: hydrolyzing a test sample with hydrochloric acid at high temperature to release galactosamine, separating with an ion chromatograph and a sugar analysis column, detecting with a pulsed ampere detector, and determining the content of galactosamine in sulfated polysaccharide according to a galactosamine reference substance. And quantitatively analyzing the content of galactosamine in the test sample. The method disclosed by the invention has the advantages of simplicity, rapidness, accuracy, high efficiency, no need of derivation treatment and the like.

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 relates to the technical field of ion chromatographs, and provides a method for correcting an error of a flow velocity set value of an ion chromatograph, which comprises the following steps of: calculating the actual flow velocity of a mobile phase and the actual rotating speed of a motor according to the theoretical flow velocity of the mobile phase of the ion chromatograph and the actual rotating speed of the motor, and performing a verification process; and finally, calculating a compression coefficient under a certain pressure-multiplying condition, and adjusting the actual rotating speed of the motor according to the compression coefficient, so that the instantaneous flow velocity of the mobile phase at the outlet is equal to the set theoretical flow velocity, thereby completing the correction of the flow velocity set value error of the ion chromatograph. Therefore, the stability of the separation effect of the sample in the ion chromatograph can be ensured, and the accuracy of the detection result is improved. The invention further discloses a device for correcting the error of the flow velocity set value of the ion chromatograph and a computer readable storage medium.

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. The name of this design product: Eluent Generator. 2. Purpose of this design product: used to automatically generate the eluent required for ion chromatograph. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

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.