239 results about "Ion 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 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).

To provide a method for producing formaldehyde capable of reducing negative influence on catalysts and the like during a process for producing formaldehyde by using methanol.SOLUTION: A method for producing formaldehyde using methanol as a raw material, the methanol containing nitrogen oxides, wherein the concentration of NO2 in the methanol, as detected by ion chromatographic analysis, is 0.002 mass ppm or more and 100 mass ppm or less.SELECTED DRAWING: Figure 1

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 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 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 invention relates to a method for identifying regenerated plastics, which comprises the following steps of: taking a standard substance containing a known component and an object to be detected to a pyrolysis gas chromatography-mass spectrometer (Py-GC-MS) for detecting the regenerated plastics, and firstly establishing a regenerated plastic recovery ratio regression equation corresponding to the standard substance; substituting a signal intensity value of a total ion chromatogram of a to-be-detected object corresponding to the to-be-detected object containing the known component, and judging the content of regenerated plastic of the component of the to-be-detected object through linear regression operation; moreover, according to the qualitative method provided by the invention, when the total ion chromatogram of the to-be-detected object is obtained, whether the to-be-detected object contains the reprocessed plastic corresponding to an index compound can be judged by means of the peak of the total ion chromatogram of the to-be-detected object in the index compound of the molecular weight residence time of the to-be-detected object.

The present invention belongs to the field of detection and relates to a method for determining guar gum content. The method comprises: extracting guar gum from reconstituted tobacco leaf base by soaking and shaking with an aqueous solution; evaporating the extract to dryness; decomposing the guar gum into mannose and galactose by acid hydrolysis; and then detecting the mannose and galactose contents by ion chromatography, thereby converting the guar gum content. The method can accurately determine the guar gum content in reconstituted tobacco leaf base and is simple to operate.

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 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.

The utility model discloses a gaseous pollutant monitoring devices of semiconductor clean room gathers sample gas through the gas collection subassembly of setting in semiconductor dustless room, and the anion and cation in sample gas are dissolved as sample solution through the impact bottle, and the standard solution of different concentration gradient is diluted through the standard solution dilution subassembly, and the ion chromatography analyzer is through the responsivity of different concentration gradient standard solution to the anion and cation in sample solution, and establishes standard curve and carries out quantitative analysis, and calculates the concentration of anion and cation, realizes the monitoring to the gaseous pollutant that possibly exists in semiconductor clean room, and the equipment short circuit risk that the sample solution in impact bottle caused is effectively prevented through setting up the anti -suck back subassembly of the application, and the anti -suck back subassembly is directly set up in impact bottle, and compared with setting up anti -suck back bottle alone, saves material piece, and the anti -suck back effect is better, and the equipment is not easily affected by short circuit, prolongs the service life of equipment.

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 electrostatic charge image developing toner set contains a fluorescent toner that contains a fluorescent colorant and has a brightness of 75 or more, and a non-fluorescent toner that contains no fluorescent colorant, in which an amount of Na+ on a surface of the fluorescent toner, that is measured by an ion chromatography method, is 0.005 mg / L or more and 0.050 mg / L or less, and a difference between the amount of Na+ on the surface of the fluorescent toner and an amount of Na+ on a surface of the non-fluorescent toner, that are measured by the ion chromatography method, is 0.050 mg / L or more, where the amount of Na+ is an amount of Na+ detected by a method in which 0.5 g of the fluorescent toner or the non-fluorescent toner is weighed, and then added to 100 g of deionized water at 30° C.±1° C., the mixture is dispersed by ultrasonic waves for 30 minutes, and then filtered through a filter, and the filtrate is analyzed by the ion chromatography method.

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.

1. Name of the designed product: eluent generator. 2. Use of the designed product: for generating eluent in ion chromatography detection. 3. Design points of the designed product: in the combination of shape and pattern. 4. Picture or photo best indicating the design points: perspective view.

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.

A carbon material which contains at least carbon, nitrogen and bromine as constituent elements, has a bromine content of 50-100,000 ppm by mass as measured by combustion ion chromatography, and satisfies 0.005 < = Nxps / Cxps < = 0.300, the number Cxps of carbon atoms and the number Nxps of nitrogen atoms as measured by X-ray photoelectron spectroscopy.

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.

The invention relates to the technical field of chemical analysis and detection, in particular to a method for detecting halogen in a paper printed matter based on oxygen bomb combustion-ion chromatography. The detection method comprises the following steps: placing a folded to-be-detected paper printed matter in an oxygen bomb device, introducing oxygen, and combusting to obtain a to-be-detected liquid; a strong alkali solution is added into an oxygen bomb combustion cavity of the oxygen bomb device; a hydrogen peroxide solution is added into the absorption cup; and carrying out ion chromatography detection on the to-be-detected liquid, and obtaining the content of halogen in the to-be-detected paper printed matter according to the detected peak area of halogen and a preset standard curve. The combustion area is increased by folding the sample, the combustion efficiency is improved, oxygen is supplied through the hydrogen peroxide solution, and sufficient combustion of the sample is ensured; cO2 is absorbed by using a strong alkali solution, the pressure of the cavity is reduced, and the operation safety is improved; and then microgram / kg-level detection is realized by utilizing an ion chromatography method.

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 provides a detection method and detection system suitable for chemical pollutants in acid and alkali air in ambient air, and belongs to the technical field of ambient air detection.The detection method comprises the steps that H2O2 absorption liquid with the concentration being 50-200 mg / L is added into a closed absorption container, and a certain liquid level height is maintained; the outlet end of an input pipe for introducing ambient air is arranged at the bottom of the absorption liquid, the inlet end of an output pipe for leading out gas is arranged above the liquid level of the absorption liquid, the sampling flow is controlled through a sampling pump, and the absorption liquid is used for carrying out impact sampling on the ambient air; after sampling, the ion concentration in the collected sample is analyzed by ion chromatography, and is converted into the concentration of chemical pollutants in acid and alkali air. The detection method improves the sensitivity and efficiency of collection of the chemical pollutants of the acid and alkali air in the atmospheric environment, improves the timeliness of detection, and is suitable for detection of the chemical pollutants of the acid and alkali air in an electronic clean room and the ambient atmosphere.

The present embodiment relates to a manufacturing method of a laminate and the like, and the manufacturing method of the laminate includes: a preparation step of preparing a processing object, the processing object being a laminate before processing provided with a light shielding film, and a carbonic acid water cleaning step of preparing a cleaned laminate by applying a carbonic acid water cleaning process of applying ultraviolet rays and carbonic acid water to the processing object; wherein the light shielding film contains a transition metal, and further contains oxygen, nitrogen, or carbon, the laminate has a residual ion content determined by ion chromatography, the residual ions include a sulfur-based ion and a nitric acid-based ion, the content of the sulfur-based ion is greater than 0 ng / cm 2 and equal to or less than 0.1 ng / cm 2 , the content of the nitric acid-based ion is greater than 0 ng / cm 2 and equal to or less than 0.1 ng / cm 2 . The present embodiment can minimize the performance variation of the laminate, remove particles and the like existing on the outer surface or surface of the laminate, and effectively suppress unexpected haze generated in the exposure process.

The utility model discloses a cleaning device for an ion chromatography automatic injection sample bottle, and belongs to the technical field of environment monitoring. According to the cleaning device, disassembly of the sample bottle is achieved through the mechanical arm, fixing of a bottle body of the sample bottle is achieved through a fixing ring of the washing mechanism, solution pouring and overturning water control are facilitated, the sample bottle is cleaned, in addition, the washing mechanism achieves cleaning of the bottle body and a bottle cap through partition, and the cleaning fineness is guaranteed; and waste liquid is collected through the waste liquid recovery pipeline, so that the washing mechanism can conveniently replace cleaning liquid in time, and the cleaning speed and the cleaning quality are improved. In the cleaning process, the sample bottle does not make contact with the human body any more, the phenomenon that the sample bottle is polluted by salt in sweat is avoided, meanwhile, the sample bottle is mechanically cleaned, it is guaranteed that the cleaning solution, the cleaning time and the cleaning mode are controllable, the consistency and thoroughness of cleaning each time are guaranteed, the defects in the prior art are effectively overcome, and the cleaning efficiency is improved. And the water quality detection efficiency and accuracy are improved.

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 belongs to the technical field of chloride ion detection, and provides a method for determining chloride ions through high-temperature combustion-ion chromatography. The method comprises the following steps: carrying out pyrolysis combustion on 2, 2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane, and sequentially carrying out condensation, absorption and volume metering to obtain a sample solution; respectively injecting the sample solution and the blank solution into an ion chromatograph to measure the conductivity value of the chloride ions, and measuring the content of the chloride ions through an external standard method. According to the detection method, the structure of the organic matter can be fully destroyed, the content of chloride ions in polyimide products can be accurately detected, and meanwhile the method has the advantages of being low in detection limit, high in accuracy, high in sensitivity, good in reproducibility, good in stability, high in detection speed and little in interference.