317 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 belongs to the field of analysis and detection, and particularly relates to a method for detecting glycosylglycerol in dairy products. The method is realized by the following steps: firstly, pre-treating a sample; preparing a standard stock solution; and an ion chromatography method is adopted for detection. According to the detection method provided by the invention, the glycosylglycerol in the dairy product can be effectively detected, the matrix effect is greatly reduced, a complicated pretreatment process is not needed, the specificity is high, the detection time is greatly reduced, the repeatability is good, and a technical support and a quality control guarantee are provided for the application of monitoring the glycosylglycerol in the dairy product; according to the detection method provided by the invention, the adsorption of the target component on the ion exchange resin can be reduced, the retention time is shortened, the peak trailing is reduced, and the detection sensitivity is improved.

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 relates to the technical field of ion chromatography detection, in particular to a high-pressure cam pump stable in conveying flow, which at least comprises a first pumping assembly, and the first pumping assembly comprises a pump head, a pump body, a plunger rod, a liquid inlet, a liquid outlet and a sealing assembly. A liquid inlet and outlet structure is improved, and a liquid outlet is formed in the tail end of a pump cavity, namely, the liquid outlet is formed in the contact position of the pump cavity and a sealing assembly, so that liquid is pumped out in a first-in first-out mode, namely, the sucked liquid is pumped out first, dissolved gas or air bubbles and the like in the liquid conveying process are removed in time, and the liquid conveying efficiency is improved. Meanwhile, the liquid outlet is formed in the position of the sealing assembly, bubbles accumulated for a long time at the position of the sealing assembly can be taken out in time when the liquid is pumped out, and after operation is carried out for a period of time, the conveying flow is stable and the precision is high; and compared with the situation of poor conveying flow precision, the improvement effect is remarkable.

The invention belongs to the field of ion chromatography, and particularly relates to a temperature adjusting method and device for an ion chromatograph column oven, and the method comprises the steps: firstly, building a temperature change model based on the Newton's cooling law; after a heat source in the column oven begins to heat, three time points t1, t2 and t3 are selected, t3-t2 is made to be equal to t2-t1, cavity temperatures T1, T2 and T3 corresponding to temperature sensors in the column oven at the three moments are recorded, and temperature models corresponding to the moments are built; logarithms of the model formulas of the cavity temperature values T1, T2 and T3 at the three moments t1, t2 and t3 are taken and calculated to obtain a prediction model of the final cavity temperature value T; establishing an equilibrium state equation, and directly adjusting the heat source according to the calculated heat source temperature. According to the method, the waiting time after adjustment is shortened, and the time required by a temperature control system is shortened; and the temperature required to be set by the heating body can be directly obtained, and the operation can be completed through one-time adjustment without repeated adjustment, so that the energy consumption is reduced, and the working efficiency is improved.

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 invention belongs to the field of ion chromatography, and particularly relates to a temperature prediction method and device for an ion chromatograph column oven, and the method comprises the steps: firstly constructing a temperature change model based on the Newton's cooling law; after a heat source in the column oven begins to heat, three time points t1, t2 and t3 are selected, t3-t2 is made to be equal to t2-t1, cavity temperatures T1, T2 and T3 corresponding to temperature sensors in the column oven at the three moments are recorded, and temperature models corresponding to the moments are built; logarithms of the model formulas of the cavity temperature values T1, T2 and T3 at the three moments t1, t2 and t3 are taken and calculated to obtain a prediction model of the final cavity temperature value T; and calculating and comparing the final temperature value T final value of the cavity with the required temperature value T required of the cavity, and adjusting the temperature T heat source of the heat source in advance. According to the method, the waiting time after each adjustment is reduced, the time required by the temperature control system is shortened, the response speed of the system is improved, the energy consumption can be reduced, and the working efficiency is improved.

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 provides a control method of an ion chromatography three-column suppressor. The control method comprises the following steps: (1) obtaining the running time P1 of the three-column suppressor in an equilibrium state; (2) judging whether the balance state operation time P1 reaches the balance column switching time T1 or not, not switching the position of the suppressor column under the condition that P1 is less than T1, and switching the position of the suppressor column under the condition that P1 is equal to T1; (3) judging whether a sample introduction signal is received or not, and repeating the step (2) when the sample introduction signal is not received; turning to the step (4) when a sample introduction signal is received; (4) sample injection detection is started, and the operation time P2 of the three-column suppressor in the sample injection state is obtained; (5) judging whether the sample injection state operation time P2 reaches the sample injection column cutting time T2 or not, and under the condition that P2 is less than T2, not switching the suppressor column body; and under the condition that P2 is larger than or equal to T2, the position of the suppressor cylinder is switched, and the step (3) is repeated. The invention further discloses a control device of the ion chromatography three-column suppressor and a computer readable storage medium.

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 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.

To provide a polyamide composition which is excellent in machine physical properties, heat resistant aging properties at 180°C for a long term of about 2,000 hours, and electric characteristic, is suppressed in bleedout of an additive agent at 80°C and a relative humidity of 95%, makes an additive agent hardly elute in water, and enables obtaining a molded article having excellent external appearance.SOLUTION: A polyamide composition contains: (A) polyamide; 0.1 pt.mass or more and 3 pts.mass or less of (B) branch type polyamine based on 100 pts.mass of the (A) polyamide; 0.05 pt.mass or more and 3 pts.mass or less of (C) steric hindrance phenol; and 0.01 pt.mass or more and 0.5 pt.mass or less of (D) azine dye or phthalocyanine dye. A concentration of (F) halide ion measured by combustion ion chromatography is 500 mass ppm or less based on the total mass of the polyamide composition.SELECTED DRAWING: None

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 embodiment relates to a polishing pad that comprises a polishing layer. When pyrolysis oil obtained by pyrolyzing the polishing layer at 320°C for 6 hours is analyzed by combustion-ion chromatography (C-IC) in accordance with the IEC 62321-3-2 standard, the content of chlorine (Cl) is less than 10,000 ppm. Further, the pyrolysis oil can be used as a high-quality energy source through a refining process.

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.

A conductivity detector module for an ion chromatography system includes a detector cell configured to receive an eluent stream from the ion chromatography system, the detector cell including a first electrode and a second electrode in electrical contact with the eluent stream; a first current branch coupled to a first cell drive input and to the first electrode and providing a first cell output; and a second current branch coupled to a second cell drive input and to the second electrode and providing a second cell output, wherein the first cell drive input and the second cell drive input are of equal magnitude and opposite sign.