30 results about "Ionic chromatography" patented technology

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 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.

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.

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 application discloses a Cs-4 polysaccharide extract quality detection method, and relates to the technical field of analysis and detection, and comprises the following steps: S1, acid hydrolysis is carried out on the Cs-4 polysaccharide extract, and after removing the acid, a hydrolyzate is obtained; S2, the hydrolyzate is subjected to anion exchange chromatography combined with pulse amperometric analysis, and a chromatogram is obtained; S3, a standard curve of a plurality of monosaccharides is prepared; S4, the chromatogram obtained in S2 is compared with the standard curve obtained in S3 and analyzed and calculated, and the components and contents of the monosaccharides are obtained. The ion chromatography method for separating monosaccharides by adopting an anion exchange column and detecting monosaccharides by a pulse amperometric detector directly analyzes the monosaccharide composition; the method does not need a derivatization reaction, has high sensitivity, and can realize comprehensive characterization of neutral, alkaline and acidic polysaccharides.

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.

This invention provides a biomass-derived phenol composition in which moldy odor is suppressed. [Solution] A phenol composition containing biomass-derived phenol (A), wherein the peak height percentage corresponding to isobutyraldehyde in total ion chromatography by GC-MS after pretreatment by 150°C headspace method is 4.0% or less.

The utility model belongs to the detection appearance analysis technical field especially relates to a portable multi -passage anion concentration detector and folding conductivity detector, including box, the box top is equipped with the taking outlet, and is equipped with the apron in the taking outlet, is equipped with the adjusting mechanism in the apron, is equipped with fixed assembly on the slide plate, adjusting mechanism includes the swivel lever, the chamber is equipped in the apron inside, the swivel lever rotation is installed in the chamber, and the swivel lever upper end extends to the apron outside, the swivel lever outside is equipped with the support in the chamber symmetry, and the support far from the swivel lever one end respectively through the transmission link articulated has the push rod, the utility model discloses when operating, twists the swivel lever, drives the plug block to remove the insertion slot, pulls the handle and drives the apron, makes the slide plate go up, and the multi -passage ion chromatograph removes the box, overturns the apron, lets the connecting rod press in the box top, loosens the swivel lever, and spring two make the plug block reset and insert the fixed block, and after fixing, can operate the instrument, after using, repeats the operation and puts the instrument in the box, realizes the convenient storage and protection.

This invention discloses a multimode liquid chromatography packing material for aminated silica gel modified with an interpenetrating network hydrogel, its preparation method, and its applications, relating to the field of high-performance liquid chromatography (HPLC) separation and analysis technology. The packing material is obtained by modifying the surface of aminated silica gel with an interpenetrating network hydrogel formed from carboxymethyl chitosan and poly(N-isopropylacrylamide) using chemical polymerization. The packing material provided by this invention can be used for the separation and analysis of compounds of different polarities. The interpenetrating network structure formed by the two monomers gives the hydrogel-modified layer higher mechanical strength, and the different interaction sites enable multimode (hydrophilic chromatography mode, hydrophobic chromatography mode, and ion chromatography mode) separation and analysis of compounds with different polarities. The preparation method provided by this invention is simple, and the prepared packing material has significant application potential in the field of chromatographic separation and analysis.

An ion chromatography analysis system includes a system monitoring part being configured to detect an abnormality, to determine, based on a fluctuation rate in a certain time of the predetermined state of a most recent of the monitor value, whether the fluctuation is a short-term fluctuation that occurs in a short term or a long-term fluctuation that occurs in a long term, and to identify a cause of the abnormality by using whether the fluctuation is the short-term fluctuation or the long-term fluctuation.

The application relates to the technical field of analytical instruments, and particularly discloses a sealing structure for a pump and an ion chromatography pump, wherein a stepped hole is formed between a low-pressure cavity and a high-pressure cavity of a pump shell; in the pump shell, a piston rod can make reciprocating linear motion relative to a pump body; a sealing sleeve is installed in the stepped hole and sleeved on the piston rod, a small-diameter section of the sealing sleeve comprises an inner ring and an outer ring which are arranged at intervals in the radial direction, the inner ring is attached to the outer peripheral wall of the piston rod, the outer ring is attached to the inner peripheral wall of the stepped hole, a placing groove is formed at the joint of the small-diameter section and a first large-diameter section, the placing groove is in communication at the head and tail around the axis, the outer side wall of the first large-diameter section is tightly attached to the inner side wall of the stepped hole; a first sealing ring is at least partially located in the placing groove and can be elastically deformed; the hardness of the first sealing ring is smaller than that of the sealing sleeve. The sealing sleeve and the first sealing ring both have the effect that the sealing capacity increases with the increase of the pressure of the high-pressure cavity, and multi-stage sealing is formed along the leakage direction of the fluid, which further improves the reliability of the sealing.

The application discloses a method for determining the content of carvacol in compound fertilizer, and the method comprises gas phase determination and liquid chromatography, and the gas chromatography method for determining the content of carvacol in compound fertilizer comprises the following steps: S1, sample pretreatment; S2, matrix purification; S3, chromatographic analysis; and S4, quantitative calculation; in the application, a silica gel SPE column is used to replace a traditional diatomite column in the GC method, the polarity impurity adsorption is enhanced through ethyl acetate-hexane gradient activation, sodium chloride salting-out and EDTA complex metal ions are introduced in the HPLC method, the number of miscellaneous peaks in the GC chromatogram is reduced, the separation degree of the carvacol peak is improved, and the service life of the HPLC column is prolonged; the GC method is operated under the conditions of temperature control ultrasonic at 35±2 DEG C and full light avoidance; the HPLC method adopts room temperature methanol-water system extraction, and the recovery rate of the GC method is improved; the HPLC method avoids the 60 DEG C concentration requirement of acetonitrile extraction, and the light stability is improved.

The application relates to a method for identifying bauxite doped with secondary aluminum ash, and belongs to the technical field of chemical analysis. The application realizes rapid preliminary screening and accurate quantitative confirmation of the secondary aluminum ash doped in the bauxite, uses ion chromatography equipment popularized in an alumina plant to replace an expensive X-ray diffractometer, solves the technical problems of high detection cost and long period, and improves the reliability of the identification result through double verification of precipitation observation and ion quantification.

The application relates to an ion chromatograph facilitating sample feeding, and belongs to the technical field of ion chromatographs. The ion chromatograph comprises a machine body, a side wall of one side of the machine body is provided with a sample feeding port, a mounting seat is fixedly arranged on one side of the sample feeding port, a plurality of mounting grooves are formed in the upper surface of the mounting seat, a sample feeding cylinder is arranged in the mounting groove in a vertical direction, a moving seat is sleeved at the top end of the sample feeding cylinder, the sample feeding cylinder and the moving seat are threadedly connected, a first spring is fixedly arranged between the moving seat and the mounting seat, a material passing cover is fixedly connected to the bottom end of the sample feeding cylinder, the material passing cover is funnel-shaped, the material passing cover is connected with the mounting groove and the sample feeding cylinder, a closing plate is arranged in the material passing cover, an elastic assembly for resetting the closing plate is arranged between the closing plate and a material guiding block, a trigger assembly for moving the closing plate is arranged in the mounting groove, a sample feeding pipe is fixedly connected to the end of the mounting seat away from the moving seat, one end of the sample feeding pipe away from the mounting seat extends into the sample feeding port, and the application has the effect of improving detection efficiency.

The application discloses a kind of rapid detection method based on monosaccharide component material and content in Liupu tea, the method of the present application has the characteristics of less sample consumption, high extraction efficiency, green environmental protection;Including the following steps: S1, respectively take each monosaccharide component material to prepare and obtain mixed standard working solution of different content;S2, the mixed standard working solution of different content is sequentially placed into ion chromatograph to determine and obtain the mixed standard substance information of different content, after finding the chromatographic peak and peak area of each monosaccharide component material one by one, the standard curve of each monosaccharide component material is analyzed and obtained;S3, take Liupu tea sample to carry out ultrasonic enzymolysis extraction, dilution, purification and obtain Liupu tea sample machine liquid, take Liupu tea sample machine liquid and place into ion chromatograph to determine and obtain Liupu tea sample information;S4, according to retention time, determine the monosaccharide component material contained in Liupu tea sample, and calculate the content of each monosaccharide component material according to formula.

Provided herein is an ion source comprising a plurality of components, at least one of which is partially coated with a layer of silicon. The ion source reduces reactivity between a sample and a carrier gas, reduces or eliminates tailing in an ion chromatogram, and / or improves mass spectrometric fidelity. Also provided are methods of using the ion source in a mass spectrometer or a gas chromatograph mass spectrometer.

The present application relates to a kind of ion chromatography, mass spectrometer calibration device for combination, be arranged between suppressor outlet and mass spectrometer ion source entrance.The device includes the main body by inner core and shell, and annular sample cavity of containing calibration fluid is enclosed between the two.The inner core is internally provided with sample main flow channel, and its contraction part, throat and diffusion part constitute venturi structure;Throat is provided with the permeation window covered by semi-permeable membrane.The first electrode and the second electrode are respectively arranged on the inside and outside of semi-permeable membrane.Controller controls electrode to establish positive electric field when calibration, accelerates sample ion to pass through semi-permeable membrane and enter main flow channel;Reverse pulse electric field is established when calibration ends, and residual components on semi-permeable membrane are sucked back into annular sample cavity.Using venturi fluid dynamic pressure and electrode drive coupling, the precise addition of internal standard substance is realized without mechanical pulse, and phase lag and memory effect are completely eliminated, and the stability of system detection is significantly improved.

The present application relates to the field of analytical instrument, especially to a detection device and method for membrane-protected solid phase microextraction and ion chromatography. The device comprises a membrane-protected solid phase microextraction instrument and an ion chromatography instrument; the outer surface of the extraction head of the membrane-protected solid phase microextraction instrument is wrapped with a polypropylene porous membrane; the extraction head is inserted into a desorption cell for release after adsorbing a sample in a sample bottle; the ion chromatography instrument comprises a mobile phase delivery system, a six-way valve, a separation system, a monitoring and data processing system; the six-way valve is connected with the mobile phase delivery system, a liquid inlet pipeline, a waste liquid bottle and the separation system respectively; the separation system is connected with the monitoring and data processing system; one end of the desorption cell is connected with the mobile phase delivery system, and the other end is connected with a sample inlet pipeline; a sample inlet pump and a degassing box are arranged on the sample inlet pipeline. The present application realizes accurate monitoring of trace level anions such as F ‑ , Cl ‑ , SO4 2‑ in the primary coolant of a nuclear power plant.

The present application relates to the technical field of ion chromatography eluent regulation, and particularly relates to an ion chromatography eluent online regulation system and method, wherein a multi-source eluent generation unit, a dynamic mixing and gradient regulation unit, a feedback control unit and a multi-system switching unit are arranged, the actual detection signal in the chromatographic separation process is actively adjusted to eluent, dynamic closed-loop regulation of the eluent components and concentration is realized, automatic switching between different eluent systems and automatic cleaning before switching can be realized, manual intervention is not needed, tedious processes and pollution risks caused by manual operation are effectively avoided, and the adaptability and continuous operation efficiency of different detection tasks are improved.

This invention relates to the field of fault early warning technology, and more specifically, to a remote fault diagnosis and early warning method for a chromatograph, comprising: acquiring operating data of the ion chromatograph, the operating data including a real-time pressure sequence of the high-pressure pump, a real-time torque signal sequence of the pump drive motor, and a baseline data sequence of the conductivity detector; and calculating a pressure energy fluctuation index in the overlapping area within each pumping cycle based on the pressure sequence and torque signal sequence, wherein the pressure energy fluctuation index is used to characterize the degree of fluid kinetic energy loss caused by a faulty one-way valve seal. This invention enables causal correlation analysis of the chromatograph's mechanical abnormality leading to a decrease in detection signal, provides early warning of one-way valve failures and offers tiered maintenance suggestions, significantly improving the intelligent remote maintenance level of precision analytical instruments.

The application belongs to the technical field of analytical chemistry instruments, and particularly relates to an ion chromatography sampling device and method based on negative pressure driving. The application realizes closed and automatic transfer of samples by switching between different ports of a multi-channel switching valve, sequentially connecting a sampling pipeline, a quantitative ring and a waste liquid pipeline, using negative pressure to directly suck the sample from a sample bottle into the quantitative ring, and then switching the multi-channel switching valve to make the eluent carry the sample in the quantitative ring into a chromatographic analysis unit for detection. Meanwhile, a filter is arranged in the sampling pipeline to ensure that only clear sample liquid can enter the quantitative ring and the multi-channel switching valve. The application solves the problems of cross contamination and high cost of consumables in the ion chromatography sampling process in the prior art.

This utility model discloses a hydrogen peroxide ion chromatography analysis device, comprising: a first flow path switching assembly, which includes a first multi-way switching valve, a first quantitative loop, and a second quantitative loop, wherein the first quantitative loop and the second quantitative loop are respectively connected to corresponding connection ports of the first multi-way switching valve, and the volume of the first quantitative loop is smaller than the volume of the second quantitative loop; a second flow path switching assembly, which includes a second multi-way switching valve and a concentration column, wherein the concentration column is connected to a corresponding connection port of the second multi-way switching valve; a chromatographic analysis assembly, which includes a chromatographic column, a suppressor, and a conductivity cell connected in sequence; an injection assembly, which includes an injection needle; and an eluent delivery pump, which is configured to deliver eluent to the second multi-way switching valve. This device achieves the requirement for trace detection of hydrogen peroxide.

This invention discloses an adaptive gradient correction method and system for ion chromatography based on real-time feedback of detection signals. The method extracts the actual retention time and peak width of the chromatographic peak from the key detection signals of the acquired chromatographic peak. Based on the actual retention time and a preset standard retention time, the retention time drift is calculated. The retention time drift and peak width are used to determine if the chromatographic separation is abnormal. When abnormality occurs, the key detection signals, retention time drift, and peak width of the acquired chromatographic peak are input into a chromatographic separation state prediction model to predict the gradient adjustment amount to achieve optimal separation. This method and system can sense the chromatographic analysis state in real time and automatically adaptively correct the gradient program, solving problems such as retention time drift and decreased resolution, improving the accuracy, stability, and efficiency of chromatographic analysis, and extending the lifespan of the chromatographic column.

The application discloses a detection method of n-hexyl glucoside, and relates to the technical field of pesticide residue detection. The detection method is determined by ion chromatography electrochemical detection. The detection method has the characteristics of simple operation, short time consumption, accurate detection, low detection limit and low quantitative limit, is suitable for the detection of n-hexyl alkyl glucoside in various samples, and provides a new detection method for the detection of n-hexyl alkyl glucoside.

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.

1. Name of the design product: ion chromatograph. 2. Use of the design product: for ion detection analysis. 3. Design points of the design product: in shape. 4. Picture or photo best indicating the design points: perspective view. 5. The bottom surface of the design product is the part that is not easy to see or cannot be seen during use, and the top view is omitted.

The application relates to an oral alendronate sodium solution and a detection and characterization system thereof, and belongs to the fields of pharmaceutical preparations and analytical chemistry. The oral solution comprises an alendronate sodium active ingredient and specific excipients, and is characterized in that the contents of phosphate and phosphite are lower than 0.20 ug / mL, and the solution has an ultra-low impurity attribute. The application provides a robust preparation process, a high-precision ion chromatography-conductivity detection method, and a complete verification and characterization system. The method has strong specificity, high precision and a wide linear range, and overcomes the defects of inaccurate detection and unstable process in the prior art. The overall scheme realizes high batch consistency of the product, improves safety, meets the clinical needs of osteoporosis treatment, and has significant technical advantages and market competitiveness.

The application provides a kind of exploitation wastewater organic pollutant detection method, system, equipment and medium, by identifying the signal intensity of wastewater sample is first rapidly rising and then rapidly falling when being oxidized by free radical, and then the accurate mass-to-charge ratio value of the molecular ion corresponding to the mass-to-charge ratio signal is extracted as the mass identification of the candidate intermediate product;Extract a plurality of complete molecular ions from the candidate intermediate product as a list to be identified;Generate the ion chromatogram of the mass identification corresponding to each complete molecular ion in the oxidation process, and then determine the matching degree between each ion chromatogram and the standard transient peak shape template;Based on all matching degrees, identify the potential toxic transient intermediate product from the list to be identified, and generate a pollution identification report of the wastewater sample. Using the scheme of the application, the actual conversion path of the pollutant can be reflected to reduce the identification omission of the potential toxic transient intermediate product in wastewater.

The present invention relates to an optical device, for use in ion chromatography detection of a sample, comprising: a light source portion configured to provide light having a predetermined wavelength range to form a first light beam propagating in free space; and a flow cell provided with a guide channel, wherein the guide channel accommodates the sample and is provided with a first lens and a second lens, a first clear aperture is provided at the first lens, and a second clear aperture is provided at the second lens; the ratio of the first clear aperture to the second clear aperture is between 1 and 3, and the ratio of the equivalent spot size of a focusing portion to the second clear aperture is not greater than 0.5, such that the ratio of the light intensity of a third light beam to the light intensity of the first light beam is not less than 62%. By generating a highly focused light beam in the flow cell, the device increases the ratio of the intensity of emitted light to the intensity of incident light, thereby improving the light utilization efficiency and enhancing the sample detection sensitivity. In addition, the present invention also relates to an analysis device and a data analysis method.

This invention discloses a method for simultaneously detecting sulfate ions and lithium salts in lithium battery electrolytes, belonging to the field of chemical analysis technology. The method includes: diluting the lithium battery electrolyte to be tested with water to obtain a test solution; and detecting the test solution using an ion chromatograph. The chromatographic conditions include: using an anion exchange column; eluent being a mixed aqueous solution containing sodium carbonate, sodium bicarbonate, and acetonitrile, wherein the concentration of sodium carbonate is 4.5–5.5 mmol / L, the concentration of sodium bicarbonate is 3.8–4.5 mmol / L, and the volume percentage of acetonitrile is 25–35%. The overall analytical process of this invention can be controlled within 30 minutes, and the detection limit is far below the industry standard requirements, achieving rapid and accurate simultaneous determination of multiple lithium salts and sulfate impurities in the electrolyte in a single ion chromatographic analysis.