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11 results about "Graphite furnace atomic absorption" patented technology
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Graphite furnace atomic absorption spectroscopy (GFAAS) (also known as Electrothermal Atomic Absorption Spectroscopy (ETAAS)) is a type of spectrometry that uses a graphite-coated furnace to vaporize the sample. Briefly, the technique is based on the fact that free atoms will absorb light at frequencies or wavelengths characteristic of the element of interest (hence the name atomic absorption spectrometry). Within certain limits, the amount of light absorbed can be linearly correlated to the concentration of analyte present. Free atoms of most elements can be produced from samples by the application of high temperatures. In GFAAS, samples are deposited in a small graphite or pyrolytic carbon coated graphite tube, which can then be heated to vaporize and atomize the analyte. The atoms absorb ultraviolet or visible light and make transitions to higher electronic energy levels. Applying the Beer-Lambert law directly in AA spectroscopy is difficult due to variations in the atomization efficiency from the sample matrix, and nonuniformity of concentration and path length of analyte atoms (in graphite furnace AA). Concentration measurements are usually determined from a working curve after calibrating the instrument with standards of known concentration. The main advantages of the graphite furnace comparing to aspiration atomic absorption are the following...
Method for determining aluminum content by graphite furnace atomic absorption spectrometry
ActiveCN116793971BPreparing sample for investigationColor/spectral properties measurementsMetal nitrateSample water
The application provides a method for determining the content of aluminum by graphite furnace atomic absorption spectrometry. The method comprises the following steps: preparing an aluminum series calibration solution added with an alkali metal nitrate, determining the absorbance of the solution by using a graphite furnace atomic absorption spectrometer, and then drawing a standard curve with the determined absorbance as the ordinate and the content of aluminum in the aluminum series calibration solution added with the alkali metal nitrate as the abscissa; adding the alkali metal nitrate into a sample to be determined, determining the absorbance of the sample by using the graphite furnace atomic absorption spectrometer, and then calculating the content of aluminum in the sample to be determined according to the standard curve. The method can fully atomize the aluminum element, improve the measurement accuracy, and solve the problem of different atomization rates of sample water and calibration solution, and mask the interference of other metal oxides.
Owner:ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID JIBEI ELECTRIC POWER CO LTD +1
Analysis method for measuring content of cesium element in crizotinib starting material
PendingCN120102480APreparing sample for investigationColor/spectral properties measurementsHigh concentrationGraphite
The invention discloses an analysis and detection method for determining the content of a cesium element in a crizotinib starting material based on graphite furnace atomic absorption spectrometry without adding a matrix modifier. 2% nitric acid aqueous solution is used as a solvent, is economical, practical and environment-friendly, shortens experimental time and improves efficiency; a sample is dissolved, substrate interference is reduced, and the service life of an atomic absorption instrument is prolonged; the use of high-precision instruments is more efficient and environment-friendly; in the subsequent method development, the method can be used for reference for detection items with low limit and high concentration of a test solution.
Owner:JIANGSU WANBANG BIOPHARMLS +1
A detection method for separating, enriching and desorbing lead ions in table salt based on diatomite
ActiveCN114705642BPreparing sample for investigationColor/spectral properties measurementsOrganic solventLaboratory test
This case involves a detection method for separating, enriching and desorbing lead ions in table salt based on diatomaceous earth, including enrichment and desorption: the lead ions in table salt are separated and enriched under alkaline conditions, then desorbed under acidic conditions, and then the collected desorbed solution is detected by a graphite furnace atomic absorption spectrometer, and the concentration of lead ions in the sample is converted by the standard curve method. This case is based on the common reagent diatomaceous earth, and the enrichment and desorption of lead ions in table salt can be completed without chemical modification, greatly reducing the matrix interference problem, being able to accurately determine the content of lead ions in table salt, with relatively high method sensitivity and recovery rate; the operation steps are simple, greatly simplifying the detection steps of lead ions in table salt, and can effectively improve the analysis efficiency, being conducive to the analysis and detection of batch samples; being conducive to popularization and application in daily laboratory tests; the method described in the present invention uses low-cost reagents, does not require organic solvents to participate, and does not introduce other metal ions, having the advantages of environmental friendliness.
Owner:YANGZHOU FOOD & DRUG INSPECTION & TESTING CENT
Method for detecting heavy metals in animal-derived food
InactiveCN121231399APreparing sample for investigationColor/spectral properties measurementsFood safetyDigestion
The invention provides a method for detecting heavy metals in animal-derived food, and belongs to the technical field of analytical chemistry and food safety detection. The detection method comprises the following steps: respectively preparing standard working solutions by using standard stock solutions of lead, cadmium and chromium, measuring absorbance by adopting a graphite furnace atomic absorption spectrometry, and drawing a standard curve; the method comprises the following steps: pre-digesting a sample, then adding premium-grade pure hydrogen peroxide, carrying out microwave digestion to obtain a digestion solution, and carrying out acid removal treatment on the digestion solution to obtain a sample solution to be detected; and detecting the absorbance value of the to-be-detected sample solution by adopting a graphite furnace atomic absorption spectrometry, and calculating the contents of lead, cadmium and chromium in the to-be-detected sample solution according to the standard curve. The detection method disclosed by the invention is efficient in pretreatment, strong in anti-interference capability and high in sensitivity, accuracy and precision.
Owner:MEISHAN VOCATIONAL & TECH COLLEGE (MEISHAN TECHNICIAN COLLEGE)
A method for determining the content of aluminum by graphite furnace atomic absorption spectrometry using elemental silver melting interference
ActiveCN116754500BPreparing sample for investigationColor/spectral properties measurementsSample waterPhysical chemistry
The application provides a method for determining the content of aluminum by graphite furnace atomic absorption spectrometry by using single silver melting interference. The method comprises the following steps: preparing an aluminum series calibration solution added with silver nitrate, determining the absorbance by using a graphite furnace atomic absorption spectrometer, then taking the determined absorbance as the ordinate and the content of aluminum in the aluminum series calibration solution added with silver nitrate as the abscissa to draw a standard curve; adding silver nitrate into a sample to be determined, determining the absorbance by using the graphite furnace atomic absorption spectrometer, and then calculating the content of aluminum in the sample to be determined according to the standard curve. The method can fully atomize the aluminum element, improve the measurement accuracy, solve the problem of different atomization rates of sample water and calibration solution, and mask the interference of other metal oxides.
Owner:NORTH CHINA ELECTRICAL POWER RES INST +1
An automatic detection device for lead and chromium dissolution in ceramics
The present invention discloses an automatic detection device for the amount of lead and chromium dissolution from ceramics, comprising a housing and a graphite furnace atomic absorption spectrometer disposed on the housing. The graphite furnace atomizer comprises a graphite tube with a sampling hole formed in the graphite tube. The apparatus also comprises a sample storage mechanism and a sampling mechanism disposed on the housing. The sample storage mechanism comprises a rotary drive unit and a sample storage container, the sample storage container being provided with a plurality of sample storage portions along a circumferential direction. The sampling mechanism comprises a guide frame fixedly mounted on the housing and a mobile sampler. The mobile sampler is driven by the motion drive unit to reciprocate along the guide frame and has a sampling working position and a liquid adding working position. The automatic detection device for the amount of lead and chromium dissolution from ceramics provided by the present invention can sample a sample solution in the sample storage container by means of the mobile sampler, and add the sample solution from the sampling hole into the graphite tube, thereby achieving automatic sampling and adding, and reducing the labor intensity of the staff.
Owner:NINGXIA BEIFU TECH CO LTD
A method for correcting matrix effect of graphite furnace atomic absorption method
ActiveCN114660007BPreparing sample for investigationColor/spectral properties measurementsHigh concentrationOptical spectrometer
The application provides a correction method for matrix effect of graphite furnace atomic absorption method, comprising the following steps: checking the absorbance-time real-time signal of the highest concentration value of a standard curve according to a preset temperature rising program; if the absorbance-real-time signal is not ideal, optimizing the temperature rising program by using a sample to be measured to obtain an optimized temperature rising program; detecting the absorbance corresponding to the concentration point on the standard curve according to the optimized temperature rising program to obtain a standard curve; testing the standard curve; detecting the sample to be measured by using the standard curve method, correcting by using parallel samples and testing whether there is interference of matrix effect. In the application, the molecular absorption interference and light scattering interference phenomenon caused by the matrix effect can be partially displayed in the real-time signal of the graphite furnace atomic absorption spectrometer, and can be corrected and eliminated by optimizing the graphite furnace temperature rising program or combining the dilution enrichment program and the parallel sample detection method.
Owner:CHINA NORTHEAST MUNICIPAL ENGINEERING DESIGN AND RESEARCH INSTITUTE CO LTD
Graphite furnace atomic absorption spectrometer
The utility model relates to the technical field of analysis equipment, and provides a graphite furnace atomic absorption spectrometer which comprises a spectrometer main body and an automatic sampling device arranged on the spectrometer main body, the automatic sampling device comprises a rotating shaft which is rotatably arranged on the spectrometer main body through a rotating device, and a sample placing disc which is detachably connected with the rotating shaft through a quick release device.
Owner:QUANZHOU YIHE FOOD RES INST CO LTD
Method for measuring thallium content in nickel sulfate product by graphite furnace atomic absorption method
The invention relates to the technical field of chemical analysis, in particular to a method for measuring thallium content in a nickel sulfate product by a graphite furnace atomic absorption method, which comprises the following steps: optimizing test conditions, preparing a standard solution and drawing a standard curve; weighing a nickel sulfate sample, and dissolving to obtain a green and transparent nickel sulfate sample solution; taking the nickel sulfate sample solution into an automatic sample injection cup, measuring the absorbance of the sample under the set condition of an instrument by using a graphite furnace atomic absorption spectrometer, and automatically calculating the concentration value of thallium in the nickel sulfate sample according to the drawn standard curve instrument; and calculating the content of thallium in the sample according to the weight of the weighed sample and the constant volume. According to the graphite furnace atomic absorption method, the thallium content in the nickel sulfate product can be efficiently and accurately measured. The method has the advantages of high sensitivity, low detection limit, simplicity in operation, low detection cost, wide detection range and wide applicability.
Owner:JINCHUAN GRP NICKEL SALTS CO LTD
Graphite furnace atomic absorption spectrophotometer
ActiveCN224081492UEasy to assembleeasy maintenanceColor/spectral properties measurementsFurnace coolingThermodynamicsCombustor
The utility model discloses a graphite furnace atomic absorption spectrophotometer, which comprises a shell and a flame atomizer, the shell is provided with a movable door capable of being opened and closed, the movable door is detachably connected with a heat dissipation mechanism, the heat dissipation mechanism comprises a heat dissipation frame, a protective cover, an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe are oppositely installed on the front face and the back face of the protective cover, the heat dissipation frame is arranged in the shell, and the protective cover is connected and fixed to the movable door in an inserted mode. According to the flame graphite furnace, through the arranged heat dissipation mechanism, heat dissipation can be conveniently carried out on a combustion area in the flame graphite furnace, a combustor in the flame atomizer is prevented from damaging a shell of the photometer, through the protective cover, the air inlet pipe and the air outlet pipe, dissipation of the temperature above the combustor can be conveniently accelerated, and meanwhile through the detachable heat dissipation mechanism, the heat dissipation efficiency is improved. And the atomic absorption spectrophotometer can be conveniently assembled with the spectrophotometer and the heat dissipation mechanism can be conveniently maintained, so that the atomic absorption spectrophotometer has heat dissipation and protection effects.
Owner:EASTO (WUHAN) BIO-TECH CO LTD
Method for the preparation of 7-(5-nitro-4-methyl-2-pyridylazo)-8-hydroxyquinoline and its use in the detection of trace amounts of platinum
This invention discloses a method for preparing 7-(5-nitro-4-methyl-2-pyridineazo)-8-hydroxyquinoline and its application in the detection of trace platinum. The preparation method includes the following steps: (1) preparing 5-nitro-4-methyl-2-aminopyridine diazonium salt; (2) preparing 7-(5-nitro-4-methyl-2-pyridineazo)-8-hydroxyquinoline. 7-(5-nitro-4-methyl-2-pyridineazo)-8-hydroxyquinoline, as a chelating agent, reacts with platinum in water to form a hydrophobic chelate. Then, ionic liquid extraction is used. The extract phase does not need to be diluted and can be directly used for the determination of platinum in water by graphite furnace atomic absorption spectrometry. This solves the defects of ionic liquids, which are viscous and difficult to transfer directly or easily adsorbed on instrument components. The operation steps are simplified by eliminating the need for dilution. At the same time, the detection method provided by this invention is convenient to operate and has high precision.
Owner:XIAN UNVERSITY OF ARTS & SCI