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6 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
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
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 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