125 results about "Atomic emission spectroscopy" patented technology

The invention discloses a coal quality characteristic analysis method based on combination of dominant factors and a partial least square method, and belongs to the technical field of atomic emission spectroscopy. According to the method, modeling is carried out based on a physical background of coal quality characteristics. The method comprises two steps of partial least square fitting processes. In the first partial least square fitting process, characteristic lines in a spectrum relative to coal quality characteristics are used as inputs, and a nonlinear dominant factor model is established for describing a physical relationship between coal quality characteristics and laser-induced breakdown spectroscopy. In the second partial least square fitting process, dominant factor residuals are corrected by using all spectral line intensity information of the spectrum. Compared with a traditional partial least square model, with the method provided by the invention, model calibration and prediction precisions are improved.

The invention discloses a method for a short chain olefin hydrocarbon through an ethylene oligomeric. The invention is characterized in that: the dual salicylaldehyde imine nickel catalyst is loaded in imidazole Al-ionic ionic liquid; under the assistant catalysis of AlEt2Cl, the ethylene oligosaccharide can be catalyzed in two phase in a mild reaction condition. Comparing with a homogeneous system, the activity of the catalyst system in the ionic liquid can be improved greatly; all generative products are ethylene oligomeric, and the production can be separated through a simple settlement. The ionic liquid of the catalyst can be recycled by being dissolved. The reaction condition has no great impact to the distribution of the oligomeric production. The test result of gas chromatography mass spectrum that the ethylene oligomeric production mainly is a short chain olefin hydrocarbon with the carbon atom of less than 10. Compared with the tradition of salicylaldehyde imine nickel catalyst 1 and 2, the catalyst 3 and 4 after the ion function has a higher activity and a better thermal stability. The test for atomic emission spectroscopy of the plasma shows that the recovery rate of catalyst 1 and 2 can be more than 98 percent, while that of the catalyst 3 and 4 after the ion function can reach 99.9 percent.

Multiple energy sources, such as a laser and electrical current, are employed, in close coordination, spatially and temporally, to clean a sample, vaporize its material and excite vapor atoms for the purpose of atomic emission spectroscopy. These methods permit better monitoring and control of the individual processes in real time, lead to higher consistency and higher quality optical emission spectra, and enhance the measurements of non-conducting solids, liquids and gases. Additionally, a portable instrument is provided with both laser source and spectrometer optically coupled to a hand-holdable unit.

A hand-held, self-contained, battery-powered test instrument for analyzing composition of a sample includes an exciter for exciting at least a portion of the sample, a compact cross-dispersed spectrometer for receiving an optical signal from the excited portion of the sample and a processor for processing spectral data about the optical signal from the spectrometer. The exciter may include a spark generator and a counter electrode, a laser or other device for generating the optical signal from the sample portion. The spectrometer has a wavelength range broad enough to enable the test instrument to detect and determine relative quantities of carbon, phosphorous, sulfur, manganese, silicon, iron and other elements necessary to identify common alloys. The spectrometer includes a structural member made of a light-weight material having a small coefficient of thermal expansion (CTE). The spectrometer is dimensionally stable over a range of expected ambient temperatures, without controlling the temperature of the spectrometer.

The invention provides a digestion method and a detection method of iron ore. The digestion method comprises the following steps of: performing closed-vessel microwave-assisted digestion on iron ore samples mixed with hydrofluoric acid and sulfuric acid to form suspension; and heating the suspension in an opened system to perform digestion for the second time by using the residual sulfuric acid so as to obtain completely digested solution. The detection method comprises the step of detecting solution to be tested, which is prepared from the digested solution by a detection method such as inductive coupled plasma atomic emission spectroscopy so as to obtain the content of each element of the iron ore. The digestion method and the detection method have the characteristics of high efficiency, simpleness, quickness and accuracy; and particularly, the key elements, such as As, Pb, Zn, W, Sn, Ca, Mg, Cu, Co, Ni, Cr, Mo and the like, of the iron ore can be detected accurately, wherein the key elements can influence the quality of products prepared by the processes such as iron and steel smelting, vanadium extraction, titanium extraction and the like.

The invention discloses a method for measuring the content of powdery substantial elements based on laser-induced breakdown spectroscopy, belonging to the field of atomic emission spectroscopy. characterized in that: a powdery sample is put on a transparent glass pallet, laser is focused onto the bottom of the powder through the glass pallet to generate plasmas, radiant light signals emitted by the plasmas pass through the glass pallet and are collected by a collecting lens arranged below the glass pallet, and the collected radiant light signals are transmitted to a spectrometer through optical fibers for analyzing. According to the invention, there in no need of compression molding of the powdery sample, thus the speed of on-line detection is raised; in addition, the measuring signal fluctuation caused by the unevenness of the powder layer surface is overcome, and the repeatability of the measurement is raised.

The invention relates to a method for rapidly and simultaneously determining the content of six elements in chromite by microwave digestion-ICP (Inductively Coupled Plasma)-AES (Atomic Emission Spectroscopy). A test sample is pretreated through microwave digestion by taking hydrochloric acid, nitric acid and sulfuric acid as a digestion agent; in order to correct physical interferences and ionization interferences, Si, Mg and Fe are corrected by adopting Y242.220 horizontal low wave and Al, Ca and Cr are corrected by adopting Y371.030 horizontal high wave; and an interior label mixing pipe is added online so as to ensure accurate and stable flow. The method is established on an ICP instrument; the content of elements including SiO2, Al2O3, CaO, MgO, Fe and Cr2O3 in a sample is calculated through a standard curve method; and the precision, accuracy and recycling ate of the method are verified by standard reference materials. According to the method, the pre-treatment of the sample is simple and loss and pollution of the elements in a sample decomposition process are avoided; the established method is rapid, accurate and reliable and the problems of an existing method for simultaneously determining the six elements in the chromite that the process is complicated, the operation is tedious and complicated, the period is long and the accuracy is poor are solved; and new references are provided for detection and analysis of the content of the six elements in the chromite.

The invention relates to the technical field of atomic emission spectroscopy, and in particular relates to a laser defocusing amount automatic adjusting device on the micrometer scale and an adjustingmethod thereof. The device comprises a laser pen. A beam shaping system and a beam splitter are arranged on a central axis of the laser pen which emits a laser beam. The angle between the beam splitter and the laser beam of the laser pen is 45 degree. The upper and lower sides of the beam splitter are provided with a microscopic imaging optical system for observing the surface topography of the sample and detecting the laser spot of the sample surface. A three-dimensional stage for carrying a sample is disposed under the microscopic imaging optical system, and the microscopic imaging opticalsystem and the three-dimensional stage are electrically connected to a control host. The microscopic imaging optical system comprises a CCD camera and a microscope objective located on the upper and lower sides of the beam splitter. According to the laser defocusing amount automatic adjusting device on micrometer scale and adjusting method thereof, the CCD camera can be used to acquire and judge images in real time, and the laser defocusing amount is corrected in real time, which has great significance for ensuring the consistency of the plasma morphology on the sample.

The invention provides an analysis method for impurity elements in tin-oxide-containing nanopowder, and aims to solve the problem that the tin-oxide-containing nanopowder is not easy to decompose by adopting an inductive coupling plasma atomic emission spectroscopy method and selecting the reagent type, dosage and method adopted for the dissolving sample of the tin-oxide-containing nanopowder; experiment interference is eliminated by selecting acid conditions and instrument parameters, thereby solving the difficulties that tin and antimony are easy to hydrolyze, interference elements are more and difficult to test and test background value is high and the like; with the method, the detection limit is below 0.003%, the relative standard deviation is within 10%, the method correlation coefficient is above 0.998, and the recovery rate is between 85% and 130%; and the analysis speed is high, the data is accurate, the errors meet conventional requirements, and the quality and the performance stability of the tin-oxide-containing nanopowder can be ensured.

The invention discloses a plasma atomic emission spectroscopy analysis method and a plasma atomic emission spectroscopy analysis apparatus using gaseous sample injection. The method comprises: separating matrix interference by using gaseous sample injection and improving detection sensitivity, using plasma excited elements to produce spectra, and using one or more optical filters for further eliminating spectral interference and using a photoelectric detector to detect element spectra. The apparatus comprises: an elemental volatile generation and separation apparatus 1, a plasma forming apparatus 2, an optical filter apparatus 3 and a detection apparatus 4. A grating is not used in the apparatus as a spectral element. By using the elemental volatile generation and separation apparatus and one or more optical filters at the same time to selectively detect elements, the detection is high in sensitivity. The analysis apparatus has the advantages of simple structure and low price.

The invention discloses an arc heater water leakage fault diagnosis system based on atomic emission spectroscopy. The air is heated by an arc heater and expanded and accelerated by an effuser to formhigh temperature air flow. The flow field spectrum formed by the arc heater is focused by a spectrometric compression film. The focused flow field spectrum is transmitted to a spectral measurement module through an optical fiber. The spectral intensity of the oxygen atomic characteristic spectrum and the spectral intensity of the background spectrum are measured by using the spectral measurement module and then the relative intensity is calculated. The relative intensity is compared with the intensity threshold by a data processing terminal, and the water leakage fault of the arc heater is judged according to the comparison result. When the judgment result indicates water leakage, power supply to the arc heater is disconnected. Rapid diagnosis of the low enthalpy arc heater water leakage fault can be realized so that safe operation of the heater can be guaranteed; and the operation state of the heater can also be monitored in real time so as to provide reference to analysis of the long-term operation stability.

The invention provides a method for improving carbon content measuring accuracy in steel, and belongs to the technical field of atomic emission spectroscopy measurement. The method comprises the following steps of puncturing a steel sample by using an ultraviolet band laser to obtain a characteristic spectrum, and fitting a function relationship of the intensities of a carbon atom spectral line and a carbon molecular spectra line and the carbon content; and correcting a residual error of the carbon content after fitting by using a partial least square method so as to obtain a calibration model of the carbon content. The method provided by the invention has the advantages that the ablation efficiency is improved by adopting the ultraviolet band laser, and a measuring signal is effectively strengthened; the information contained in a spectroscopy is fully utilized to establish the calibration model by correcting the residual error, and thus the detection limit of carbon in the steel is reduced and the measuring accuracy is improved.

The invention discloses a preparation method of a silver-loaded activated carbon and application thereof to tap water purification treatment. The method comprises steps of: preparing a silver nitrate solution with a concentration of 100-1000 milligram / liter; mixing the silver nitrate solution and cleaned granular active carbon in a mass ratio of silver to charcoal being 0.1-0.5:100 and reactingwith stirring for 12-48 h at 5-50 DEG C to obtain silver ion adsorbed active carbon; heating the silver ion adsorbed active carbon at 400-500 DEG C for 4-5 h and depriving small particle size silver ion adsorbed active carbon through a 50 mesh screen to obtain the silver-loaded activated carbon. The preparation method of the invention realizes active carbon loaded with 0.1-1% of silver and a silver utilization rate exceeding 99.6%. High temperature treated silver-loaded activated carbon is used for treating tap water for 60 days, and the treated tap water contains no silver ion according to atomic emission spectroscopy analysis; and silver ion can be detected in tap water treated with activated carbon, which is not treated by high temperature in first two week detection. Accordingly, the silver-loaded activated carbon is suitable for being applied to tap water purification treatment.

Fumed silica for use as auxiliary substance in pharmaceutical and cosmetic compositions, which has - a BET surface area of 90 to 400 m<2>/g - a content of As, Cd, Cr, Pb, Sb and Se of less than 1 ppm for each element and less than 5 ppm of Hg, all elements determined by Inductively Coupled Plasma - Atomic Emission Spectroscopy (ICP-AES) or Atomic Absorption Spectroscopy (AAS).

The invention discloses a method and an apparatus for measuring material thermal conductivities based on optical-modulated thermo-emission spectroscopy. The apparatus comprises a Fourier transform infrared (FTIR) spectroscopy measuring system, a laser served as a heat source, a lock-in amplifier for connecting a detector and a circuit controlling panel in the FTIR spectrometer, and a chopper positioned on the optical path between a sample/power testing system and the laser. With the apparatus, optical-modulated thermo-emission spectroscopy measuring can be carried out, temperatures of a sample before and after laser radiation can be accurately determined, such that the thermal conductivity of the sample can be obtained. With advantages of fast, non-contacting, and convenient, the apparatus provided by the present invention is suitable for the detection of thermal characteristics of photovoitaic semiconductors.

The invention provides an analysis device for detecting multiple anions simultaneously. The analysis device comprises an ion chromatography separating system and a liquid cathode glow discharge atomic emission spectroscopy detecting system. The ion chromatography separating system comprises a chromatographic pump for conveying a mobile phase, a leacheate generator, a six-way injection valve, a guard column, a separation column, an ion suppressor and a cation exchange column. The liquid cathode glow discharge atomic emission spectroscopy detecting system comprises a sample injection unit, a light source generating part generating glow discharge, a light split unit for carrying out light splitting treatment on a glow discharge emission spectrum, a detecting unit for detecting the emission spectrum obtained after light splitting treatment, and a data processing unit for analyzing data generated by the detecting unit. The ion chromatography separating system and the liquid cathode glow discharge atomic emission spectroscopy detecting system are combined for use, the analyzing process comprises separation of anions, conductive background suppression and ion conversion, the overall structure is simple, the performance is stable, and the price is low.

The invention discloses a gas chromatographic detection method for determining a carbon-containing compound based on carbon atomic emission spectroscopy. A dielectric barrier discharge (DBD) device is used as an atomizer and an excitation source of a carbon element in the carbon-containing compound, 193.0nm is selected as a detection wavelength, a charge-coupled device is used for quantitative detection, and detection sensitivity is improved by adopting an auxiliary heating method. The method has the characteristics of high selectivity, high analysis speed, high stability and the like for the detection of the carbon element.

The invention provides a pre-concentration tandem arrangement for measuring zinc by emission spectroscopy and an analysis method, and the pre-concentration tandem arrangement comprises a tungsten pre-concentration device, an electrothermal vaporization device, a torch interface, a carrier gas mass flowmeter, an auxiliary gas mass flowmeter, a diverter three-way, a converging three-way, a carrier gas channel, an auxiliary gas channel and the like. An inductively coupled plasma emission spectrometry for measuring solid sampling of the zinc comprises the steps of dehydrating and ashing a sample to be measured in air to obtain inorganic residues; heating the sample residues at about 1600 DEG C under an argon hydrogen mixture atmosphere, the evaporated aerosol containing zinc atoms contacts with tungsten filament, and the zinc is pre-concentrated by the tungsten filament; heating the temperature of the tungsten filament to be about 1800 DEG C, releasing the zinc atoms, and analyzing the content of the zinc by the inductive coupling plasma emission spectrograph. The pre-concentration tandem arrangement has a simple structure and the problems that a plasma torch is extinguished and a signal is unstable when the tungsten pre-concentration device and the electrothermal vaporization device are in combination with the inductively coupled plasma emission spectrometry are solved. The pre-concentration tandem arrangement has the advantages that the digestion treatment is not needed to be performed on the sample, the trace zinc in the sample can be measured, and the pre-concentration tandem arrangement has the characteristics such as being direct, speediness, high sensitivity and good stability.

The invention relates to the technical field of water detection and in particular relates to a device and a method for measuring chlorine elements in water in real time. The device comprises a water supply unit, a detection chamber, a laser driving unit, a spectra collection unit and a system control unit, wherein the water supply unit is communicated with the detection chamber; a laser transmitting head and a spectra receiving head are arranged in the detection chamber; the laser driving unit is connected with the laser transmitting head; the spectra collection unit is connected with the spectra receiving head; and the system control unit is connected with the laser driving unit and the spectra collection unit. The method comprises the following steps: directly introducing a to-be-measured water body into the detection chamber, exciting chlorine elements in the water body into a plasma state by utilizing high-energy laser, measuring the atomic emission spectroscopy, and measuring the chlorine elements in the water by virtue of the atomic characteristic spectrum of the chlorine elements. According to the method, manual sampling is not needed, pretreatment is avoided, the total chlorine content in the water can be rapidly measured, real-time measurement can be realized, high sensitivity is achieved, secondary pollution is avoided, and the operation is simple and rapid.

Characters of the method are that first removing organic substances; next, using aqua regia to dissolve sample of material processed above; then, driving away acids in low melting point; using method of inductive coupling plasma atomic emission spectroscopy (ICP-AES) to analyze other components in the solution processed above. Features are: high adaptability less investment, easy of analysis, high accuracy.

The invention provides a method for detecting components of an industrial ammonium sulfate product. The method comprises the following steps: digesting a sample by using a diluted hydrochloric acid solution so as to form a solution to be detected; simultaneously determining the content of nitrogen, sulfur and impurity elements in the solution to be detected by adopting inductive coupling plasma atomic emission spectroscopy; respectively calculating to obtain the content of ammonium and ammonium sulfate in the sample according to the content of nitrogen and molecular formulas of ammonium and ammonium sulfate, calculating to obtain the content of sulfate radicals in ammonium sulfate molecules according to the content of ammonium sulfate in the sample and the molecular formula of the ammonium sulfate, calculating to obtain the content of total sulfate radicals in the sample according to the content of sulfur and the molecular formula of the sulfate radicals, and subtracting the content of the sulfate radicals in ammonium sulfate molecules from the content of the total sulfate radicals by minusing, thus obtaining the content of free sulfuric acid in the sample. The method has the advantages that the content of the ammonium, ammonium sulfate, free sulfuric acid and the impurity elements such as iron, lead, arsenic and chromium in the ammonium sulfate product can be simultaneously determined at a time, the accuracy is high, and the determination process has high efficiency and is fast.

The invention relates to a method for measuring molten salt chloride residues and recycling chemical components in regenerated substances, and belongs to the technical field of detection analysis of element component content. The method comprises the following steps: weighing a to-be-measured sample, dissolving the to-be-measured sample with a dilute nitric acid solution, adding water to dilute in a special solid-liquid dilution ratio to form a to-be-measured solution; and then, measuring the content of chemical elements such as potassium, iron, magnesium, manganese, calcium, chromium, nickel, vanadium, titanium, copper and lead in the to-be-measured solution through an inductive coupling plasma atomic emission spectroscopy. The method disclosed by the invention can be used for simultaneously obtaining the contents of molten salt chloride residues and the chemical element components in the recycled generated substance sample by one step, simple, quick, few in operation step, few in disturbing influence factor, high in measuring efficiency for the substrate components and trace impurities, short in inspection period and low in analysis cost.

The invention discloses a method for quickly measuring ultra-low carbon and ultra-low sulfur in steel by the atomic emission spectrometry, which comprises the following steps of: (1) preparing a spectrum sample control demo by an ultra-low carbon and ultra-low sulfur steel billet, and carrying out a homogeneity test on the prepared spectrum sample control demo on an atomic emission spectrometer; (2) preparing the spectrum sample control demo into a steel scrap sample on a drilling machine, and valuing the content of carbon and sulfur in the steel scrap sample of the drilled steel scrap sample by a corrected infrared carbon sulfur instrument; (3) regulating the atomic emission spectrometer before the atomic emission spectrometer is used, and correcting by a valued spectrum control sample after a working curve is corrected; and (4) preparing an analysis sample with a milling method, and detecting by the corrected atomic emission spectrometer to measure the content of the ultra-low carbon and the ultra-low sulfur in the analysis sample. The method is combined with the characteristic of high accuracy of an infrared absorption method, and stokehole steelmaking ultra-low carbon and ultra-low sulfur can be quickly and accurately measured in a mode of valuing the spectrum control sample with the infrared absorption method.