93 results about "Hollow-cathode lamp" patented technology

The invention relates to a test method of steel, in particular to a test method of a micro amount of arsenic or antimony in steel. The test method is based on a principle of a flow injection-hydride generation-atomic absorption spectroscopic methodology, and experiments are determined in a flow-injection sample-injection mode. The method comprises the following steps: a test solution is reduced bya thiourea-ascorbic acid mixed solution and a hydrochloric acid solution to convert arsenic (V) into arsenic (III), and convert antimony (V) into antimony (III); the test solution reacts with a potassium borohydride solution under a carrier band of a carrier solution to generate a great amount of nascent oxygen which reacts with the arsenic (III) or the antimony (III) to generate gaseous AsH3 orSbH3; the AsH3 or the SbH3 is led into a specially-designed quartz tube by high-purity argon gas as carrier gas and is atomized into ground-state atomic vapor; ground-state electrons which are on theoutermost layer of the atom are excited by the light energy of a light source of a hollow cathode lamp to transit to a high energy level; and the amount of abortion light intensity is directly proportional to the concentration of the atom. Accordingly, the arsenic or antimony content in the test solution can be quantitatively analyzed.

The invention relates to ultraviolet ray intensity detecting method and device. The method includes the following steps: collimating ultraviolet ray containing light by two rectangular diaphragms to form one way right parallel ray and reflect to grating; the first level optical spectrum of the reflected diffracted light is from ultraviolet ray, visible light, to infrared ray; the visible light and the infrared ray are turned back by one light filtering device; the ultraviolet ray is passed through and shot to ultraviolet luminescent material to give out fluorescent light; using electro-optical signal acquisition circuit includes photo detector to detect the fluorescent light intensity; converting to ultraviolet ray intensity. The invention can be used in sun ray ultraviolet ray detecting, varieties of ultraviolet light sources such as mercury lamp, xenon lamp, and deuterium lamp, and hollow cathode lamp measuring. It has the advantages of compact design, simple using, convenient carrying, and wide detecting range.

A device for injecting ions into the inner surface of a hollow cathode coupling positive bias pipe and a method thereof relate to a method for injecting ions into the inner surface of a pipe and a device thereof. The invention solves the problem of difficult plasma generation in a relatively thin pipe. The device is structurally characterized in that one end of a hollow cathode tube (9) is installed in a workpiece pipe (10); the positive pole of a high-voltage impulse power source (7) is connected to the hollow cathode tube (9) through a low pass filter (6); and a radio-frequency power supply system (3) is connected to the hollow cathode tube (9) through a matching protection circuit (4). The method comprises the following steps of that a gas generates plasmas in the hollow cathode tube under the effect of radio-frequency pulse; and the plasmas fly to the inner walls of the workpiece pipe (10) to form the plasma injection under the effect of the electric field. The invention has the advantages that the diameter\ of the workpiece pipe to be processed is reduced and the generation of plasmas get easier through putting the hollow cathode tube in the workpiece; and the plasma injection rate on the inner surface of the workpiece pipe is increased through locating the hollow cathode tube on impulse positive bias.

The wide-range deuterium lamp background correcting system includes hollow cathode lamp, deuterium lamp, front lens, burner, back lens, monochromator, photomultiplier and signal detecting processor, as well as half-reflecting mirror, which is located in front of the front lens and driven with a stepped motor for compounding the deuterium lamp and the hollow cathode lamp. The deuterium lamp is pulse powered, and the signal detecting processor controls the stepped motor and the adjustable deuterium lamp pulse current automatically. Owing to the combination of the half-reflecting mirror and the current adjustable high strength deuterium lamp and the program controlled energy balance, the deuterium lamp background correction for atomic absorption spectrophotometer may be expanded to element Cs with longest wavelength of 852.1 nm. In addition, the system has long term high precision, high repeatability and fast correction speed.

The invention discloses an asymmetric spatial heterodyne spectrometer wind speed measurement calibration device and an asymmetric spatial heterodyne spectrometer wind speed measurement calibration method. The asymmetric spatial heterodyne spectrometer wind speed measurement calibration device comprises two hollow cathode lamp light sources, a beam splitter, a wind speed simulator, an asymmetric spatial heterodyne spectrometer, an imaging lens and a detector. On one hand, a reference light source is introduced into a system, thereby forming interference of mixed light beam; and on the other hand, an interferogram sequence with no frequency shift and an interferogram sequence with certain frequency shift are periodically measured. Phase sequences which correspond with a signal light source and a reference light source are respectively calculated, thereby deducting influence of system error to a phase signal, averaging the processed phase sequences and calculating a difference between the processed phase sequences, calculating an effective phase frequency shift of the signal light source, and accurately obtaining the wind speed through reverse deduction. In laboratory measurement, the asymmetric spatial heterodyne spectrometer wind speed measurement calibration device and the asymmetric spatial heterodyne spectrometer wind speed measurement calibration method have advantages of high stability, high reliability, simple system, easy realization, and high-precision air speed deduction result.

The invention discloses a method of determining silver content in rock minerals. The method comprises the following steps: preparing a silver standard storage solution; preparing a silver standard solution; determining absorbance of the silver standard storage solution by using an atomic absorption spectrometer and a silver hollow cathode lamp and drawing a working curve; taking a sample; adding nitric acid, hydrochloric acid, hydrogen peroxide, an ammonium fluoride solution and a sodium chlorate solution, carrying out microwave digestion, heating and drying an obtained mixed solution with steam, adding hydrochloric acid and nitric acid, dissolving solids, transferring an obtained solution to a volumetric flask, diluting the solution with distilled water until the liquid level of the solution reaches a scale mark, shaking up the solution, determining absorbance of silver in the obtained sample solution by using the atomic absorption spectrometer and the silver hollow cathode lamp, carrying out blank tests on associated samples, and calculating the concentration of silver in the sample according to a formula. The invention has the advantages of convenience, fastness, a small usage amount of reagents, low cost for determination and no discharge of a great amount of acid gas, is favorable for protecting environment and health of operational personnel, avoids loss of the sample inthe sample solution, enables precision of analysis to be enhanced, labor intensity to be reduced, time to be saved and work efficiency to be improved, and has a wide application scope.

The invention relates to a special high-voltage power supply of a zinc element hollow cathode lamp, which comprises a power supply circuit, wherein the power supply circuit is installed in a shell, and connectors and a connector state indicating lamp are welded on the power supply circuit; the power supply circuit forms a closed loop circuit by an auxiliary circuit, a prestabilizing control circuit, a prestabilizing drive circuit, an output control and feedback circuit and an output drive and output circuit; and the prestabilizing control circuit is connected with the prestabilizing drive circuit. The overall unit has the internal adjustment and external monitoring function on an anode current (a lamp current), good long-term stability, small temperature drift, high reliability, compact structure, small overall dimension relative to similar units, lighter weight and easy installation; and the output anode current has small ripple wave and high stabilized current precision.

The invention provides a four-quadrant detector-based auxiliary system and a four-quadrant detector-based auxiliary method for an atomic fluorescence hollow cathode lamp. According to the auxiliary system, an auxiliary lens and a four-quadrant detector are arranged behind an observation point, so that light convergent at the observation point forms light spots on the four-quadrant detector after passing through the auxiliary lens. The four-quadrant detector is connected with a control system through a signal processing circuit. The control system is also connected with the hollow cathode lamp. The auxiliary system can be used for performing light path alignment and light source drift correction on the atomic fluorescence hollow cathode lamp. The system and the method are high in light path alignment accuracy and repeatability, can be used for automatically monitoring and correcting light source drift, and have broad application prospect in the technical field of atomic fluorescence analysis, in particular in the fields of automatic focusing and light source drift correction of the hollow cathode lamp, and the like.

The invention relates to a method for quantitative determination of sulphite, particularly to a method of measuring content of sulphite in water. A method of measuring content of sulphite in water through gas phase molecular absorption spectrometry, including a gas phase molecular absorption spectrometer, comprises the following steps: step 1 of converting sulphite into gaseous sulfur dioxide; step 2 of using zinc hollow cathode lamp as excitation source, measuring molecular absorption intensity of sulfur dioxide at wavelength 202.6 nm, thereby performing quantitative analysis on sulphite. The inventive method of using measuring content of sulphite in water through gas phase molecular absorption spectrometry has convenient operation, fast analysis speed and small environmental pollution.

The invention discloses a hollow cathode lamp and an atomic absorption spectrometer manufactured by the hollow cathode lamp. The hollow cathode lamp comprises a plurality of hollow cathode lamp filaments, wherein each hollow cathode lamp filament is made of alloy; the hollow cathode lamp filaments on the hollow cathode lamp are made of different kinds of alloy, and each alloy contains multiple elements; the plurality of hollow cathode lamp filaments are arranged on the same optical principal axis equidistantly; and a plurality of hollow anode rings are inserted among the plurality of hollow cathode lamp filaments. The atomic absorption spectrometer with the hollow cathode lamp consists of a concave surface reflector, a seam-in concave surface reflector, a flame or graphite furnace center,a flat field concave surface grating and a diode array detector. The invention has the advantages that: the hollow cathode lamp and the atomic absorption spectrometer can generate sharp lines with two-dimensional quantity, and break through the obstruction that the hollow cathode lamp is needed to be replaced once when one element is measured in the technical field of atomic absorption at home and abroad, and a plurality of elements are measured by primary sample introduction simultaneously.

The invention belongs to the field of water environment monitoring methods, in particular to a method for measuring arsenic and mercury in water by hydride generation-atomic fluorescence spectrometry. The method comprises the following steps of: a) preparing a mixed sample solution which contains the arsenic and the mercury; b) generating arsine vapor and mercury vapor by using the mixed sample solution and a potassium borohydride solution; and c) introducing the arsine vapor and the mercury vapor into an atomizer by using a carrier gas, exciting the arsine vapor and the mercury vapor by using a special hollow cathode light source to generate atomic fluorescence, detecting the intensity of the atomic fluorescence, and calculating the content of the corresponding components in the sample solution by utilizing the direct proportion relationship of the fluorescence intensity with the content of the arsenic and the mercury in the solution. By using the method, the content of the arsenic and the mercury in environmental water can be measured at the same time; the method is operated simply and quickly; and labor, time and reagents are saved.

The invention belongs to the field of water environment monitoring methods, and particularly relates to a method for stably measuring arsenic and mercury in water by atomic fluorescence spectrometry. The method includes a), respectively preparing sample solution containing mercury and thiourea and sample solution containing arsenic and thiourea; b), mixing the sample solution containing the arsenic with potassium borohydride solution to generate arsine steam, and mixing the sample solution containing the mercury with stannous chloride solution to generate mercury steam; and c), guiding the arsine steam and the mercury steam into an atomizer by carrier gas, generating atomic fluorescence by an excitation effect of a special hollow cathode lamp which is a light source, and detecting the intensity of the atomic fluorescence. The content of the arsenic and the content of the mercury in the environmental water are measured by the atomic fluorescence spectrometry, operation is simple, convenient and speedy, labor, time and reagents are saved, and a measurement result is stable and reliable after the thiourea is additionally used in the method.

The invention discloses an on-line electric chemical separation enrichment tungsten-filament electrothermic atom absorption detection device, comprising an electric deposition separation enrichment unit, a tungsten-filament atomizer, a hollow cathode lamp, a micro CCD spectroscope, a tungsten-filament heating power, an electric deposition power, a flow injection system, a step motor and a computer. The electric deposition unit is vertically set in the cavity of the atomizer and at the right inferior of the tungsten-filament and a inner and outer double-layer groove is set on the top of the electric deposition unit, wherein two platinum electrodes are stuck on the inner layer groove and a sample injection hole is set in the center and two platinum electrode conductor eduction holes are set at the two side; and a liquid drainage hole is set in the outer layer groove. The lower end of a rod is connected with a connection sleeve and a sample filling tube, a discharging tube on the connection sleeve are respectively connected with a liquid feeding tube and a liquid discharging tube of a flow injection system and platinum electrode conductors are connected with an anode of the electric deposition power; and the tungsten-filament is connected with the atomization heating power and also connected with the cathode of the electric deposition power; and the connection sleeve is driven by the step motor to make the vertical operation. The device has strong anti-jamming capability and high automaticity.

The invention relates to a method for detecting chromium content in steel and iron alloy. The method comprises the steps of (1) digesting a sample by using an acid solution to prepare a solution to be detected; (2) dissolving chromium by using the acid solution to prepare a standard solution with definite chromium content, injecting the standard solution to a flame atomic absorption spectrometer, measuring light absorption values corresponding to standard solutions with different chromium concentrations under the condition that the ray has the wavelength of 357.9nm, and drawing a working curve; (3) placing the solution to be detected into the flame atomic absorption spectrometer, and measuring the light absorption value of the solution to be detected by using a chromium hollow cathode lamp under the condition that the ray has the wavelength of 357.9nm; (4) comparing the light absorption value with the working curve, measuring the chromium content in the solution to be detected, and then, calculating to obtain the chromium content in the sample.

The invention relates to the field of laser device wavelength detection and particularly relates to a compensation method and device for testing wavelength temperature drift based on a Fabry-Perot etalon. The method is characterized in that a part of laser emitted by a tunable laser device is separated out; absolute calibration of the part of laser is carried out, and lambda 0 and T0 of the calibration wavelength are calculated; the wavelength lambda and the shell temperature T of the Fabry-Perot etalon are obtained, and the tested wavelength is corrected according to the lambda 0, T0, lambdaand T to obtain a corrected wavelength lambda corr. The method is advantaged in that a Fabry-Perot temperature drift feedback mechanism is adopted, so the drift of the tested wavelength caused by thetemperature change of the Fabry-Perot etalon is compensated, and wavelength measurement precision and stability are improved; a hollow cathode lamp calibration mode is adopted, so absolute precision of the laser wavelength is ensured, and stability and precision of wavelength measurement are improved. The method is advantaged in that a problem that a temperature detection error of the Fabry-Perotetalon is equivalent to the amplitude of the temperature changing with the time is solved, and precision and stability of the central wavelength of the laser device are improved.

The invention relates to a heavy metal detector with switching function and good detection effect. The heavy metal detector comprises a base, a protective cover, a switching mechanism and a cleaning mechanism, the switching mechanism comprises an isolation plate, a glass plate, a housing, a conveyor belt, a conductive component, a second motor, two rotating rollers, at least two hollow cathode lamps and at least two contacts, the cleaning mechanism comprises a guide rail, a moving seat, absorbent cotton, a driving component and two supporting components, wherein the conductive component comprises a sliding rod, an elastic sheet, two first springs and two moving sleeves, in the heavy metal detector with a switching function and a good detection effect, the switching between the hollow cathode lamps can be achieved through the switching mechanism, so that the heavy metal detector can detect different elements, the working efficiency of the heavy metal detector is improved, the glass plate can be cleaned through the cleaning mechanism, the decay of the energy of the hollow cathode lamps can be weakened, and the detection effect of the heavy metal detector can be improved.

The invention discloses an optical system with a pulse xenon lamp used for atomic absorption background correcting. The pulse xenon lamp and a hollow cathode lamp in the system are controlled by a pulse xenon lamp power supply and a hollow cathode lamp power supply of a control system respectively, and power supplying is carried out by the pulse xenon lamp power supply and the hollow cathode lamp power supply. The pulse xenon lamp and the hollow cathode lamp are matched to form a combined beam which enters an atomizer through a first lens and is output through the atomizer, then the combined beam enters a rotating color filtering lens group through a second lens and is output into a beam splitting system through the rotating color filtering lens group, and the light beam is output through the beam splitting system and then enters the control system through a photomultiplier and a pre-amplifier in sequence. The pulse xenon lamp is used as an atomic absorption background correcting light source, the shortcoming of a deuterium lamp which is used as the atomic absorption background correcting light source in the prior art is effectively overcome, and meanwhile the color filtering lens group which is matched for use greatly improves the accuracy of background correcting.

The invention discloses a method for determining the sulfide content of soil. The method comprises: weighing a proper amount of a soil sample and putting it into a reaction bottle equipped with a sand core, adding an alkaline deoxidizing deionized water mixed solution dissolved with Zn(AC)2.2H20 and NaAC.3H2O and stirring the mixture evenly; subjecting the reaction bottle to heating water bath to make sulfides in soil generate zinc sulfide precipitates and immobilizing the precipitates, blowing air into the reaction bottle and performing bubbling through the sand core, and blowing out volatile organic interferents in the soil; adding dilute sulfuric acid to produce a hydrogen sulfide gas, blowing air into the reaction bottle to load the hydrogen sulfide gas into a spectrometer; letting the spectrometer to perform absorption at a 202.6nm wavelength place of the hydrogen sulfide gas, using a zinc hollow cathode lamp to measure the absorbance at the wavelength place; and comparing the determined absorbance with the absorbance of a sulfide standard solution to obtain the sulfide content of the soil. The method provided by the invention can efficiently and rapidly determine the sulfide content of the soil, is suitable for mass soil analysis, and satisfies the precision requirement for detecting sulfur-containing organic matters in soil.

The invention discloses an absolute wavelength calibration and adjustment device and method. The absolute wavelength calibration and adjustment device and method are used for calibrating and adjusting the absolute wavelength of an excimer laser. The device sequentially comprises a first positive lens (1), a homogenizing sheet (2), a second positive lens (3), a first semi-transparent and semi-reflecting lens (4a), a second semi-transparent and semi-reflecting lens (4b), a first hollow cathode lamp (5a), a second hollow cathode lamp (5b), a third positive lens (6a), a fourth positive lens (6b), a first light filter (7a), a second light filter (7b), a first ultraviolet photoelectric detector (8a), a second ultraviolet photoelectric detector (8b) and a third ultraviolet photoelectric detector (8c) according to the direction of a light path, wherein the first hollow cathode lamp (5a) and the second hollow cathode lamp (5b) are made of different elements. According to the method, calibration and adjustment of the absolute wavelength of the laser are carried out through the two hollow cathode lamps filled with different elements respectively on the basis of a method of at least two high-absorption intensity atomic absorption lines of about 193nm emitted from two different elements; the absolute wavelength calibration and adjustment accuracy is improved through high-contrast signal variations generated at the two strong atomic absorption lines; and the requirements on the detection circuit accuracy can be reduced.

The invention discloses an internal standard method for gas sampling non-dispersive atomic fluorescence detection of transitional and precious metal elements. The internal standard method comprises the steps of: (1) providing an apparatus: irradiating an atomizer by hollow cathode lamps of an internal standard element and a to-be-tested element according to the time order (or alternatively), so as to alternatively stimulate atomic fluorescence signals of the internal standard element and the to-be-tested element and achieve the purpose of detecting the two elements at the same time; (2) preparing solutions: respectively adding a certain amount of internal standard elements to a standard solution and a sample solution; (3) drawing a correction curve: detecting fluorescence value ratio I analysis / I interior label of the analysis element and the internal standard element in the standard solution, and building the correction curve according to the concentration Ci (i=1,2,3,...) of the analysis element by the I analysis / I interior label; and (4) detecting the fluorescence value ratio I sample / I interior label of the analysis element and the interior label element in the sample under the same condition, and determining the content Cx of the to-be-tested element in the sample from the correction curve. By adopting the method, the instability of the apparatus and various interferences in detection can be effectively removed, and the detection precision and accuracy are also improved.

The invention belongs the technical field of test. A deuterium lamp and a halogen tungsten lamp are adopted as standard light sources, and the starting time of a hollow cathode lamp is determined according to the response signal change of a silicon photocell through comparing the signal responses of the characteristic wavelength of the hollow cathode lamp and a background wavelength and determining the radiation intensity and the background noise of the hollow cathode lamp. A hollow cathode lamp test device involved in the invention is formed by a light source system, a monochromator system, detectors and a data processing system, a cone pulley disc (2) in the light source system is symmetrically provided with a deuterium lamp standard light source (3) and a halogen tungsten lamp standard light source (4), the coaxial space circumference is provided with n hollow cathode light sources, and is between 2 and 8; and silicon photocell detectors (9) are fixed at the opposite sides of the cone pulley disc and on the standard light source and hollow cathode lamp distributed space circumference. The device traces the magnitude of the standard hollow cathode lamp in an atomic absorption spectrophotometer to the standard light sources, has the advantages of stable magnitude and fastness and convenience in use, and is suitable for testing the starting time, the radiation intensity and the stability of the hollow cathode lamp, the background noise and other technologic parameters.

The invention provides a fixed type combined light source of a spectrograph, aiming at solving the problem that the service life of a hollow cathode lamp of the traditional instrument light source is shortened. The fixed type combined light source of the spectrograph is characterized in that the hollow cathode lamp and a tungsten lamp are fixed on a lamp bracket, and then a plane mirror is arranged opposite to the hollow cathode lamp and the tungsten lamp; a plane mirror which is driven by a motor to rotate is arranged in the center of a mirror bracket so that light rays emitted by the hollow cathode lamp or the tungsten lamp are sent to a concave mirror and then reflected to a beam splitting mirror from the concave mirror; the light source is internally provided with a deuterium lamp, emitted light rays are reflected to the concave mirror through the plane mirror and then reflected to the beam splitting mirror from the concave mirror, and then the beam-combined light rays are emitted through a color filter positioned on a color filter bracket or a hole without the color filter. The invention has the advantages of prolonging the service life of the hollow cathode lamp and the tungsten lamp because the hollow cathode lamp and the tungsten lamp are fixed on the lamp bracket and enlarging the application range of an instrument by installing the tungsten lamp.

The invention discloses an inductively coupled plasma atomic mass spectrometry and spectrum simultaneous detection system and method. The detection system comprises an inductively coupled plasma source, a mass spectrometry detection system and a spectrum detection system. The spectrum detection system is composed of a hollow cathode lamp, a spectrum detector and a spectrum detection control module; atomic mass spectrum signals are collected in the axial direction of inductively coupled plasma, and atomic emission and absorption spectrum signals are collected in the radial direction. Accordingto the invention, one inductively coupled plasma source is shared; atomic mass spectrum detection, atomic emission spectrum detection and atomic absorption spectrum detection are integrated in the same ion source / excitation source / atomizer, one-time sample injection can be achieved, atomic mass spectrum detection, atomic emission spectrum detection and atomic absorption spectrum detection can be achieved at the same time, and therefore the consumption of samples and reagents is reduced, the analysis time is saved, and the instrument cost and the use and maintenance cost are reduced.

The invention discloses a single photoelectric tube five-channel atomic absorption spectrometer, which includes a main light plate, the main light plate comprises a hollow cathode lamp, a first concave mirror reflector, a flame center, an into-seam concave mirror reflector, an into-seam seat, an into-seam light shading plate, a flat field concave grating, a MgFe door bracket and a photomultiplier tube; a Mg and Fe sharp line control spectrum light door is installed on the MgFe door bracket, and a Ca, Cu and Zn three element sharp line control spectrum light door is installed on a concave grating Rowland circle determined by the flat field concave grating. By use of one photomultiplier tube to replace five photomultiplier tubes and a matched negative high voltage circuit and a detection circuit in the prior art, the single photoelectric tube five-channel atomic absorption spectrometer is simple to make, low in cost, small in size and simple in structure. A horizontal spectrum light door is used for Ca, Cu and Zn, a vertical spectrum light door is used for Mg and Fe, and the space is saved by layering installation of the light doors.

The invention is a power supply device used for a hollow cathode detection system. In the power supply device, a 220V alternating current power (1) is output to a booster (4) to be boosted to an alternating current power of 600V-700V via a filter (2) and a voltage stabilizer (3), then the alternating current power of 600V-700V is converted into direct current voltage via a bridge type rectifier I (5), then the direct current voltage is divided into two paths, one path of the direct current voltage is directly output to a hollow cathode lamp (6), the other path of the direct current voltage generates pulse current via a silicon controlled rectifier (7) and then the pulse current is output to the hollow cathode lamp (6), and in addition, the working current of the hollow cathode lamp (6) is output to control signal input ends of the silicon controlled rectifier (7), four pin and six pin, via a bridge type rectifier II (8). Compared with the prior art, the power supply device adopts a direct current-and-pulse current combined power supply system. The pulse current is generated in wave absorption by a single silicon controlled rectifier parallelly connected in a combined circuit. The power supply device is advantaged in that power supply capacity is large, excitation intensity is strong, and a low detecting limit of detected elements of below ppm grade is achieved.

Disclosed are an atomic absorption spectrometer for detecting lead and cadmium elements in grain at the same time and a detection method. The spectrometer adopts a lead-cadmium composite hollow cathode lamp, a power supply and a control module, wherein the hollow cathode lamp is arranged in a lead element high-performance lamp working state, a cadmium element common lamp working state, and a copper element adjacent wavelength background correction working state, so that background correction measurement of lead and cadmium elements at the same time is achieved. At the meanwhile, a diatomized region atomizer, a power supply and a control module are adopted, wherein the diatomized region atomizer is arranged in a regional time-sharing atomization mode, and through setting of whether samplingis carried out in different regions and adjustment of sampling amounts in different regions, lead and cadmium single elements are calculated and selected in excellent sensitivity. The detection method comprises a pre-treatment method of extracting lead and cadmium elements from grain at the same time and a sampling and data treatment method for measurement at the same. The lead-cadmium compositehollow cathode lamp is different from a common multielement lamp, and is improved in light energy improved, widened in linearity range, and improved in sensitivity and detection limit. The method is suitable for detecting lead and cadmium elements in grain at a fast large flux at the same time.

The invention provides a cathode material of a hollow-cathode lamp and a preparation method thereof, belonging to the technical field of analyzing and testing devices. The cathode material is prepared from the component of AgSe alloy, wherein the percentage composition of Se in the AgSe alloy is 10-80%, and the percentage composition of Ag is 20-90%. The preparation method comprises the following steps: weighting Ag and Se based on the proportion and mixing; putting the mixed materials into a smelting device, and vacuumizing to the vacuum degree less than 10-3Pa; and heating the mixed materials, heating up to 600-1400 DEG C until the materials are melt, stirring, and cooling in the furnace to obtain the AgSe alloy, wherein the smelting time is 10-240 minutes. The energy of the hollow-cathode selenium lamp is increased by more than 60%, the drift of the stability is less than 1% (within half an hour), and the mutual interference of Se-Sn / Se-Pb alloy elements in atomic fluorescence analysis is overcome.

The invention relates to a gas analyzer. The gas analyzer comprises an alloy substrate, a main controller, a hollow cathode lamp, a laser module, a light shielding device, a gas chamber, a detection and analysis module, a gas inlet module, a compensation module, a data acquisition module, a time control module, a power supply module, a gas impurity detection device, a gas leakage detection device, an alarming device, an automatic stopping module and a protection shell. The gas analyzer has good high-temperature-resisting and corrosion-resisting performances so that the instrument can be reliably used for a long period; furthermore, a wrong result caused by the fact that impurities are doped into a gas sample also can be completely avoided, further loss of production and researches is avoided, and gas leakage can be found in time; the gas analyzer has a simple structure and commonality, sensitive response on a lot of substances, a wide measurement range, rapid response and a stable response signal.

The invention discloses an on-line electric chemical separation enrichment tungsten-filament electrothermic atom absorption detection device, comprising an electric deposition separation enrichment unit, a tungsten-filament atomizer, a hollow cathode lamp, a micro CCD spectroscope, a tungsten-filament heating power, an electric deposition power, a flow injection system, a step motor and a computer. The electric deposition unit is vertically set in the cavity of the atomizer and at the right inferior of the tungsten-filament and a inner and outer double-layer groove is set on the top of the electric deposition unit, wherein two platinum electrodes are stuck on the inner layer groove and a sample injection hole is set in the center and two platinum electrode conductor eduction holes are setat the two side; and a liquid drainage hole is set in the outer layer groove. The lower end of a rod is connected with a connection sleeve and a sample filling tube, a discharging tube on the connection sleeve are respectively connected with a liquid feeding tube and a liquid discharging tube of a flow injection system and platinum electrode conductors are connected with an anode of the electric deposition power; and the tungsten-filament is connected with the atomization heating power and also connected with the cathode of the electric deposition power; and the connection sleeve is driven bythe step motor to make the vertical operation. The device has strong anti-jamming capability and high automaticity.

The invention provides a multielement composite hollow cathode lamp which comprises a lamp base, a lamp shell, a hollow cathode and a hollow anode, wherein the cathode and the anode are installed in the lamp shell. The cathode and the anode are installed on the same center line, the cathode comprises a cathode bushing, a first cathode layer, a second cathode layer and a third cathode layer, the first cathode layer, the second cathode layer and the third cathode layer are made of different materials, the cathode bushing is provided with a cavity with an open end, the open end faces towards the anode, the three cathode layers are embedded in the cavity of the cathode bushing, a hole is formed in the center of the hollow cathode, and the hole penetrates through the third cathode layer and the second cathode layer and stretches to a position which is 1 / 4-1 / 2 of the first cathode layer. The multielement composite hollow cathode lamp can achieve the fact that different elements can be measured at the same time without rotation in a measurement process, and operation is very convenient. According to the multielement composite hollow cathode lamp, the three cathode layers are integrated in the cathode bushing, so the structure is simple; concentricity of the cathode and the anode is easily guaranteed, and improvement of measurement precision is facilitated.