93 results about "Hollow-cathode lamp" patented technology

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 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 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.