The metal material element analyzer is a commonly used analytical instrument. The intelligent high-speed scientific instrument can better meet the multi-element analysis of materials in the metallurgy, machinery, chemical and other industries in the front, the finished product, the incoming material test and so on.
Technical principle of metal material element analyzer
This project is an upgraded product of photoelectric colorimeter. The detection principle of the colorimetric analysis instrument is a solution containing different elemental components, the compounds of which are of different colors and have selective absorption spectra for different wavelengths of light. Therefore, when a fixed-wavelength light passes through a solution containing a certain element (colored solution), light absorption occurs, which is obtained by Lambert-Beer's law:
When monochromatic light passes through a colored solution, the light intensity transmitted through the solution is not only related to the concentration and thickness of the solution, but also to the absorption properties of the solution itself:
A = KCL
Where A is the extinction value, which is the logarithm of the ratio of the transmitted light intensity I to the emitted light intensity I0 (the reflected light intensity is negligible), ie A = lg (I0 / I);
K is the extinction (absorption) coefficient of an element solution, and an element solution has a certain value for the K value of incident light of a certain wavelength (monochromatic light). If the concentration of the solution is expressed in mol/l and the thickness of the solution is expressed in cm, the K value at this time is called the molar extinction coefficient;
C is the concentration of the solution and is related to the content of the element in the solution;
L is the optical path, the thickness of the solution, which is related to the cuvette in this product.
The colorimetric analysis of colorimetric analysis instruments is based on Lambert-Beer's law.
If a standard solution of known concentration is prepared first, and the standard solution and the solution to be tested are treated in the same manner, and then the color is measured, and the absorbance is measured by a colorimetric analyzer under the same experimental conditions, then As = in the standard solution. KsCsLs, in the solution to be tested, Ax=KxCxLx. If the same thickness of the cuvette is used to make L equal, and the monochromatic light of the same wavelength and the same ambient temperature are used, k is also equal, ie, As/Ax= Cs/Cx or Cx=(Ax/As)Cs can measure the concentration of the measured solution as long as it can measure the absorbance value. This is the basic principle of colorimetric analysis.
Due to different elements and different detection and analysis methods, different specific wavelengths are required (such as the determination of molybdenum in steel by thiocyanate spectrophotometry with 520 nm; the determination of low silicon in steel by ferrous sulphate sulphate and molybdenum blue method) With 700nm), the wavelength of the light source of the traditional elemental analyzer is fixed and not adjustable, and it can not meet the needs of various industries such as metallurgy, foundry, machinery, chemical industry and the like to detect various elements with new materials. This project is the first in China to adopt the wavelength-adjustable optical system to achieve continuous measurement wavelength measurement and analysis components using curved-type cuvettes and other innovative techniques, and regression curve calculation using multi-byte floating-point logarithmic operation, parameter adjustment and tracking The electronic automatic adjustment design can realize the continuous adjustment of the wavelength of the light source, and the wavelength accuracy is obviously improved (from the past 20nm to the current 2nm or less), thus meeting the needs of users in various industries to detect the content of various elements of different materials. .
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