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Atomic Absorption SpectrometerAtomic absorption spectrometer is an extremely important analysis methods of analytical chemistry, has been widely used in metallurgical industry. Atomic absorption spectrometry is characteristic of measured element of ground state atom absorb radiation degree method for quantitative analysis. For some constant composition determination and PPM, PPB level determination of trace, steel can be low levels of Cr, Ni, Cu, Mn, Mo, Ca, Mg, Al, Cd, Pb, Ad; K2O of raw materials, iron alloy, Na2O, MgO style, Pb, zinc, such as Cu, Ba, Ca element analysis and some pure metal (such as Al, Cu) of residual elements in detection.
History:
The generation of spectral instrument: atomic absorption spectrum, as a kind of practical analysis method was set up in 1955. The Australian of the year Mr Ramesh (aleem walji alsh) published his famous paper "application of atomic absorption spectrometry in the analysis of chemical laid the foundation of atomic absorption spectrometry. The early 50 s and 60 s, Hilger, Varian Techtron and Perkin Elmer - the company has introduced a commodity atomic absorption spectrum instrument, development of the west design idea. In the 60 s, atomic absorption spectrum into a fast developing period. Electrothermal atomic absorption spectrometry instrument production in 1959, the Soviet union lvov has published the first paper of electrothermal atomization technology. The absolute sensitivity of electrothermal atomic absorption spectrometry could reach 10-10 g, the atomic absorption spectrometry is a step forward. The development of the atomic absorption analysis instrument with the development of the atomic absorption technology, promotes the updating and development of the atomic absorption instrument, and the other the progress of science and technology, to constantly update and development of the atomic absorption instrument provides technical and material base. In recent years, the use of continuous light sources and echelle, combine vidicon and diode array detector element analysis, the design of the microcomputer control of atomic absorption spectrophotometer, has opened up a new prospect to solve multielement determination at the same time. Atomic absorption spectrum of microcomputer control system simplified the instrument structure, enhance the automation of the equipment, to improve the measurement accuracy, the appearance of the atomic absorption spectrometry to major changes.
Characteristics:
Spectrometry is according to whether the measured elements in a gaseous ground state atoms of the element's atomic resonance radiation has a strong absorption. High accuracy of the method has low detection limit, good selectivity, fast analysis speed, etc.
Method:
Degree of absorption of optical path, the experimental conditions, such as fixed sample way, the sample of ground state atom element under test phase for sharp line light source of the elements of the hollow cathode lamp radiation absorption of monochromatic light, the absorbance (A) with the sample of the element is directly proportional to the concentration (C). Namely A = KC type, K is constant. On this basis, by measuring the absorbance of the standard solution and the unknown solution, and the known concentration of standard solution, as a standard curve, obtained the unknown element concentrations under test in the liquid.
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