atom absorption

Development History

Spectroscopy Discovery: In 1802, Wubrenston studied the continuous spectrum of the sun, and the dark line that appeared in the continuous spectrum in the sun continuous spectrum was discovered. In 1859, Kirchhhoff was studied with the flame spectrum of alkali metal and alkaline earth metal and the bulk spectrum of the alkali metal and alkaline earth metal. The absorption has laid the research foundation for spectroscopy.

The production of spectrum instruments: Atomic absorption spectrum is started from 1955 as a practical analysis method. This year, A. Walsh, A.Walsh, published his famous papers 'atomic absorption spectroscopy in chemical analysis' the basis of atomic absorption spectroscopy. In the late 1950s, Hilger, Varian Techtron and Perkin-Elmer have launched atomic absorption spectrum commodity instruments to develop Walzi's design ideas. By the mid-1960s, the atomic absorption spectrum began to enter the rapid development. In 1959 in 1959, Soviet Raviv has published the first papers of electrothermal atomic technology. The absolute sensitivity of the electrothermal atom absorption spectrometry can reach 10-10g, which has developed a step forward. The development of atomic absorption analysis instruments With the development of atomic absorption technology, the continuous update and development of atomic absorption instruments, while other scientific and technological advances provide technical and material foundation for the continuous update and development of atomic absorption instruments. In recent years, a continuous light source and a medium-sized grating have been used, combined with the use of the optical optical video tube, the diode array multi-element analysis detector, and the microcomputer controlled atomic absorption spectrophotometer is designed, and new prospects are opened to solve the multi-element simultaneously. The atomic absorption spectrum system controlled by the microcomputer simplifies the structure of the instrument, improves the degree of automation of the instrument, and improves the accuracy of the measurement, and has a significant change in the appearance of the atomic absorption spectroscopy. In 1959, Soviet Rwoof issued the first paper of electrothermal atomic technology, which has begun research on stable temperature platform graphite stove technology (STPF). So far, with the application of matrix improvement technology, platform and probe techniques, various deduction backgrounds, atomic absorption spectroscopy is constantly being improved.

Features

Spectroscopy is established by a strong absorption of the atomic resonance radiation of the element. When radiating passes through free atomic vapor, and the frequency of incident radiation is equal to the energy frequency required by electrons in the atom to a higher energy state (in general, it is a first excitation state), the atom is from the radiation field Energy, generating resonance absorption, electrons are transitioned from acoustic to excited states, accompanied by the production of atomic absorption spectroscopy. The method has the advantages of low detection limit, high accuracy, good selectivity, fast analysis speed, good stability.

Measurement method

Atomic absorption spectrometry Comply with Langbo Bill, when absorbing the optical path, injectable mode, the sample generated element phase generated phase base atomic pair The monochrome light radiated by the hollow cathode lamp of this element of the sharp line is produced, and the absorbance (a) is proportional to the concentration (C) of the element in the sample. That is, a = kc, k is a constant. According to this, the standard curve can be treated in the unknown solution by measuring the standard solution and the absorbance of the unknown solution, and a standard solution concentration can be known.