Spectral dispersion is usually driven by mechanical devices.

Atomic spectroscopy analysis is mainly divided into the following three categories: atomic emission spectroscopy, atomic absorption spectroscopy and atomic fluorescence spectroscopy.

Atomic emission spectroscopy (AES) can analyze the full spectrum of matter, exciting the outer electrons of atoms from stable ground state to unstable high-energy state by high-energy excitation origin, which belongs to stimulated process; then, electrons from high-energy state will transit freely to ground state, in this process, they will emit spectra of different frequencies. These characteristic spectra are closely related to the element content, and the energy of the spectra is proportional to the element content. The excitation origin plays an important role in atomic emission spectrometry. At present, ICP (Inductively Coupled Plasma Excitation Origin) is a common excitation origin, and the development of ICP power supply is the core of the atomic emission spectrometer system. Atomic emission spectroscopy (AES) is rich in information. Traditional instruments usually use mechanical devices to drive the spectrometer system for spectral dispersion, which puts forward higher requirements for mechanical systems, directly affecting the spectral resolution. At present, the front-edge spectrometer uses CCD technology for full spectrum analysis, eliminating the mechanical device, and improving the spectral resolution.

The quantitative relationship of the AAS analysis method for the accessories of atomic absorption spectrometer can be expressed by Lambert-Beer's law a=abc. In the formula, A is the absorbance, A is the absorbance coefficient, B is the length of the optical path of the absorption pool, and C is the concentration of the sample under test. This method has the characteristics of high sensitivity, high accuracy, good selectivity, less interference, fast speed, easy to realize automation, many elements to be measured, wide range, simple structure, low cost, and so on.

Since its birth in 1955, atomic absorption spectrometry (AAS) has been rapidly applied to various fields of analytical chemistry because of its strong vitality. The large-scale application in China began in the 1990s. The most widely used methods are metallurgy, geological exploration, quality inspection and supervision, environmental detection, disease control and so on. Atomic absorption spectrometry (AAS) is used as the "gold standard" in the Centers for disease control. With the progress of clinical medicine, it has recently been applied to medical and health fields. The application of atomic absorption spectrometry in medicine makes it possible to detect the trace elements in ppm or ppb level correctly. At present, atomic absorption spectrometry (AAS) has been widely used in clinical detection of trace elements. It is the preferred method to completely eliminate biochemical methods (zinc protoporphyrin method, dithizone method, other colorimetric methods) and electrochemical methods.

Atomic absorption spectroscopy (AAS) is an absorption spectrum. When excited light with a certain characteristic frequency passes through a gaseous substance, if the gaseous substance contains an element that matches the characteristic spectrum, the peripheral electrons of the element absorb the energy of the characteristic spectrum and transit to other levels of the atom. At the detection end, we can find that the excited signal of the characteristic frequency becomes weaker and the absorption spectrum is formed. Atomic absorption spectroscopy was first discovered by observing the sun's emission spectra. When the full spectrum of the sun passes through the atmosphere, some spectra are absorbed by the substances in the atmosphere, forming a superficial chromatographic line. The front-end of atomic absorption spectrometer needs characteristic light source. At present, the characteristic light source usually uses hollow cathode element lamp. In order to improve the testing efficiency, multi-element high-efficiency measurement is realized by automatic lamp changing device.

Atomic absorption spectrometer accessories