What Is Atomic Absorption Spectroscopy?

Atomic absorption spectrum, also known as atomic absorption spectrophotometry. Atomic absorption spectrometry analysis is based on the ground-state atoms of the measured element in the vapor phase of the sample to generate resonance absorption of the characteristic narrow-band radiation of the atom from the light source. An instrumental analysis method to determine the content of the element in a sample in proportion to the concentration.

1.The first stage

Every element

Low detection limit and high sensitivity

flame

Atomic absorption spectroscopy is an extremely important analytical method in the field of analytical chemistry and has been widely used in the metallurgical industry. Absorption Atomic Absorption Spectroscopy is a quantitative analysis method that uses the degree of absorption of the ground-state atomic characteristic radiation of the measured element. It can be used for the determination of certain constant components, and also for the determination of ppm and ppb level traces. It can be used for low content of Cr, Ni, Cu, Mn, Mo, Ca, Mg, Als, Cd, Pb, Ad in steel. Raw materials , K2O, Na2O, MgO, Pb, Zn, Cu, Ba, Ca and other elements in ferroalloys and the detection of residual elements in some pure metals (such as Al, Cu).

Some people at home and abroad are committed to studying the application of laser in atomic absorption analysis:

Atomic absorption spectroscopy

(1) Replace the hollow cathode light source with a tunable laser.

(2) Atomize the sample with a laser. It will provide new methods for micro-area and thin film analysis, and new methods for atomization of refractory elements. The application of the Zeeman effect enables the measurement to be performed smoothly in a high background. Continuous light source, mid-step grating monochromator, and wavelength-modulated atomic absorption method (referred to as CEWM-AA method) are a new background correction technology developed in the late 1970s. Its main advantage is that it can work in the entire wavelength range from ultraviolet to visible with only one continuous light source. The high-resolution mid-step grating monochromator with two-dimensional spatial dispersion capability can disperse spectral lines in two-dimensional space, which can not only be subtracted. Scattered light and molecular absorption spectra have background, and can also correct the interference of other atomic absorption lines that directly overlap the dividing line. A television-type optoelectronic device is used as a multi-element analysis and evaluator, and a medium-step grating monochromator and a tunable laser are used to replace the element hollow cathode lamp light source. An electronic computer-controlled atomic absorption spectrophotometer for multi-element determination will be designed to solve Simultaneous determination of multi-element problems opens up new approaches. The introduction of high-efficiency separation technologies such as gas chromatography and liquid chromatography, and the realization of the combination of separation and measurement instruments, will significantly change the appearance of atomic absorption spectrophotometry. Micro-injection technology and solid direct atomic absorption analysis have attracted people's attention. . The significant advantages of solid direct atomic absorption analysis are: the step of dissolving the sample is eliminated, no reagents are added, no separation and enrichment procedures are required, and the possibility of pollution and loss is reduced, which is harmful to biology, medicine, environment, chemistry, etc. This type of area with only a few samples for analysis would be of particular interest. All these new developments deserve our attention. After the microcomputer is applied to the atomic absorption spectrophotometer, the instrument's overall performance and degree of automation have reached a new stage.

Atomic absorption method has been widely used in various fields and has played an active role in the development of industry, agriculture, medicine and health, teaching and scientific research. ^[6]