Atomic Absorption Spectroscopy (AAS), also known as Atomic Absorption Spectroscopy, is an analytical method that quantifies the content of the measured element based on the absorption intensity of the corresponding atomic resonance radiation lines in the ultraviolet and visible light ranges by the outer electrons of the ground state atoms in the gas state. It is a method of measuring the absorption of specific gas atoms by light radiation. This method is mainly applicable for the analysis of trace and trace components in samples. Atomic absorption spectroscopy can measure multiple elements, flame atomic absorption spectroscopy can measure on the order of 10-9g/mL, and graphite furnace atomic absorption spectroscopy can measure on the order of 10-13g/mL. Its hydride generator can perform micro trace determination of eight volatile elements, including mercury, arsenic, lead, selenium, tin, tellurium, antimony, germanium, etc.
Instrument principle
Atomic absorption refers to the absorption phenomenon of characteristic spectral lines radiated by atoms of the same type in a gaseous state. When radiation is projected onto atomic vapor, if the energy corresponding to the radiation wavelength is equal to the energy required for the atom to transition from the ground state to the excited state, it will cause the atom to absorb the radiation and produce an absorption spectrum. The ground state atom absorbs energy, and the outermost electrons undergo a transition from a low-energy state to an excited state. Atomic absorption spectroscopy determines the content of compounds in a sample based on the Lambert Beer law. Given the absorption spectrum and molar absorbance of the required sample elements, and the fact that each element will preferentially absorb light of a specific wavelength, as each element requires a certain amount of energy to transition from the ground state to the excited state. During the detection process, the ground state atoms absorb characteristic radiation, and the content of the tested element is measured by measuring the degree of absorption of characteristic radiation by the ground state atoms.
application area
Due to the sensitivity, accuracy, and simplicity of atomic absorption spectroscopy, it has been widely used for the analysis of constant and trace elements in metallurgy, geology, mining, petroleum, light industry, agriculture, medicine, health, food, and environmental monitoring.