Atomic absorption spectroscopy is one of the spectroscopic methods that can be used to determine the concentration of elements in a sample with high accuracy. AAS is a spectroscopic method for the quantitative measurement of chemical elements using the absorption of optical radiation (light) by atoms in the gaseous state. In analytical chemistry, this technique is used to determine the concentration of a specific element in a sample. AAS can be used to quantify more than 70 types of different elements. Of course, the detection limit is not suitable for all those 70 elements, for example, although the measurement of uranium is included in the software of the atomic absorption device, the lowest concentration that can be measured is around 500 ppm, which is a large amount; Therefore, this device method can be used to measure about 30 elements with a suitable detection limit (below 1 ppm). The basic principles of the atomic absorption spectrometer include the following:

• All atoms can absorb light.
• The wavelength of light that is absorbed is different for each element and is specific to that element.
• The amount of light absorbed directly depends on the concentration of light-absorbing atoms, or in other words, on the concentration of the desired element in the solution sample