Analysis of the function of graphite tube:
Atomic absorption spectrometry is established according to the atomic resonance radiation of the element by the ground state atom of the measured element in the gaseous state. The method has the advantages of high accuracy, good selectivity and fast analysis speed.
The graphite absorbs the light in the temperature, when the test conditions are fixed, the sample’s ground state atoms are absorbed by the monochromatic light emitted by the hollow cathode lamp as the element of the sharp line light source, and its absorbance (A) is proportional to the concentration (C) of the element in the sample. In the A=KC formula, K is a constant. By measuring the absorbance of the standard solution and the unknown solution, the standard solution concentration can be used as standard curve to obtain the concentration of the element to be measured in the unknown solution.