原子吸收 英语 aas and aes 范文模板

原子吸收英语 aas and aes 范文模板Atomic Absorption Spectroscopy (AAS) and Atomic Emission Spectroscopy (AES) are two powerful analytical techniques used to determine the concentration of a particular element in a sample. Both AAS and AES rely on the interaction between atoms and electromagnetic radiation to provide information about the amount of an element present in a sample.
AAS is commonly used to measure metal concentrations in solutions. In this technique, light from a hollow cathode lamp (HCL) with a specific wavelength that matches that of the metal being analyzed is passed through the solution. The metal atoms in the solution absorb some of this energy, causing them to enter an excited state. As these excited atoms return to their ground state, they release energy which can be measured by a detector. The amount of energy released is proportional to the concentration of the metal in the sample.
AES, on the other hand, involves exposing a sample to high-
energy plasma or flame to excite its atoms into an excited state. This causes them to emit photons at characteristic wavelengths as they relax back down to their ground state. These photons are then measured by a detector and their intensity is proportional to the concentration of each element present in the sample.
One advantage of AAS over AES is that it can detect much lower concentrations due to its ability to selectively absorb certain wavelengths of light. However, AES provides greater specificity for each element being measured, making it useful for complex samples containing multiple elements.
Overall, both AAS and AES have revolutionized modern analytical chemistry and have become essential tools for researchers across many fields. Their ability to rapidly analyze small samples with exceptional accuracy has made them invaluable for applications ranging from environmental monitoring to healthcare diagnostics.。