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Atomic absorption spectroscopy (AAS) is a spectroanalytical procedure for the quantitative measurement of chemical elements. AAS is based on the absorption of light by free metallic ions that have been atomized from a sample. An alternative technique is atomic emission spectroscopy (AES).
The atoms absorb ultraviolet or visible light and make transitions to higher electronic energy levels. Applying the Beer-Lambert law directly in AA spectroscopy is difficult due to variations in the atomization efficiency from the sample matrix, and nonuniformity of concentration and path length of analyte atoms (in graphite furnace AA ...
AAS have been shown to alter fasting blood sugar and glucose tolerance tests. [91] AAS such as testosterone also increase the risk of cardiovascular disease [2] or coronary artery disease. [92] [93] Acne is fairly common among AAS users, mostly due to stimulation of the sebaceous glands by increased testosterone levels.
Basic diagram of a hollow-cathode lamp Hollow-cathode lamps from an atomic absorption spectrometer. A hollow-cathode lamp (HCL) is type of cold cathode lamp used in physics and chemistry as a spectral line source (e.g. for atomic absorption spectrometers) and as a frequency tuner for light sources such as lasers.
This is a new type of nebulizer which does not use induction to mix the sample and gas. Instead, pneumatic atomization is employed here, which results in the micro-mixing of fluids using a reflux cell. [5] This means that there is a turbulent mixing of the liquid and gas which results in great sensitivity and is very efficient.
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AAs are recognized by the federal government and are authorized to work at all Veteran Affairs hospitals using the TRICARE insurance program. [19] Licensure defines the practice of AAs and is achieved through state law or by approval of the individual state board of medicine. Physician delegation is achieved through recognition of AAs by the ...
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