What is graphite furnace atomic absorption spectroscopy?
Graphite furnace atomic absorption spectrometry (GFAAS) is also known as electrothermal atomic absorption spectrometry (ETAAS). GFAAS is an established technology for quantifying elements at trace and ultra-trace levels (down to low μg/L) while using only small sample volumes (usually less than 100 μL).
How does atomic absorption spectrophotometer work?
Atomic absorption spectrometry (AAS) detects elements in either liquid or solid samples through the application of characteristic wavelengths of electromagnetic radiation from a light source. Individual elements will absorb wavelengths differently, and these absorbances are measured against standards.
How is AAS used in analyzing minerals?
Atomic Absorption Spectroscopy (AAS) is a very useful tool for determining the concentration of specific mineral in a sample. Liquefied sample is aspirated, aerolized and mixed with combustible gases such as acetylene and air or acetylene and nitrous oxide and burned in a flame to release the individual atoms.
What is the application of atomic absorption spectrophotometer?
Atomic absorption spectroscopy is utilized across many industries and is instrumental in the detection of metals within a sample. As such, this process is commonly utilized in pharmacology, archaeology, manufacturing, mining, and forensics.
What does a graphite furnace do?
Graphite furnaces are used for atomic absorbance measurements. Radiation from the source shines through the tube to the detector. A small volume of sample (typically 0.5 to 10μl) is introduced through the hole into the tube either through the use of a micropipette or a spray system.
Why is atomic absorption spectroscopy important?
Atomic absorption spectroscopy has become one of the most frequently used tools in analytical chemistry. This is because for the determination of most metals and metalloids the technique offers sufficient sensitivity for many applications and is relatively interference free.
Why is AAS useful for metal analysis?
What are advantages of AAS?
The main advantages of AAS are that it is relatively inexpensive and easy to use, while still offering high throughput, quantitative analysis of the metal content of solids or liquids. This makes it suitable for use in a wide range of applications.
How is AAS used in industry?
Industry. Many raw materials are examined and AAS is widely used to check that the major elements are present and that toxic impurities are lower than specified – eg in concrete, where calcium is a major constituent, the lead level should be low because it is toxic.