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What are the difference flameless technique used in Atomic absorption spectroscopy
Accepted Answer
Flameless techniques used in Atomic Absorption Spectroscopy (AAS) include:
1. Electrothermal Atomization-Graphite furnace AAS:
A graphite furnace is used to atomize the sample by rapidly heating it to a high temperature in the absence of a flame. The furnace is typically made of pyrolytic graphite and can reach temperatures of up to 3000 °C. This technique is highly sensitive and can be used to determine the concentration of metals in a variety of matrices.
2. Cold Vapor AAS:
Cold vapor AAS is used to determine the concentration of mercury in a sample. The sample is first treated with a reducing agent to convert the mercury to elemental mercury. The elemental mercury is then purged from the sample using an inert gas and passed through a cold vapor generator. The cold vapor generator converts the elemental mercury to atomic mercury, which can then be detected by AAS.
3. Hydride Generation AAS:
Hydride generation AAS is used to determine the concentration of arsenic, selenium, and antimony in a sample. The sample is first treated with a reducing agent to convert the arsenic, selenium, or antimony to their corresponding hydrides. The hydrides are then purged from the sample using an inert gas and passed through a quartz tube furnace. The quartz tube furnace converts the hydrides to their corresponding atomic species, which can then be detected by AAS.
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