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Difference flameless technique used in Atomic absorption spectroscopy
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Flameless techniques used in atomic absorption spectroscopy are:-
1. Electrothermal atomization (ETA): In ETA, the sample is placed in a graphite furnace and heated to a high temperature to atomize the analyte. This technique is more sensitive than flame AAS, but it can be subject to matrix effects.
2. Hydride generation (HG): In HG, the analyte is converted to a volatile hydride, which is then purged from the solution and passed through an atomic absorption cell. This technique is used for the determination of elements that form volatile hydrides, such as arsenic, selenium, and germanium.
3. Cold vapor (CV): In CV, the analyte is converted to a volatile metal, which is then purged from the solution and passed through an atomic absorption cell. This technique is used for the determination of mercury.
4. Flow injection (FI): In FI, the sample is introduced into a flowing stream of carrier gas, which transports the sample through the atomic absorption cell. This technique is used for the rapid determination of analytes in solution.
5. Laser ablation (LA): In LA, a laser is used to ablate the sample, creating a plume of atoms that is then passed through an atomic absorption cell. This technique can be used for the determination of elements in solid samples.
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