Similarities and differences between graphite furnace atomic absorption spectrometer and flame atomic absorption spectrophotometer

Graphite furnace atomic absorption spectrometer and flame atomic absorption spectrometer are both atomic absorption spectrometers, which are composed of light source, atomization system, spectroscopic system and detection system.
The similarities and differences between graphite furnace atomic absorption spectrometer and flame atomic absorption spectrometer are as follows:
The main differences are:
1, the atomizer is different
Flame atomizer: It consists of a sprayer, a premixing chamber and a burner. Features: easy to operate, reproducible.
Graphite furnace atomizer: It is a kind of system that places the sample on the graphite tube wall, graphite platform, carbon rod sample hole or graphite crucible and electrically heated to high temperature to achieve atomization. Among them, tubular graphite furnace is the most commonly used atomizer.
The atomization program is divided into drying, ashing, atomization, and high temperature purification.
High atomization efficiency: 100% sample utilization at adjustable high temperatures.
High sensitivity: its detection limit is 10-6~10-14.
Less sample: suitable for the determination of refractory elements.
2. Selection of operating conditions
Selection of operating conditions for the flame burner (test liquid lift, flame type, burner height).
The choice of the optimum operating conditions for the graphite furnace (optimal atomization temperature of the inert gas).
3, accuracy
Flame atomic absorption spectrometry can be measured on the order of 10-9 g/ml.
The graphite furnace atomic absorption method can measure the order of 10-13 g/ml.
4. In addition to its excellent performance, flame atomic absorption adds an online dilution device and a switchable real single- and dual-optical optical system.
The graphite furnace atomic absorption spectrometer uses a laterally heated graphite tube with a heating rate of up to 3800 K/sec. Up to 30 heating steps can be set to suit various applications.

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