Graphite furnace atomic absorption spectrometry (GFAAS) is a cup-shaped atomizer made of graphite material, which is atomized by current heating for atomic absorption analysis.
Extended data
In 1980s, the appearance of transverse heating graphite furnace explained theoretically that there was no temperature gradient phenomenon in the longitudinal heating graphite tube. The appearance of graphite furnace atomization technology greatly improves the atomization efficiency, and its analytical sensitivity is 3 ~ 4 orders of magnitude higher than that of flame atomization technology, and the sensitivity can reach10-12 ~10-14g, which is undoubtedly a milestone in the development of atomic absorption spectroscopy.
Graphite furnace atomic absorption spectrometry also has the advantages of less sample (1 determination usually only needs 5 ~ 100μ l), freely adjustable atomization temperature and high safety factor in test operation.
The disadvantages of graphite furnace are narrow analysis range, slow determination speed, high detection cost, poor determination accuracy and poor reproducibility (the coefficient of variation is generally 4% ~ 12%). Sometimes, due to the complexity of some sample matrices, serious background absorption interference will occur, which will greatly affect the determination results.