Graphite Furnace Atomic Absorption Spectrometry

摘要: Graphite furnace atomic absorption spectrometry (GFAAS) is also known as electrothermal atomization (ETAAS). It an spectroscopic technique in which a small sample placed inside graphite tube that then resistively heated to accomplish desolvation (for liquid samples), ashing or charring (to decompose the and volatilize some of matrix), finally atomization. Typically, light from line source characteristic element being determined passed longitudinally through absorbance resulting presence free analyte atoms gas phase measured. A continuum high-resolution spectrometer can similar objective. The signal transient character, lasting approximately 1–5 s, area under this peak generally used construction calibration curve. Modern instrumentation provides high levels automation with capabilities background correction well routine methods analysis, for example quality assurance/quality control (QA/QC), standard additions, matrix modification, etc. Since was first introduced 1969, lot progress has been made understanding processes occurring within atomizer ultimately produces signal. An formation process facilitated application analysis variety complex samples. Graphite (also ETA) considered ultratrace microtrace analytical limits detection (LODs) low picogram range, precision few percent (relative deviation), dynamic range about three orders magnitude. In addition its excellent sensitivity, it unique ability handle microsamples including aqueous solutions, viscous liquids, slurries, even solids. general, there considerable literature detailing procedures determination analytes matrices be by analyst apply approach new, needs. When correctly, tool provide precise, accurate wide types. Keywords: graphite furnace; electrothermal atomizer; flameless atomizer; GFAAS; ETAAS; ultratrace metal