A heated graphite furnace atomization system is described for use in atomic absorption spectrometry. The furnace is operated continuously, and desolvated sample aerosol is introduced continuously. Graphite components are coated with a layer of pyrolytic graphite for reduced porosity and increased durability. Gradual deterioration due to oxidation is completely compensated for by a continuous pyrolysis treatment. With continuous sample introduction and furnace operation, several benefits are realized. Reproducibility of measurement is improved several-fold. A relatively simple furnace power supply can be used. Transient signals need not be dealt with. Steady-state conditions for the vaporization and atomization processes prevail, and these can be investigated under controlled conditions and temperatures. Thus, matrix effects can be studied in detail and the results of these studies used to advantage.
ASJC Scopus subject areas
- Analytical Chemistry