Concentration curves in atomic absorption spectrometry

Quantitative element analysis by isotope dilution in diode laser graphite furnace atomic absorption spectrometry

“…Vaporization-condensation-re-atomization processes during the atomization stage are influenced by the matrix and lead also to spatial distribution interferences. It is suggested that the lateral non-homogeneity of the analyte distribution is the main cause of the curvature of analytical working curves in GFAAS [11]. The spatial distribution of radiant intensities from hollow cathode as well as from electrodeless discharge lamps has been shown to be highly non-uniform [12,13].…”

A Random Number Model for Beer's Law - Atom Shadowing

“…Consider a low-pressure mercury lamp having an output power of 10 ᎑6 W/cm 2 traversing a gas absorption cell (0.38 cm 2 ) at the 253.7-nm resonance line. Given an atomic photon-capture crosssectional area (σ o ) of 1.5 × 10 ᎑14 cm 2 ؒ atom ᎑1 for mercury (7), and an excited lifetime (τ) of 1.1 × 10 ᎑7 s (8), the photon beam flux would be 2. Such a low value indicates a very low probability for a photon to traverse the atomic cross-section of an excited atom.…”

Atomic Absorption, Atomic Emission, and Flame Emission Spectrometry

“…An estimation of the oxygen partial pressure in a typical Massmann-type furnace was given. A theoretical expression for absorbance as a function of the number of analyte atoms in the atomizer volume (136,137) took into account the spatial (cross-sectional and longitudinal) heterogeneity of their distribution. It was shown (137) that nonuniformity of temperature and analyte concentration has a pronounced effect on the relationship.…”