1. Condensation of analyte vapor species in graphite furnace atomic absorption spectrometry
- Author
-
V. Pavski, N.A. Panichev, Chuni L. Chakrabarti, Ralph E. Sturgeon, and Q. Ma
- Subjects
Analyte ,Chemistry ,Analytical chemistry ,Oxide ,Mass spectrometry ,Atomic and Molecular Physics, and Optics ,Analytical Chemistry ,Aerosol ,law.invention ,chemistry.chemical_compound ,Wavelength ,law ,Graphite ,Graphite furnace atomic absorption ,Atomic absorption spectroscopy ,Instrumentation ,Spectroscopy - Abstract
A shadow spectral digital imaging technique (SSDI) with charge coupled device (CCD) camera detection was used to investigate the spatial and temporal distribution of condensation clouds of analyte species generated in a graphite furnace during the atomization of 5–40-μg masses of metals. Complex, non-uniform structures of aerosol species located away from both the graphite tube axis and walls are prevalent. Species giving rise to observed signals are likely clusters of metals in the case of Ag, Au and Pd, and oxide aerosols for elements such as Al, Ca and Mg. Source scatter often arises during the atomization of relatively large masses of analytes (or during the atomization of real samples containing high concentrations of concomitant matrix species) in the graphite furnace due to such aerosol formation. The SSDI technique is an extremely useful aid to the elucidation of this phenomenon and imaging at several wavelengths using both line and continuum sources in combination with (thermal, incandescent) emission from these structures permits a more complete picture to be developed.
- Published
- 1999