E. Masera et al., SILVER MATRIX EFFECTS ON GOLD ATOMIZATION IN A GRAPHITE-FURNACE INVESTIGATED BY 2-DIMENSIONAL LASER IMAGING WITH A GATED CHARGE-COUPLED-DEVICE CAMERA, Journal of analytical atomic spectrometry, 10(2), 1995, pp. 137-144
A pulsed intensified charge coupled device (CCD) camera was used to ma
ke a diagnostic of perturbations, generated by increasing silver quant
ities, on the fluorescence signal of small amounts of gold. Using both
absorption and laser-induced fluorescence (LIF) spectroscopy, picture
s of the furnace, probed with a pulsed laser tuned on a gold transitio
n, were recorded during the atomization step. Spectra of the atomic an
d molecular fluorescence generated by the laser were recorded using cl
assical electrothermal atomization LIF. These data enabled the mapping
of the atomic and molecular species distribution in the furnace, and
the identification of the chemical nature of these molecules. No prono
unced changes were observed in the gold atoms distribution when about
100-200 mu g of silver were atomized, relative to atomization of gold
in a pure water matris. For the silver matrix (approximate to 1 mg), i
mportant silver condensations were formed and the distribution of gold
atoms were strongly modified.