P. Vinas et al., DETERMINATION OF ALUMINUM IN CHEWING GUM SAMPLES USING ELECTROTHERMALATOMIC-ABSORPTION SPECTROMETRY AND SLURRY SAMPLE INTRODUCTION, Fresenius' journal of analytical chemistry, 351(7), 1995, pp. 695-696
A slurry-based electrothermal atomic absorption spectrometric procedur
e for the rapid determination of aluminium in chewing gum samples is d
iscussed. To achieve a sufficiently small particle size, the samples h
ave been first submitted to a mild calcination stage. Suspensions have
been then prepared from the ground carbonaceous residues in a medium
containing 8% v/v ethanol, 1% v/v concentrated nitric acid, 0.2% m/v m
agnesium nitrate and 4% v/v concentrated hydrogen peroxide. Aliquots o
f 10 mu l have been introduced in the furnace and dried at 200 degrees
C for 20 s. No ashing step has been used. Wall atomization has been p
erformed at 2600 degrees C. Calibration has been carried out with aque
ous standards. The reliability of the procedure has been checked by an
alyzing standard reference materials and by comparing the results for
eight commercial samples with those found by a conventional procedure
based on the complete dissolution of the samples. The results for the
commercial samples are in the 36-64 mu g g(-1) range, only one of the
samples giving a higher value of 123 mu g g(-1).