SLURRY-ELECTROTHERMAL ATOMIC-ABSORPTION SPECTROMETRIC METHODS FOR THEDETERMINATION OF COPPER, LEAD, ZINC, IRON AND CHROMIUM IN SWEETS AND CHEWING GUM AFTER PARTIAL DRY ASHING
P. Vinas et al., SLURRY-ELECTROTHERMAL ATOMIC-ABSORPTION SPECTROMETRIC METHODS FOR THEDETERMINATION OF COPPER, LEAD, ZINC, IRON AND CHROMIUM IN SWEETS AND CHEWING GUM AFTER PARTIAL DRY ASHING, Analyst, 119(6), 1994, pp. 1119-1123
Slurry-electrothermal atomic absorption spectrometric procedures for t
he rapid determination of the copper, lead, zinc, iron and chromium co
ntents of sweets and chewing gum samples are discussed. The samples we
re first subjected to a process of mild calcination; suspensions were
then prepared in a medium containing 8% ethanol as stabilizing agent,
0.1% ammonium dihydrogenphosphate as chemical modifier and 4% hydrogen
peroxide to prevent the build-up of carbonaceous residues inside the
atomizer. Fast-programme methodology was used for the heating programm
es. Calibration was carried out using aqueous standards, and the relia
bility of the procedures was verified by analysing several standard re
ference materials.