Snf. Bruno et al., DETERMINATION OF LEAD AND ARSENIC IN WINES BY ELECTROTHERMAL ATOMIC-ABSORPTION SPECTROMETRY, Journal of analytical atomic spectrometry, 9(3), 1994, pp. 341-344
Methods for the determination of As and Pb in wines by electrothermal
atomic absorption spectrometry (ETAAS) are proposed. For As, 8 ml of w
ine were diluted with 1 ml of nitric acid in a PTFE bomb, followed by
heating to 150-degrees-C for 90 min. The transparent solution obtained
was diluted to 10 ml with de-ionized water. The integrated absorbance
s of the solutions were measured by ETAAS using 5 mug of Pd, as a chem
ical modifier. For Pb, the integrated absorbances were measured after
diluting the wine sample, 1 + 4, with 0.2% nitric acid, using a mixtur
e of 10 mug of Pd and 15 mug of Mg as modifier. The detection limits (
k = 3) were 6.6 and 15.5 ng ml-1 for As and Pb, respectively, 20-30 ti
mes below the maximum limits proposed by the control agencies. Three w
ine samples were analysed and the concentrations found were below the
maximum permissible concentrations. Recoveries were approximately 100%
, for analytical solutions containing 10% v/v and 0.2% v/v of nitric a
cid, for As and Pb, respectively. No interference was observed.