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Determination of Lead in Croatian Wines by Graphite Furnace Atomic Absorption Spectrometry

Blanka Tariba orcid id ; Institute for Medical Research and Occupational Health, Zagreb, Croatia
Alica Pizent ;
Zorana Kljaković-Gašpić ;

Puni tekst: engleski pdf 97 Kb

str. 25-30

preuzimanja: 760



A method has been developed for direct determination of lead in wine by graphite furnace atomic absorption spectrometry (GFAAS) with Zeeman-effect background correction. The thermal behaviour of Pb during pyrolysis and atomisation stages was investigated without matrix modifi er and in the presence of Pd(NO3)2, Pd(NO3)2 + Mg(NO3)2 x 6H2O, and NH4H2PO4 + Mg(NO3)2 x 6H2O as matrix modifiers. A simple 1:1 dilution of wine samples with Pd(NO3)2 as a matrix modifier proved optimal for accurate determination of Pb in wine. Mean recoveries were 106 % for red and 114 % for white wine, and the detection limit was 3 μg L-1. Within-run precision of measurements for red and white wine was 2.1 % and 1.8 %, respectively.
The proposed method was applied for analysis of 23 Croatian wines. Median Pb concentrations were 33 μg L-1, range (16 to 49) μg L-1 in commercially available wines and 46 μg L-1, range (14 to 559) μg L-1
in home-made wines. There were no statistically significant differences (P<0.05) in Pb concentration between commercial and home-made wines or between red and white wines.

Ključne riječi

analytical validation, commercial wines, GFAAS, home-made wines

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Podaci na drugim jezicima: hrvatski

Posjeta: 1.575 *