期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 54, 期 11, 页码 3923-3928出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf0608930
关键词
method validation; atomic absorption spectrometry; metal residues; olive fruits; fungicide residues
An electrothermal atomization atomic absorption spectrometry method was validated to quantify residues of copper, aluminum, cadmium, chromium, iron, lead, and nickel in olive fruit. The linearity ranges under the optimized conditions were 0.19-20.0, 1.11-50.0, 0.02-2.0, 0.15-20.0, 0.80-20.0, 0.35-50.0, and 0.60-50.0 mu g/L, respectively. The limits of quantification were, expressed in nanograms per gram of dry weight, 12.6, 74.0, 1.34, 10.0, 53.4, 23.4, and 40.0, respectively. For all of the metals the precision of the instrumental method was < 6.3% and that of the analytical method was always < 10%, except for aluminum, for which the precision was 12%. The accuracy of the method was evaluated according to the standard additions method, the recoveries being > 90% for all of the added concentrations. An interference study was also carried out in a simulated matrix, and it was verified that the deviations of the expected values were < 6% for all of the metals. The method was applied to the monitoring of the residues of the referred metals in olive fruits collected from trees pulverized with three different copper formulations available on the market to control fungal diseases.
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