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Focused Ultrasound Versus Microwave Digestion for the Determination of Lead in Must by Electrothermal-Atomic Absorption Spectrometry

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The content of metals at the different stages of the winemaking process is of great concern because of legal and wine quality reasons. In the present work, we have developed a new fast procedure for metal extraction from must based on focused ultrasound with HNO3 and H2O2, with which microwave digestion of the must is not necessary. Lead was used as a model element to achieve the optimum combination of reagents in order to achieve total extraction. Results were compared with those obtained after microwave digestion of the samples. In addition, conventional and fast programs in conjunction with different matrix modifiers were studied. The method requires few sample mass (ca 0.5 g) and few reagents in low volume (HNO3 50 μL and H2O2 100 μL). The total sample treatment time is only 60 s.
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Document Type: Research Article

Affiliations: 1: Centro de Química Estrutural, Instituto Superior Técnico (IST) de Lisboa, Avda Rovisco Pais, s/n, 1049-001, Lisbon, Portugal. 2: Instituto Nacional de Investigação Agrária e das Pescas (INIAP), Estação Vitivinícola Nacional, 2565–191, Dois Portos, Portugal. 3: Laboratório de Análises do Instituto Superior Técnico (LAIST) de Lisboa, Avda Rovisco Pais, s/n, 1049-001, Lisbon, Portugal.

Publication date: 01 March 2005

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  • The Journal of AOAC INTERNATIONAL publishes refereed papers and reviews in the fields of chemical, biological and toxicological analytical chemistry for the purpose of showcasing the most precise, accurate and sensitive methods for analysis of foods, food additives, supplements and contaminants, cosmetics, drugs, toxins, hazardous substances, pesticides, feeds, fertilizers and the environment available at that point in time. The scope of the Journal includes unpublished original research describing new analytical methods, techniques and applications; improved approaches to sampling, both in the field and the laboratory; better methods of preparing samples for analysis; collaborative studies substantiating the performance of a given method; statistical techniques for evaluating data. The Journal will also publish other articles of general interest to its audience, e.g., technical communications; cautionary notes; comments on techniques, apparatus, and reagents.
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