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Please use this identifier to cite or link to this item: http://hdl.handle.net/10400.5/3560

Title: Grape must mineralization by high pressure microwave digestion for trace element analysis: development of a procedure
Other Titles: Desenvolvimento de um procedimento de mineralização de mosto para análise elementar por digestão por microondas
Authors: Catarino, S.
Trancoso, I.M.
Sousa, Raul Bruno de
Curvelo-Garcia, A.S.
Keywords: grape must
wine
mineralization
high pressure microwave digestion
HPMW
trace element analysis
Issue Date: 2010
Publisher: Estação Vitivinicola Nacional
Citation: "Ciência e Técnica Vitivinicola". ISSN 0254-0223. 25:2 (2010) 87-93
Abstract: The present work describes the development and validation of a high pressure microwave-assisted mineralization procedure for the determination of metals in grape must by spectrometric techniques. Metals of special oenological and food safety importance (Al, Co, Cu, Cd, Pb) were used as model elements to achieve the optimum working conditions. The study was conducted by monitoring their concentration in experimental samples by ETAAS. Different combinations of HNO3 and H2O2 were tested and an optimal volume of 1 mL of each reagent, added to 2 mL of sample, was selected for further studies. In comparison with experimental conditions described in literature for the mineralization of grape must and wine by HPMW, the proposed procedure requires very low reagent consumption. Time and temperature were regarded as factors in the optimization study of microwave oven program, resulting in 72 minutes of extension including ventilation. The procedure trueness and precision were evaluated using grape must and wine samples. For each element three different levels of addition were performed. The recovery range was from 94% (Co) to 113% (Pb) in grape must and from 96% (Cu) to 128% (Al) in wine. Relative standard deviations ranged from 1% (Cd) to 11% (Al) in grape must and from 2% (Cd, Pb) to 9% (Co) in wine (n = 10). The proposed procedure is suitable for grape must and wine mineralization with a view to trace element analysis.
Description: Analytical Note
Peer Reviewed: yes
URI: http://hdl.handle.net/10400.5/3560
ISSN: 0254-0223
Appears in Collections:DQAA - Artigos de Revistas

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