INVESTIGADORES
SAVIO marianela
congresos y reuniones científicas
Título:
Análisis multielemental de vinos por espectrometría de masas con plasma acoplado inductivamente luego de una simple dilución.
Autor/es:
AZCARATE, S.M.; MARIANELA SAVIO; ROBERTO A. OLSINA; JOSÉ M. CAMINA
Lugar:
mendoza
Reunión:
Congreso; 37th world congress of vine and wine; 2014
Resumen:
In this paper, a simple method for elemental wine analysis by mass spectrometry with inductively coupled plasma (ICP-MS) is proposed. Different treatments of samples were evaluated; the best one was a simple dilution procedure. The main instrumental conditions for ICPMS were optimized: radio frequency power (RFP), argon flow (ArFR), oxygen flow rate (O2FR), sample flow (SFR) and temperature of the pre-mixing chamber. The best conditions for the determination of analytes were SFR: 0.8 mL min-1, RFP: ArFR 1000 W and 0.85 L min-1, temperature at -5 ° C; the use of oxygen was not necessary. Two strategies were evaluated in the calibration step in order to evaluate and avoid the effects of the matrix: acquous calibration and simulation matrix, with or without internal standard (IS). The calibration matrix simulation is recommended for the determination of As, Ba, Bi, Cd, Ce, Co, Cu, Dy, Er, Eu, Gd, Ge, Hg, Ho, La, Lu, Mn, Mo, Nd, Ni, Pb, Pr, Sm, Sr, Tb, Tl, Tm, Yb and V. The detection limits were between 0.070 (Sr) and 0.747 (Se) mg L-1 and the precision expressed by relative standard deviations (RSD) is 1.5% (Mn) and 14.7% (Ce). The developed method was applied to multi-element analysis in Torrontés wines, Chardonnay and Sauvignon blanc from Argentina. Enriched samples were analyzed with quantitative recoveries. Because its simplicity, the proposed method has advantages compared with others which involving complicated separations and preparations [1]. Dilution on samples of wine reduces matrix effects [2], and is an attractive alternative for performing routine analysis for the determination of the authenticity and quality control of wines [3, 4].