Abstract

CATARINO, Sofia; CURVELO-GARCIA, A.S.  and  SOUSA, R. Bruno de. Determination of zinc in wine by flame atomic absorption spectrometry (FAAS). Ciência Téc. Vitiv. [online]. 2002, vol.17, n.1, pp.15-26. ISSN 0254-0223.

The determination of zinc in wine is important because this metal is toxic and may involve haze formation during wine storage. This paper describes the determination of total contents of zinc in wine by flame atomic absorption spectrometry. The method was validated and its analytical characteristics were checked (praticability, specificity, algorithm calibration curve, analytical limits, acurracy and precision: repeatability and reproducibility). White, red and fortified wines were used. Within a limited concentration range (0 to 2 mg/dm³), there is some deviation to linearity and a cubic polynomial is a better fit (y = a + bx + cx² + dx³). The quantification limit for zinc was 0,1 mg/dm³ . Spiking wine samples with aqueous zinc gave recoveries between 83,09% and 101,06%. Replicate of 11 wine samples, at several concentration levels, gave relative standard deviations better than 3,0% (n = 10), indicating that the analytical method is of high precision.

Keywords : wine; zinc; flame atomic absorption spectrometry; validation of the method.

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