14. Determination of Some Mineral Contents in Thai Fruit Wines by Inductively Coupled Plasma –Atomic Emission Spectrometry

Saksit Chanthai¹*, Rikan Kunno¹, Chalerm Ruangviriyachai¹ and Paiboon Danvirutai²

¹Department of Chemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand, sakcha2@kku.ac.th

²Department of Biotechnology, Faculty of Technology, Khon Kaen University, Khon Kaen 40002, Thailand

(Received 22 November 2005; accepted 09 January 2006)

Abstract: Some mineral contents in fruit wines were analyzed by inductively coupled plasma – atomic emission spectrometry. The fruit wines used in this study were made from local fruits including mango, pineapple, carambola, roselle, red mulberry and “ma-maow”, a wild fruit. An acid digestion of wine sample using a mixture of nitric acid and hydrogen peroxide in the ratio of 10:1 by volume was carried out. It was found that the metal contents were Na: 16.21-60.10, K: 291.2-901.1, Ca: 55.28-114.01, Mg: 25.02-91.78, Fe: 1.32-4.79, Cu: 0.05-1.30, Zn: 0.34-3.39, Al: 0.41-2.51, Mn: 0.68-4.65 and Pb: 0.063-0.146 mgL^-1. Arsenic was not detectable since it may be less than the detection limit (9.4 mgL^-1). The standard curves showed good linearity with r² between 0.9953 and 0.9999. The mean recoveries of some heavy metals (Fe, Cu and Zn) ranged from 97.9-101.4%, whereas Pb (70.97%) and As (55.62%) gave rather low values. Similar precision was obtained with relative standard deviations for all elements analyzed. Detection (3SD) and quantification (10SD) limits estimated from the noise on the signal obtained for a blank solution were also verified.

Keywords:  Fruit wine; minerals; trace metals; ICP-AES; hydride generation

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