Determination of the levels of Selected Essential and Toxic Metals in Canned Tomato Paste
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Date
2009-07
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Addis Ababa Universty
Abstract
In this study, a reliable digestion procedure for the analysis of tomato paste was
optimized and levels of selected essential metals (Zn, Fe, Cu and Mn) and toxic metals
(Pb and Cd) were determined in four tomato paste of local origins using Atomic
Absorption Spectrometry. The results showed that the zinc concentration in the four
tomato paste examined ranged between 2.54 – 6.63 mg Kg-1, iron between 63.11 –
96.10 mg Kg-1, copper 6.95 mg Kg-1, manganese between 11.5 – 23.02 mg Kg-1, and
cadmium between 0.511 – 1.22 mg Kg-1. The results are also compared with
International Standards. The cadmium content obtained showed that the level is higher
than the FAO/WHO limits.
Key words: Tomato paste, metals, Flame Atomic Absorption Spectrometry
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Keywords
Tomato paste; metals; Flame Atomic Absorption Spectrometry