Potentiometric stripping analysis of selected heavy metals in biological materials
- 1 January 1993
- journal article
- Published by Wiley in Molecular Nutrition & Food Research
- Vol. 37 (3) , 220-225
- https://doi.org/10.1002/food.19930370305
Abstract
Different biological materials such as edible oils, refined and unrefined cane and beet sugar and tea (black and green) leaves were assayed for the heavy metals cadmium, copper, lead and zinc. The results revealed significant differences in heavy metal contents within each class of the biological materials (P < 0.05). Cadmium was not detectable in sugar samples. Among the oils, highest amounts of copper (0.263 μg/g) and lead (0.154 μg/g) were in corn oil and zinc in olive oil (3.01 μg/g) whereas cadmium exhibited a narrow range (0.023–0.033 μg/g). The samples of beet‐sugar generally contained higher levels of the heavy metals than cane‐sugar. Black and green tea leaves contained 0.411–0.908 μg Cd/g, 6.500–9.220 μg Cu/g, 2.200–5.238 μg Pb/g, and 14.500–25.180 μg Zn/g. Inverspolarographische Bestimmung ausgewählter Schwermetalle in biologischen Materialien Unterschiedliche biologische Materialien wie Speiseöle, raffinierte und nichtraffinierte Rohr‐ und Rübenzucker sowie Teeblätter (schwarz und grün) wurden hinsichtlich der Schwermetalle Cadmium, Kupfer, Blei und Zink untersucht. Die Ergebnisse zeigten signifikante Unterschiede in den Schwermetall‐gehalten innerhalb jeder Klasse der biologischen Materialien (P < 0,05). In Zuckerproben war Cadmium nicht nachweisbar. Bei den Ölen waren die höchsten Mengen an Kupfer (0,263 μg/g) und Blei (0,154 μg/g) in Maisöl, an Zink (3,01 μg/g) in Olivenöl zu verzeichnen. Die Cadmiumgehalte der drei Öle lagen in dem engen Bereich von 0,023–0,033 μg/g. Rübenzucker wies im allgemeinen höhere Schwermetallgehalte auf als Rohrzucker. Die Blätter von schwarzem und grünem Tee enthielten 0,411–0,908 μg Cd/g, 6,500–9,220 μg Cu/g, 2,200–5,238 μg Pb/g und 14,500–25,180 μg Zn/g.Keywords
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