Determination of heavy metals in concentrated refined sugar and raw syrups with differential pulse polarography and anodic stripping voltammetry

摘要: The behavior of copper, lead, cadmium, and zinc is investigated in concentrated solutions refined beetroots sugar. diffusion coefficients are found to decrease less than predicted by the Walden's rule, so trace determinations down 10−7 M were measured differential pulse polarography (DPP). Using anodic stripping voltammetry at a mercury film electrode, it was that sugar alimentary grade contained: 57 (Cu), 34 (Zn), 1 (Cd), 6 (Pb) μg/kg dry For industrial syrups, resulting from treatment lime water vapor raw material, some problems encountered. Determination copper impossible, while lead cadmium possible after one liter diluted syrup, about 250 g l−1, had been treated with 20 activated carbon absorb major part organic impurities. contents be 3.5 (Cd) μg kg−1.