I-Determination of Lead and Cadmium in Food by Anodic- Stripping Voltammetry II- Oxidation of Galactose

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Type: 
Thesis
Year: 
2004
Students: 
Shadi Abdel-Qader Suleman Mousa
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I-Determination of Lead and Cadmium in Food by Anodic- Stripping Voltammetry II- Oxidation of Galactose453.65 KB
Abstract: 

In part (І) trace metal concentrations in food, cigarettes and water was determined. Reprehensive samples were taken during May- August 2003.Food samples were digested and then analyzed for their contents of lead and cadmium. Samples were analyzed using anodic stripping voltammetry, which considered being sensitive compared to other methods used in determination of heavy metals. The results showed very low concentrations that were below the safe limits of lead and cadmium set by the WHO. In part (ІІ) reaction of galactose with potassium hexacyanoferrate (ΙΙΙ) in alkaline medium was studied at constant temperature and ionic strength.Stoichiometric studies showed that for each mole of galactose oxidized, two mole of potassium hexacyanoferrate (ΙΙΙ) were reduced to produce galactonic acid. The dependence of rate on the concentration of each of galactose, heacyanoferrate (ΙΙΙ) and hydroxide ion was determined. The reaction followed first order rate dependence on both; galactose and hydroxide ion and the rate was independent of