Evaluation Of The Concentration Of Lead Essay

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Estimation of heavy Metal (Lead, Chromium, Cadmium, Zinc, Copper, Arsenic) in Fresh Milk by AAS (Atomic Absorption Spectrometer) খসড়া Abstract: This project was aimed to measure the concentration of Lead (Pb), Chromium (Cr) and Cadmium (Cd), in brands of full cream powder milk available commercially in Harar using Atomic Absorption spectrometer. To this effect samples of three different brands of full cream milk powder were collected from Harar local market, Each of 3 ml of fresh milk samples were wet digested in 5ml of HNO3 (69-72%) and 3ml HClO4 (70%) for 2:30 h at a temperature of 210 0C. The wet digestion procedure was tested by varying reagent volume, digestion time and digestion temperature to develop a procedure that consume less reagent volume, clear solution, that requires minimum digestion time and minimum digestion temperature applied. The concentrations of heavy metals (Pb, Cr and Cd) in the powder milk collected from Harar were determined by using flame Atomic Absorption spectrometer. Concentration of Lead, Chromium and Cadmium in the powder milk brands were found to be in the range: 0.038-0.1688ppm, 0.0597-0.222ppm, and ND for sample X and Z but 0.068ppm for sample Y, respectively. The accuracy of the optimized procedure was evaluated by analyzing the digest of the spiked samples. The recoveries of the metals were in the range of 95.91-99.3% and the standard deviations were less than 10%. These values are compared with recommended dietary allowance (RDA)
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