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Addis Ababa University Libraries Electronic Thesis and Dissertations: AAU-ETD! >
Faculty of Technology >
Thesis - Food Engineering >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/123456789/2091
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| Title: | Determination of the levels of essential and toxic metal constituents in cow's whol milk from selected sub-cities in addis ababa ethiopia |
| Authors: | Dawd, Gashu |
| Advisors: | Prof. Negussie Retta
Dr. Gulelate Dessie |
| Keywords: | FA-AAS
Whole cow milk
Chromium
Nickel
Lead
Cadmium
Iron
Zinc |
| Copyright: | Jun-2010 |
| Date Added: | 2-May-2012 |
| Publisher: | aau |
| Abstract: | Whole milk samples were collected from 32 dairy farms found in Akaki-Kality, Bole, Kolfe, and
Yeka sub-cities of Addis Ababa using prewashed polyethylene bottle. Whole milk samples were
kept in an ice box and transported to EHNRI, Traditional and Modern Drug Research laboratory
and kept in -20oC. The frozen samples were freeze dried in a freeze drying unit until a constant
mass was achieved. The freeze dried samples were digested by wet ashing method using
Conc.HNO3 and HClO4 in Kjeldahl apparatus. The digested were diluted by deionized water in
to a volume of 50ml.The level of essential (iron, zinc, nickel and chromium) and toxic (lead and
cadmium) metals in the samples was determined by FA-AAS.
Statistical analysis was performed using SPPS version 17. The data were subjected to one way
ANOVA using Duncan’s multiple range test. Contents of essential minerals were found to be in
the normal range with other countries, while most of samples were below detection limit for
chromium. Comparing the level of Pb and Cd in samples of the present with the acceptable
limits, they were found to be beyond the limit. The average concentrations of the elements were
Zn (4.923±0.277 mg/kg), Fe (1.213±0.077 mg/kg), Pb (0.998±0.251 mg/kg), Ni (0.784±0.054
mg/kg), Cd (0.100±0.006 mg/kg), Cr (0.036±0.004 mg/kg).
Significant difference was not observed among the four sub cities with respect to iron, nickel,
and cadmium content. Pb content of samples from Bole and Akaki-kality subcity was not
significantly different, and also samples from Kolfe and Yeka subcities were significantly
different with respect to their Pb content. The Zn content of samples from Bole, Kolfe, and Yeka
were not significantly different. But Zn content of whole cow milk samples from Akaki-Kality
were significantly different from Bole and Yeka but not with Kolfe (P = 0.05). |
| URI: | http://hdl.handle.net/123456789/2091 |
| Appears in: | Thesis - Food Engineering
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