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The Scientific World Journal
Volume 2014, Article ID 715845, 5 pages
Research Article

Comparative Study of Heavy Metals in Dried and Fluid Milk in Peshawar by Atomic Absorption Spectrophotometry

1Centre of Biotechnology & Microbiology, University of Peshawar, Peshawar 25120, Pakistan
2Department of Chemistry, COMSATS Institute of Information Technology, Abbottabad 22060, Pakistan
3Department of Nutrition, College of Home Economics, University of Peshawar, Peshawar 25120, Pakistan
4Department of Environmental & Soil Sciences, Agricultural University, Peshawar 25120, Pakistan

Received 21 February 2014; Revised 16 April 2014; Accepted 21 April 2014; Published 20 May 2014

Academic Editor: M. Carmen Yebra-Biurrun

Copyright © 2014 Ghosia Lutfullah et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Various essential and toxic heavy metals (Ca, Mg, Cu, Zn, Fe, Mn, Pb, Cd, Cr, and Ni) contents in various types of dried (infant formula and powdered) and fluid (fresh and processed) cow milk were assessed by atomic absorption spectrophotometry. The milk samples were collected from local markets of different parts of Peshawar city, Pakistan. Heavy metal concentrations varied significantly depending upon the type of milk. The heavy metal concentrations in most of the samples were within normal and permissible ranges. It was observed that the samples contained considerable amounts of calcium, while magnesium levels were well above the required levels. The results also revealed that copper levels were slightly lower than the permissible limits. The concentration of zinc in dried milk samples was greater than the values for the liquid milk types. Infant milk formulae had higher iron levels as compared to other milk samples because of the added constituents. Significant differences were observed in the mean values of manganese and cadmium in different types of milk. The toxic metals were within the acceptable limits and did not show significant levels leading to toxicity.