Estimation of Lead and Copper Levels in Milk

Abstract

Lead and copper levels were determined in 96 samples of milk and twelve milk samples were individually collected from buffaloes, cows, goats, ewes, adult and infant dried powder milk, liquid pasteurized milk and condensed milk from different regions and Local markets of Mosul city, during the period from October 2011 to March 2012. The findings referred to the presence of lead and copper in the concentration of 0.623 and 0.590, 0.566 and 1.323, 0.191 and 0.640, 0.152 and 0.593 mg/kg in the buffalos, cows, goats and ewes, milk, respectively. The percentage of milk samples exceeding the permissible limits 100% of lead and copper in buffalos' milk and lead in cows' milk and 83.3% for lead in ewes' milk and for copper in cows, goats and ewes' milk and 66.6% for lead in goats milk. The results showed that the mean concentration of lead and copper 0.524 and 0.824, 0.127 and 0.958, 0.323 and 0.375, 1.402 and 0.462 mg/kg in the adult dried powder, infant, pasteurized and condensed milk, respectively. Milk samples which exceed the permissible limits of lead 100% in adult dried, pasteurized and condensed milk and for copper in the infant and adult dried powder milk and 83.3% for lead in the infant milk and 33.3%, 16.6% for copper in pasteurized and condensed milk. The findings showed no significant differences in the mean concentration rates of lead and copper among all types of raw milk in study. However, there was a significant difference in the mean concentration levels of copper between adult and infant milk from pasteurized and condensed milk.