Al had a highest detected level of (2.74 ppm). As for the essential
metals, Se and Zn had highest levels of (0.09 ppm and 31.64 ppm)
consecutively, followed by Cu (5.013 ppm). Malhat et al. in 2012
reported lead and cadmium had mean levels of 4.404 and 0.288
ppm correspondingly, in cow milk collected from different sites in
El-Qaliubiya governorate, Egypt. These levels are less than values
detected in the current study for Pb and Cd simultaneously (7.421,
and 5.013 ppm). Fatima et al. in 2005, reported that the Pb was
determined in their studied samples, but with concentrations well
below the limit defined by WHO in 2006. Based on the notifications
from the Agency for Toxic Substances and Disease Registry
(ASTDR 2006), regarding the determination of the maximum
levels of contaminants in food products, Al content should
not exceed l5mg/kg. (ASTDR 2006) According to many authors,
Al dietary intake must not exceed 6 mg/day to avoid its potentially
toxic effects. (Ysart G et al. 2000, Navaro I and Alvarez JI 2003)
Dietary Al intake in USA was estimated by Pennington and
Schoen in 1995, to be 0.7-11.5 mg/day in children, 8-9 mg/day in
adult males and 7 mg/day in adult females. Ysart et al. in 2000
estimated the mean dietary Al intake in the United Kingdom as 3.4
mg/day. A tolerable daily intake (TDI) for Al of 1 mg/kg of body
weight per day has been established by an international committee
of experts under the auspices of the WHO in 2006.