Abstract
This study estimated the residues of some heavy metals of toxicological concern in milk. One hundred and fifty samples from dairy farm, market raw milk and vendors milk were collected from Zagazig City. Collected samples were examined for presence of lead (Pb), cadmium (Cd), mercury (Hg) copper (Cu) and Zinc (Zn) by using atomic absorption spectrometry. The mean concentrations were 0.716, 2.001, 2.11 for Pb; 0.871, 3.39, 4.11 for Cd; 0.911, 5.79, 6.37 for Hg; 2.81, 7.21, 7.72 for zinc and 2.111, 4.44, 4.45 (ng/L) for copper in farms, markets and vendors milk samples, respectively. The percentages of significant dairy farms, market milk and vendor samples exceeded the maximum permissible limits were 30, 44 and 52% for lead, 26, 100 and 100% for cadmium, 12, 22 and 28% for mercury, 22, 26 and 32% for zinc, 50, 90 and 96% for copper. The statistical analysis regarding the data obtained from farms, markets and vendors milk revealed a low moderate and high significant differences in lead, copper, cadmium, mercury and zinc respectively. The public health and suggest precaution to minimize the level of such heavy metals in milk were discussed.
Highlights
Inorganic or aggregated forms of chemical substances in feed and food represent a severe risk for their long term toxicological effects
Extraction of heavy metal according to Lameiras et al (1998): Milk samples were extracted by adding 4ml of the prepared sample into polyethylene bottle with 10ml suspension solution composed of 0.5g ammonium dihydrogen phosphate, 20ml ethanol, 50ml concentrated hydrogen peroxide and one ml concentrated nitric acid to 100ml deionized water
The percentages of the examined farm, market raw milk and vendors milk samples that exceeded the maximum permissible limits were in Table (4) 30, 44 and 52 for lead, 26, 100 and 100 for cadmium; 12, 22 and 28 for mercury; 22, 26 and 32 for zinc; 50, 90 and 96 copper
Summary
Inorganic or aggregated forms of chemical substances (metalloids, heavy metals etc..) in feed and food represent a severe risk for their long term toxicological effects. The toxicity induced by excessive levels of some of these elements such as cadmium (Cd), lead (Pb), Zinc (Zn) and mercury (Hg) are well known (Kabzinski, 1998). Heavy metals of toxicological concern are lead (Pb), cadmium (Cd), mercury (Hg), copper (Cu) and Zinc (Kabzinski, 1998).
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