ESTIMATION OF SOME HEAVY METALS IN MEAT, liVER AND KIDNEYS OF SHEEP DRINKING WATER POLLUTED WITH SEWAGE IN SOME VILLAGES OF ASSIUT GOVERNORATE

摘要

The present work was planned to study the pollution of water with heavy metals in some drainage canals in which the sewage waste water was directly discharged at certain villages of Assiut Governorate. In addition, the study was planned to detect theresidues of heavy metals in tissues and organs of sheep drinking from this polluted water. 20 water samples were collected from polluted canals and 10 water samples were collected from fresh tap water. In addition, samples were collected from carcasses of sheep (aging ranged from 4 to 5 years) with number of 35 of muscles, livers and kidneys from sheep previously drinking polluted water with sewage and 10 samples of muscles, livers and kidney were collected from carcasses of sheep previously drinking fresh tap water from the same villages and used as a control. All tissue samples were collected from different slaughter houses in certain villages and, cities at Assiut Governorate. Samples were prepared and analyzed for determination of lead, cadmium, copper and zinc concentrations by using Atomic Absorption Spectrophotometer. The obtained results revealed that the presence of lead, cadmium, copper and zinc in water of canals polluted with sewage were highly significant elevated than those in tap waterand higher in its concentrations than the international permissible limits. Concerning the levels of lead, cadmium, copper and zinc in muscles, kidneys and livers of sheep drinking polluted water were highly elevated than those of sheep drinking tap water. The highest concentrations of lead and cadmium were detected in all examined tissues and organs of sheep drinking polluted water, while the highest concentrations of copper were detected in muscles, liver, then kidneys of sheep drinking polluted water, which were also higher than the international permissible limits. Also the values of zinc in all examined tissue samples of sheepdrinks polluted water were exceeded the permissible international limits. It was evident from these results that there was a correlation between accumulation of heavy metals in tissues of sheep and its concentration in water. Public health importance andthe hazardous toxic effects of these heavy metals, as well as the suggestive recommendations to minimize pollution with these heavy metals were discussed.