Chemical forms of copper and zinc in the surficial sediments of Borollos Lake, Egypt

Borollos Lake is situated in the northern part of Nile Delta along the Mediterranean coast of Egypt between 31°21'-31°35'N and 30°31'-31°10'E.This work reveals that more than 82% of the total nipper occurs in the residual fraction.Only 4.6%,7.3% and 6.1% of the total nipper occurs in the fractions bound to carbonate,oxides and organic matters,respectively.The exchangeable-Cu is in trace amounts and the other fractions were relatively low in comparison with zinc fractions.The residual fraction of zinc reaches between 66% and 88%.The carbonate-Zn,organic-Zn and oxides fractions range from 1.3% to 7.9%,2.8% to 11.6% and 2.8% to 13.2%,respecticely.There is no pollution by Cu and Zn metals in comparison with the results previously reported for other poVuted Egyptian aquatic environments such as Mariut.