Assessment of some heavy metals pollution in some soils of Egypt [electronic resource].

Includes reference.

The study represents an attempt to ascertain some of possible reactions of some heavy metals (Cd, Cu, Ph and Zn) in a sludge soil (Abu-Rawash farm), and an industrial contaminated soil, near to the Industrial Complex, Helwan City. The obtained results of thepresent study indicate that soil -pH and total carbonate content (TCC) slightly decreased in the two tested soils. However, clay content and organic matter content were increased in the sludge soil due to the organic and sediment materials existed in the sewage effluents, The results also reveal that the total content (through the profile) for the tested.heavy metals in the sludge soils may be ranked descending as follows (in mglkg) Zn (492.42), Cu (54.66) Ph (52.27) and Cd (5.48). Meanwhile in the industrial- contaminated soil they ranked as; (in mglkg) Zn (102.08) Pb (85.9) Cu (45.66) and Cd (7.06) . Also, the DTPA-extractable metals may be ranked in (mglkg) as follows; Zn(12.59),Cu(12.55). Ph (0.84) and Cd (0.25). Meanwhile, in the industrial ..,. contaminated soil, they ranked as follows: Cu(1.06), Zn(4.54), Ph (1.37), Cu(1.06) and Cd (0.19) mglkg. The results also indicate that the content of the tested metals may by arranged decendingly as; Cd > Ph > Cu > Zn and Ph > Cd = Cu > Zn in the sludge and the industrial- contaminated soil, respectively. The studies of fractionation showed that residual (32.5%), organic fraction (29.06%) dominates the sludge soil followed by carbonate (19.31%) > oxide (12.06%) >exchangeable (6.15%) of their sum. Meanwhile, in the industrial- contaminated soils these fraction could be arranged according to their magnitudes as residual =oxide (27%» carbonate (21.35%) >exchangeable = organic (11%). On a mean basis, the results also indicated that the active portions of Cd2+ in the tested soil on a mean basis in (pM=-log Cd2 ") were; 8.534 and 8.093 in the sludge soil and the industrial contaminated soil, respectively .

Summary in Arabic.

1