Publications

Titles

English :

Fractionation and accumulation of some heavy metals in soil and plants irrigated with sewage effluent

Arabic :

الصور الكيماوية المختلفة لبعض العناصر الثقيلة بالأرض والنبات المروية بمياه الصرف الصحى

Abstract

Surface soil samples (0-20 cm) were taken from two sites located at Abou-Rawash farm, Giza Governorate to determine the forms of selected metals in the solid phases. The first site was irrigated with sewage water effluent for 7.0 yr. period, while the second site was selected to be as a background reference of the area. Corn plants were grown on the soils. The selected soil samples were analyzed for total Cd, Pb, Ni, and Co contents. These metals were sequentially extracted into operationally defined geochemical fractions: exchangeable, bound to carbonate, bound to Fe-Mn oxides, bound to organic matter, and residual forms . The soil irrigated with sewage effluent showed elevated total contents of the tested metals; Pb (147.4) > Cd (85.87) > Ni (37.38), and Co (10.97) g/g. On an average basis, metal recoveries were less than the total independently determined total metals content by 9%. In uncontaminated soil, the highest amount of Cd and Pb (35%) was associated with Fe & Mn oxides fraction, while the organically bound fraction was the dominant form of Co (65%) and of Ni (35%).In sewage water effluent-treated soil, the organically bound fraction was the dominant form throughout the tested metals, its accounts 31, 39, 43, 55 % of the sums of Ni, Cd, Co, and Pb, respectively Corn plants which grown to maturity in the selected soils were sampled into foliage and grains. In the foliage, Ni (10.8 µg/g) showed the highest concentration among the tested metals followed in decreasing order by Pb, Co, and Cd. Also, the tested metals may have the ability to remmobilized to the grains (except Pb to somewhat). In the grains, Ni, Co, Cd, and Pb were 26, 23, 10, and 1.5 times greater than the typical for uncontaminated soil

Publication year

1999

Pages

211-221

Availability location

Soils, Water and Environment Research Institute, ARC, 9 Cairo Univ. St., Giza, Egypt

Availability number

Organization Name

Soil, Water and Environment Research Institute (SWERI)

City

Zagazig

serial title