IMPACT OF IRRIGATION WITH SEWAGE WATER ON CALCAREOUS SOil: 11- HEAVY METAL SPECIATION IN SOIL. | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 7, Volume 29, Issue 11, November 2004, Pages 6685-6700 PDF (4.47 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2004.243910 | ||
| Authors | ||
| A. A. Abdel Salam,1; F. F. Assaid2; F. F. Miniasy1 | ||
| 1Dept. of Soil and Water Sci., Faculty of Agriculture, EI-Shatby, Alexandria University | ||
| 2National Research Center, Cairo, Egypt. | ||
| Abstract | ||
| Soil samples were collected from experimental fields plots irrigated with raw I sewage water for different periods (3, 10 and 30 years) to investigate the solid-phase I speciation of Cu, Zn, Cd, Ni and Pb in calcareous soil. A sequential extraction procedure was used to fractionate heavy metal into designated forms of exchangeable (Exch.), sorbed (Sorb.), organically bound (Org.), precipitated (Prec.) and residual (Resi). The obtained results showed that the residue fraction was the most abundant fraction in the control soil for all studied metals , followed by the precipitated ( carbonate) fraction, while in the waste water irrigated soil, the average highest metal fraction, as percentage of total, was recorded as fellows: org -bound for co. preci.-bound for Pb and resid. form for Zn, Cd and Ni. The distribution of solid ...! phase metals in the different fractions did not significantly change as a result of sewage water irrigation. In some cases, metals in soils irrigated with sewage water tended to shift from less to more soluble forms. according to the period of irrigation with sewage water. | ||
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