STUDIES ON SOME HEAVY METALS CONTENT IN POLLUTED SOILS AND THEIR ACCUMULATION IN PLANTS | ||||
| Journal of Soil Sciences and Agricultural Engineering | ||||
| Article 2, Volume 30, Issue 5, May 2005, Page 2921-2935 PDF (626.03 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jssae.2005.227517 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| S.H. Badawy1; M.E. Husein1; S. A. El-Gendi2; E.M. Abd El-Razek2 | ||||
| 1Soil Science Dept., Faculty of Agric., Cairo University, Giza- Egypt. | ||||
| 2Soil and Water& Environment Res. Inst. Giza- Egypt. | ||||
| Abstract | ||||
| The present study was conducted to investigate the accumulation of some heavy metals (Cd, Cu, Pb and Zn) in soils and plants with different sources of pollution. The soil samples were collected from 3 sites from each of El-Gabal EL-Asfar, Abou-Rawash, and Helwan areas which received sewage sludge and sewage effluent for a long time. Also, one soil sample from Helwan was collected to represent the contamination by industrial waste.The plant samples were taken from the same location of soil samples. Soil pH and total carbonate content (TCC) are slightly decreased as the irrigation period increased. However, organic matter increased. Total, bioavailable contents of Cd, Cu, Pb, and Zn of soils, increased as the irrigation period increased. Total contents exceeded, in many cases, and/ or reached, in some ones, the maximum permitted loadings. DTPA-extractable Cd, Cu, Pb and Zn increased continuously in the studied areas which received sewage sludge, sewage effluent and industrial materials for a long time. Bioavailable portions were found to represent a great deal of the total contents. The low percentage of total extracted by DTPA is due to its precipitation as CaCO3. These results give an evidence of high availability of sewage effluent burden-metals to plants. There are negative correlation confections between DTPA extractable -Cd and each of pH and CaCO3; and a positive correlation confections with total, organic matter and clay contents. The concentrations of Cd, Cu, Pb and Zn in different plant organs increased with increasing the irrigation time period of sewage effluent and both sewage sludge and industrial material applications to soils. The absolute values of these metals in plant organs are different from metal to another, depending on the sewage sludge content and the availability of these metals in the soil which are controlled by different soil parameters (CaCO3, pH, clay and organic matter). The values of these metals followed the order Cd < Pb < Cu < Zn. The obtained results indicate that the heavy metals accumulation in leaves or straw higher than edible parts (grains or seeds) of plants. This is due to the low translocations of these metals in plants. | ||||
| Keywords | ||||
| Sewage effluent; heavy metals; Cd; Cu; Pb; Zn; accumulation | ||||
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