COMPARISON OF CD, CU, NI, AND ZN PARTITIONS IN SOILS OF LONG TERM FERTILITY EXPERIMENTS RECEIVING SEWAGE SLUDGE: 1- FRACTIONATION. | ||
| Journal of Soil Sciences and Agricultural Engineering | ||
| Article 9, Volume 28, Issue 1, January 2003, Pages 703-718 PDF (4.63 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jssae.2003.243984 | ||
| Author | ||
| S. H. Badawy, | ||
| Soil Science Department, Faculty of Agriculture, Cairo University, Giza, Egypt. | ||
| Abstract | ||
| The present study was conducted to investigate the chemical fractions of heavy metals in six different soil experiment locations which received sewage sludge for long time. The total contents of In, Cu, Ni and Cd, as average of all soils were 251,83.5, 29.6 and 2.11 ug/g, respectively. The distribution of various fractions for all metals (as % from total content) followed the order: Exchangeable; 2.5 for In, 1.6 for Cu, 2.2 for Ni and 2.8% for Cd < Carbonate; 10 for In, 11 for Cu, 9.7 for Ni and 11.4% for Cd < Oxides; 14 for In, 14 for Cu, 11 for Ni and 11 % for Cd < Organically complexes; 21 for In, 39 for Cu, 25 for Ni and 24% for Cd. The soluble, exchangeable, organically and oxide forms of In, Cu, Ni and Cd represented a negative relationships with soil pH. However, the Carbonate form showed a positive relationship with soil pH and CaC03 contents. The soluble form of metals represented a small percentage of total contents (0.37 for Zn., 0.15 for Cu, 0.46 for Ni and 0.25% for Cd). A highly significant correlation (R2 = 0.98, 0.98, 0.96, 0.92, p < 0.01, for In, Cu, Ni, and Cd, respectively) was obtained between soluble and exchangeable forms. | ||
| Keywords | ||
| heavy metals; cadmium, copper, nickel, zinc; fractionation; swage sludge | ||
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