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Speciation of Phosphate, Fe, Zn, Mn, Cu and theirAvailability in Soils Amended with Sewage Sludge
| Content Provider | Hyper Articles en Ligne (HAL) |
|---|---|
| Author | Chouliaras, Nicolas Vedy, Jean Claude Christos, Tsdailas |
| Copyright Year | 1998 |
| Abstract | Urban sludge was applied in both Ap and Bt horizons of a red soil and in Ap horizon of a calcareous soil; the corresponding pH values of these soils were 4.82, 7.34 and 8.38. The rates of sludge applied were 0, 1.8, 3.6, and 5.4 g of air dried sludge per 100 g of soil. The samples were maintained in a temperature of 28 o C for 9 weeks at 2/3 of water holding capacity. At the end of the incubation period an extraction procedure was applied, with 0,1N NaOH in order to extract P bound to Fe and to Al, and with HCl 1N in order to remove P bound to Ca. In addition, to approach the partition of Fe, Zn, Mn and Cu into the soil fractions, a sequential fractionation was applied, so metals were extracted with KNO 3 (exchangeable forms), NaOH 0.5N (organic forms), Na 2 EDTA 0.05M (precipitated forms), and with 4.0 M (residual forms). The liming effect of the used sludge was mostly effective on the pH of the acid horizon, and available-P (Olsen) increases with increasing rates of sludge. In acid Ap horizon a large amount of P was found in forms bound to Fe and Al minerals, but in the neutral Bt horizon and in the calcareous soil the important amounts of P were found bound to Ca for all soil treatments. Most Fe and Mn were included in the residual forms, as far as the samples with the high rate of sludge are concerned. Sludge applied caused significant reduction in Fe and Mn extracted by DTPA in Ap horizon of the red soil; no significant effects have been observed in Bt horizon, and the same was observed in the calcareous soil for Mn; on the contrary, sludge affected positively Fe extracted by DTPA in the calcareous soil. Appreciable portions of Cu were in organic forms and in the high rate of sludge, a large fraction of Zn was in Zn-EDTA. Sludge affected positively Zn and Cu extracted by DTPA in all tested soils. |
| Related Links | https://hal.science/hal-03175795/file/PAPER-full-isss-98.pdf |
| Conference Proceedings | Conference: 16th world congress of Soil Science |
| Language | English |
| Publisher | HAL CCSD |
| Access Restriction | Open |
| Subject Keyword | phosphate partition metal partition sewage sludge |
| Content Type | Text |
| Resource Type | Conference Proceedings |
| Subject | Environmental Science |
