University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Walter Berger
(2004):
Sequential Extraxtion Procedures and Dsorption Studies of Trace Metals from Soils treated with Metal-Amended Sewage Sludge.
Master / Diploma Thesis,
BOKU-Universität für Bodenkultur.
UB BOKU
obvsg
- Abstract:
- The total concentration of heavy metals is not sufficient to assess the potential impact of polluted soils. The chemical binding form of a metal is of major importance for its potential mobilization. For this reason, sequential extraction procedures (SEPs) are used to evaluate their behavior in the environment and their mobilization capacity. The overall objective of this study was to examine the potential for metal leaching from soils with long-term application of sewage sludge using a continuous extraction technique in comparison with a conventional batch extraction procedure. A second objective was to examine metal desorption and to compare the leached metals with the first two steps of the sequential extraction procedures. Copper, Ni, and Zn of soils treated with sewage sludge found at the Canterbury Plains in New Zealand were investigated. In comparing results of the total digest and the batch sequential extraction, the recoveries were generally within ±10%. The elements proved to be predominantly bound to Fe-Mn oxides, organic matter and the residual fraction. The continuous flow SEP is currently no good alternative to the traditional batch SEP. This is due to the filter blockages and breaching during the extraction procedure. Only the recovery of Cu showed good agreement to the total metal concentration. The distribution of Cu among the fractions using batch extraction corresponded well to literature data. Continuous desorption dissolved less metals than the first two fractions of the batch and continuous SEPs.
- Beurteilende(r): Wenzel Walter