2024-03-28T17:37:33Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/529412016-02-17T09:21:12Zcom_10261_50com_10261_8col_10261_429
Efficiency of Cd, Zn and Pb immobilization by soil amendments immediatel y after their application
Pérez Sanz, Araceli
Lobo, M. Carmen
Pastor Piñeiro, Jesús
Vangronsveld, Jaco
Zn
Cd
Pb
Steel shots
Cyclonic ash
8 páginas, ilustraciones y tablas estadísticas.
The objective of this work was to evalúate the effectiveness of amendments in a
contaminated soil to be restored using phytostabilization, immediately after the
application of the additives. Metal concentration in pore-water was determined as metal
bioavailability parameter. Fractionation on carbonate and exchangeable phases were
also performed as an additional parameter to evalúate metal bioavailability in soil.
The studied soil originated from an abandoned open-cast mine in Toledo (Spain). Total
Pb, Cd and Zn concentrations were higher than the threshold valúes of the Spanish
legislation. Different additives were evaluated in a greenhouse experiment: two types of
cyclonic ashl modified alumninosilicates originating from two different coal burning
electricity piants using fluidised bed technology and steel shots, mainly consisting of ¡ron
oxides. Two weeks before sampling, pots were wetted at 50 % the water retention
capacity with distilled water. Samples were taken after 15, 60, 100 and 205 days. Pore
water extracts (Rhizon sampler) were analysed for determine Zn, Cd and Pb (ICP-AES).
Soil samples were taken to evalúate pH, electrical conductivity total, exchangeable and
carbonate adsorbed metáis. At the end of the experiment, piants that spontaneously
colonised the soil were harvested to assess Zn, Cd and Pb (ICP-AES) in the biomass.
Immediately after the application of the additives, metal concentration ¡n pore water and
exchangeable phase decreased was confirmed by Zn and Cd absorption by the piants.
All these parameters seem to support that the presence of cyclonic ash improves the
association of Zn and Cd to the less mobile phases. Although the Pb in the pore water
solution decreased and the exchangeable fraction and the fraction specifically adsorbed
to carbonates did not increase in soils treated with additives, the valúes found in plant
questioned that this metal was immobilised in soils.
2012-07-09T06:45:12Z
2012-07-09T06:45:12Z
2004
artículo
Proceedings of the First International Meting on Environmental Biotechnology and Engineering, Méjico sept 6-8:1-8 (2004)
970-941 112-0-9
http://hdl.handle.net/10261/52941
eng
openAccess