Please use this identifier to cite or link to this item:
Title: Urban agriculture in Portugal: availability of potentially toxic elements for plant uptake
Author: Cruz, N.
Rodrigues, S. M.
Coelho, C.
Carvalho, L.
Duarte, A. C.
Pereira, E.
Römkens, P. F A M
Issue Date: 2014
Publisher: Elsevier
Abstract: Soils from urban areas often contain enhanced pseudo-total levels of potentially toxic elements (PTEs). Considering the expanding tendency of urban agricultural practices it is necessary to understand if these contaminants are available for plant uptake and if they pose risks to animal and human health. This study showed that estimates of Daily Intakes (DIs) of Cu, Pb and Zn for grazing animals were above animal Acceptable Daily Intakes (ADIs) at specific sites under the influence of an airport, an oil refinery and near highways with high traffic rates in the "Grande Porto" urban area (Portugal). These results suggest that there is a potential for dietary transfer of contaminants associated with the ingestion of both contaminated soil and feed by cows and sheep at unacceptably high concentrations.Furthermore, results showed that 40% of variability of ryegrass shoot contents of Cu, Pb and Ni; 60% for Ba; 70% for Zn; and 80% for Cd can be significantly (p<. 0.01) explained by the variability of the corresponding chemical available pools in soils. Since the chemical available pools of PTEs in urban soils were rather low when compared with the corresponding pseudo-total pools (median 0.1-5%) and even when compared with the corresponding reactive pools it is advised to perform further research on the conditions and time span for the limited availability of PTEs in urban soils, and to determine under which conditions PTEs on reactive forms may become available.
Peer review: yes
DOI: 10.1016/j.apgeochem.2013.07.003
ISSN: 0883-2927
Appears in Collections:CESAM - Artigos
DQ - Artigos

Files in This Item:
File Description SizeFormat 
Cruz et al. - 2014 - Urban agriculture in Portugal Availability of pot.pdf1.1 MBAdobe PDFView/Open    Request a copy

FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.