abstract
Eleven composite soil samples, developed either on schist materials or fine heterogeneous waste materials and coarse metallurgical slags, were collected in the Bracal (Portugal) abandoned lead mine. Plants growing in each sampling area were identified. A total of 49 plant samples of eight species -Acacia dealbata Link, Acacia melanoxilon R. Br., Cistus inflows Pourr. ex Demoly, Erica arborea L. Eucalyptus globulus Labill., Pinus pinaster Aiton, Quercus robur L, and Ulex minor Roth - were collected. This study intends to evaluate the available fraction of aluminium, lead, manganese, and zinc in the soils using dry and moist samples in contact with five extractant solutions, degasified distilled water, and calcium chloride, calcium nitrate, ammonium acetate and DTPA aqueous solutions, and to compare together these results with the total elemental amounts in the aboveground part of the plant species. The available fraction is higher in moist than in the dry soil samples. The correlations between the soil available fraction of the elements and its concentration in the plants suggest that DTPA is not the best extractant for lead bioavailability evaluation. Variable results were observed for the bioavailable fraction of the elements evaluation suggesting that, in multielemental contaminated soils, calcium chloride seems to be a good extractant medium, once it correlates with the higher number of plant species. (C) 2011 Elsevier B.V. All rights reserved.
keywords
RHIZOSPHERE-BASED METHOD; TRACE-ELEMENTS; HEAVY-METALS; COEXISTING SPHALERITE; CONTAMINATED SOILS; SAO-DOMINGOS; PHYTOAVAILABILITY; BIOAVAILABILITY; MANGANESE; ENVIRONMENTS
subject category
Geochemistry & Geophysics
authors
Anjos, C; Magalhaes, MCF; Abreu, MM
our authors
Maria Clara Ferreira Magalhães
Emeritus Professoracknowledgements
We would like to thank the Portuguese Foundation for Science and Technology for financial research support of CICECO.