RT Journal Article
T1 Trace metal extractability and bioaccessibility in urban soils
A1 Roo, María
A1 Herbón Allo, Cecilia
A1 Martín Sanz, Juan Pedro
A1 Barral Silva, María Teresa
A1 Paradelo Núñez, Remigio
K1 Urban soil
K1 Pollution
K1 Metals
K1 Bioavailability
K1 Bioaccessibility
K1 Technosols
AB AbstractPurposeOne of the most challenging issues in urban soils is the accumulation of pollutants such as heavy metals, which could reach the natural waters or enter the food chain through plant uptake. In order to assess the health risk related it is necessary to know their availability.MethodsWe analyzed the chemical extractability of five trace metals (Pb, Cu, Zn, Ni and Cr) in 55 soils from Santiago de Compostela (Spain) with diverse land use (urban grassland, urban forest, urban agriculture) and parent material lithology (granite, schist, gneiss, amphibolite). Soluble metals were evaluated using an extraction with 0.01 M CaCl2, plant-available metals were obtained after extraction with EDTA, and bioaccessibility was assessed following the USEPA in vitro extraction with glycine.ResultsMetal extractability was in general higher in the USEPA method than in EDTA, and much higher than in CaCl2. Among the elements studied, only Zn was detected consistently in CaCl2 extract, with values always lower than 3% of the total contents, in a decreasing sequence Zn > Pb > Ni > Cu > Cr. Concentrations of plant-available metals followed a decreasing sequence Pb > Cu > Zn > Ni > Cr, with values that represented, on average, between 1 and 23% of their total concentrations. Bioaccessibility followed a similar sequence: Pb > Cu > Zn > Ni > Cr, with values that ranged between 2 and 55% of the total concentrations. Plant-available and bioaccessible Cu and Zn were higher in urban garden soils with respect to other uses.ConclusionThe availability of trace metals in these soils is very low and supports previous hypotheses about their sources, with Cu, Pb and Zn coming from anthropogenic pollution and Ni and Cr from natural sources related to the soils parent material.
PB Springer
YR 2026
FD 2026-02-12
LK https://hdl.handle.net/10347/46665
UL https://hdl.handle.net/10347/46665
LA eng
NO Roo, M., Herbón, C., Martín-Sanz, J.P., Barral, M.T., & Paradelo Núñez, R. (2026) Trace metal extractability and bioaccessibility in urban soils, Journal of Soils and Sediments, 26:47, 1-13.  https://doi.org/10.1007/s11368-026-04252-6
NO Open Access funding provided thanks to the CRUE-CSIC agreement with Springer Nature. This study is part of the project TED2021-130970B-I00, funded by the Spanish State Agency for Research (AEI) - MCIN/AEI/https://doi.org/10.13039/501100011033 and the European Union “Next Generation EU”/PRTR. J.P. Martín received funding from Margarita Salas Program, financed by the European Union-Next Generation EU through the Ministry of Universities and the UCM's CT31/21 call for proposals.
DS Minerva
RD 23 abr 2026