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Bioavailability as a Factor in Risk Assessment of Metal-Contaminated Soil

Artikel i vetenskaplig tidskrift
Författare E. E. V. Chapman
Göran Dave
J. D. Murimboh
Publicerad i Water Air and Soil Pollution
Volym 223
Nummer/häfte 6
Sidor 2907-2922
ISSN 0049-6979
Publiceringsår 2012
Publicerad vid Institutionen för biologi och miljövetenskap
Sidor 2907-2922
Språk en
Länkar dx.doi.org/10.1007/s11270-012-1074-...
Ämnesord Soil, Metal, Bioavailability, DGT, Leachate, Wheat, biotic ligand model, thin-films dgt, diffusive gradients, trace-metals, terrestrial environment, chemical speciation, copper availability, heavy-metals, plants, toxicity, ck fmg, 1995, international journal of environmental analytical chemistry, v59, p225
Ämneskategorier Geovetenskap och miljövetenskap

Sammanfattning

To accurately assess the risks of metal contaminants in soil, the bioavailability of the metals need to be considered. The bioavailable concentrations determined from homogenized, dried soils are not necessarily representative of in situ conditions of undisturbed field soils. In this study, we investigated the accumulation of metals in wheat (Triticum aestivum) grown in undisturbed contaminated (Pb, Zn, Cu, and Cd) soil cores, in relation to total soil, leachate, and diffusive gradients in thin films (DGT)-labile metal concentrations. Despite the fact that many of the samples contained metal concentrations above guideline values, no significant effects were observed on wheat growth. The bioavailability of metals in the most contaminated samples was estimated to be medium to low, possibly explaining why few effects were observed in the bioassay. For Cu, Zn, and especially for Pb, leachate and DGT-labile concentrations were better predictors of uptake by wheat than total concentrations based on correlations. It is suggested that DGT and leachate concentrations in combination with bioassays in undisturbed soil cores can be used to account for metal bioavailability in soil. These tests could be used during the ecological risk screening stage, in conjunction with total concentrations and guideline values to better estimate receptor exposure.

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