Evidence of hexavalent chromium formation and changes of Cr speciation after laboratory-simulated fires of composted tannery sludges long-term amended agricultural soils.

Autor: Rascio I; Department of Soil, Plant and Food Sciences, University of Bari 'Aldo Moro', Via G. Amendola 165/A, 70126 Bari, Italy., Allegretta I; Department of Soil, Plant and Food Sciences, University of Bari 'Aldo Moro', Via G. Amendola 165/A, 70126 Bari, Italy., Gattullo CE; Department of Soil, Plant and Food Sciences, University of Bari 'Aldo Moro', Via G. Amendola 165/A, 70126 Bari, Italy., Porfido C; Department of Soil, Plant and Food Sciences, University of Bari 'Aldo Moro', Via G. Amendola 165/A, 70126 Bari, Italy., Suranna GP; Dipartimento di Ingegneria Civile, Ambientale, del Territorio, Edile e di Chimica (DICATECh), Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy; CNR NANOTEC - Istituto di Nanotecnologia, Via Monteroni, 73100 Lecce, Italy., Grisorio R; Dipartimento di Ingegneria Civile, Ambientale, del Territorio, Edile e di Chimica (DICATECh), Politecnico di Bari, Via Orabona 4, 70125 Bari, Italy; CNR NANOTEC - Istituto di Nanotecnologia, Via Monteroni, 73100 Lecce, Italy., Spiers KM; Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany., Falkenberg G; Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany., Terzano R; Department of Soil, Plant and Food Sciences, University of Bari 'Aldo Moro', Via G. Amendola 165/A, 70126 Bari, Italy. Electronic address: roberto.terzano@uniba.it.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2022 Aug 15; Vol. 436, pp. 129117. Date of Electronic Publication: 2022 May 11.
DOI: 10.1016/j.jhazmat.2022.129117
Abstrakt: Controlled or accidental fires can impact agricultural soils amended with composted organic materials since high temperatures cause fast organic matter (OM) mineralization and soil properties modifications. During these events, potentially toxic elements (PTEs) associated with OM can be released and change their distribution and speciation thus becoming a threat to the environment and to crops. In this study, we investigated the changes of distribution and speciation of chromium in soils long-term amended with compost obtained from tannery sludges, after simulating fires of different intensity (300, 400 and 500 °C) likely to occur on agricultural soils. A combination of conventional soil chemical analyses and bulk and (sub)micro X-ray analyses allowed the observation of the formation of hexavalent chromium and changes of chromium speciation. Specifically, a strong decrease of Cr-OM associations was found with increasing temperature in favour of Cr-iron (hydr)oxides interactions and CaCrO 4 formation. These data provide first evidence that fires can transform OM-stabilized Cr into more mobile, available and toxic Cr-forms potentially accessible for plant uptake, thus posing a risk for the food chain and the environment.
(Copyright © 2022 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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